Determination of water vapour transmission rate for plastic film and sheeting - Electrolytic detection sensor method
Some standard content:
1CS 55. 020
National Standard of the People's Republic of China
GB/T21529--2008
Determination of water vapour transmission rate for plastic film and sheeting-Electrolytic detection sensor method(IS0 15106-3:2003,Plastics Film and sheeting-Determinationof water vapour transmission rate-Part 3:Electrolytic detection sensor tnethod, MOD) Issued on April 1, 2008
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Standardization Administration of China
Implementation on October 1, 2008
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GB/T21529—2008
This standard adopts IS015106-3:2003≤Test method for water vapor transmission rate of plastic film and sheeting Part 3: Electrolytic sensor test method\ (English version).
This standard is redrafted based on ISO15106-3:2003. Appendix D lists the comparison table between the chapter and article numbers of this standard and the chapter and case numbers of ISO15106-3:2003. Taking into account my country's national conditions, this standard has made some modifications when adopting IS015106-3:2003. The relevant technical differences have been compiled into the text and marked with a vertical single line in the margin of the clauses they involve. A list of these technical differences and their causes is given in Appendix E for reference.
Compared with the 15015106-3:2003 standard, the main differences between this standard and the 15015106-3:2003 standard are as follows: - Added clauses 7.2.4 to 7.2.7, which respectively explain the porous disk, temperature device, electrolytic cell, and reversing device; - Added clause 7.3 to calibrate the equipment with a standard membrane, in order to make the test data of this standard comparable with the data of other test method standards:
In test step 9.7, the judgment condition for the current to reach a constant value, that is, the water vapor permeation to reach a stable state, is specified: In Chapter 11 Test Results, the deviation of each sample test value from the sample arithmetic mean is specified; : Deleted Chapter 12 of IS015106-3:2003, and added Appendix B. Appendix B adopts the data on relative humidity that can be achieved by saturated aqueous solutions of different salts provided in ASTM E104:2002 "Standard method for maintaining constant relative humidity using permanent solutions" and DIN 53122.2:1982 "Electrolytic method for determining the water vapor permeability of plastic film, rubber, paper, paperboard and other sheets": Appendix C is added. Appendix C refers to the derivation process of the instrument band number (8.067) in DIV 63122.2:1982 to derive the instrument constant.
Appendix A and Appendix B of this standard are normative appendices, and Appendix C, Appendix D and Appendix E are informative appendices. This standard consists of Proposed and coordinated by the National Technical Committee for Packaging Standardization. Drafting units of this standard: China Packaging Research and Testing Center, National Packaging Product Quality Supervision and Inspection Center (Jinan), Jinan Languang Electromechanical Technology Co., Ltd.
Main drafters of this standard: Wang Xingdong, Zhou Jiayi, Niu Shumei, Han Suoshan, Cong Lin, Zhao Jiang, Zhang Rixiao, Jiang Yunzhong. 1 Scope
Determination of water vapor transmission rate of plastic film and sheet
Electrolytic sensor method
This standard specifies the test method for determining water vapor transmission rate using electrolytic sensor. GB/T21529—2008
This standard is applicable to the rapid determination of plastic Water vapor transmission rate of plastic films, sheets and multi-layer structural materials containing plastics. 2 Normative references
The clauses in the following documents become clauses of this standard through reference in this standard. For any referenced document with an H date, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties that reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, its latest version applies to this standard. GB/T1037-1988 Test method for water vapor permeability of plastic film and sheeting - Cup method GB/16672 Plastic film and sheeting - Test method for water vapor permeability of plastic film and sheeting - Cup method Thickness determination of sheet: Mechanical blue measurement method (GB/T6672:2001, idtISO4503:1093) 3 Terms and definitions
The following terms and definitions apply to this standard. 3.1
water vapor transmission rate, wyTR water vapor transmission rate
The amount of water vapor that passes through a sample per unit area per unit time under specific conditions. Note: The definition of water vapor transmission rate in this standard is consistent with the definition of water vapor transmission rate in GB/T10371988. The unit of water vapor transmission rate (amount) is gram per square meter for 24 hours g/(m·24 h). 4 Principle
After the sample is clamped into the permeation chamber, the sample divides the permeation chamber into an upper chamber and a wet chamber (humidity is adjustable). A dry carrier gas flows through the lower chamber, and the water vapor that passes through the sample from the wet chamber is carried by the carrier gas to the electrolytic cell. The structure of the electrolytic cell is as follows: there are two spiral metal electrodes inside, the electrodes are installed on the inner wall of the glass capillary, and a thin layer of phosphorus pentoxide is coated on the surface of the electrode. The carrier gas passes through the glass capillary, and the water vapor carried by the carrier gas is quantitatively absorbed by the phosphorus pentoxide. By applying a certain DC voltage to the electrode, the water vapor is electrolyzed into hydrogen and oxygen. According to the value of the electrolysis current, the water vapor volume that passes through the unit area of the sample per unit time is calculated. 5 Samples
5.1 The sample should be representative, with uniform thickness and no creases, wrinkles, or pinholes. The area of the sample should be larger than the permeation area of the permeation chamber, and the sample should be well packaged.
5. 2 At least three samples should be tested for water vapor permeation rate. 5.3 The thickness shall be measured in accordance with the provisions of GB/T6672, and at least 3 points of each sample shall be measured at equal intervals. 6 Conditioning of sample state
The sample state shall be conditioned at a temperature of 23℃±2°C and a relative humidity of 50%±10% for at least 4 hours. 1
7.2.7 Reversal
The gas flow direction can be regulated during the reversal. 7.3 Standard film
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GB/121529—2008
The equipment shall be calibrated using a standard film. The standard film may be a film with a known water vapor permeability or a film with a water vapor permeability obtained by a gravimetric method test.
8 Test conditions
The test conditions shall be selected from Table 1 first. Other test conditions shall be agreed upon by all parties concerned. Table 1 Test conditions
9 Test steps
Temperature/
38 ± 0.5
Relative humidity/%
9.1 Place a porous disk containing a medium such as a sulfuric acid solution or distilled water or a saturated salt solution of appropriate concentration into the cavity of the permeation chamber to form a constant humidity environment.
9.2 The relationship between relative humidity and sulfuric acid solution concentration is shown in Appendix A. The relationship between relative humidity and saturated salt solution is shown in Appendix B. A 100% relative humidity environment can be produced by using distilled water. 9.3 Place the sample below the permeation chamber and above the wet chamber (see Figure 1), close and seal the permeation chamber, 9.4 Adjust the reversing valve to a suitable position so that the sample passes through the dry chamber to the dry chamber and bypasses the electrolytic cell (through the AB path in Figure 1) to directly enter the atmosphere: this can prevent the moisture that enters the dry chamber during the sample loading process from being brought into the electrolytic cell, thereby causing the electrolytic cell to be damp and the mechanical test results to be invalid.
9.5 Apply a certain true current voltage to the electrolytic cell. Keep the electrolytic cell in the working state unless it is not used for a long time. 9.6 After about 30 minutes, adjust the reversing valve to the test position to allow the carrier gas (through the C-B path in Figure 1) to pass through the electrolytic cell. 9.7 Measure the change in electrolytic current at a certain time interval. When the fluctuation range of the three adjacent current sampling values is no more than 5%, it can be considered that the current has remained constant and the water vapor permeation has reached a stable state. Record the current value. 10 Calculation
Calculate the water vapor permeability of each sample according to formula (1). WVTR = 8. 067 ×
Where:
The water vapor permeability of the sample,The unit is gram per square meter per 24 hours [g/ (m224 h)]; the avoidance area of the sample, the unit is square meter () electrolytic current, the unit is ampere (A) #
instrument band number, the unit is gram per ampere per 24 hours [.g/(A· 24 h)1 (see Appendix C for the derivation process). 1)
GB/T21529—2008
7.1 Structure only
The instrument consists of a permeation chamber, an electrolytic cell, a flow control valve, a drying tube, a reversing valve, etc. The sample is clamped between the two chambers of the permeation chamber. The electrolytic cell is used to measure the water vapor permeability. The drying tube is filled with a desiccant, such as a molecular sieve material. The instrument structure is shown in Figure 1. 1··Flow regulating valve 1
2-Drying tube
3 Permeation chamber:
4-Sample;
7.2 Components
7.2.1 Flow regulating valve
5-Porous disk
6 Temperature control device:
7 Electrolytic cell
8-Reversing chamber.
Figure 1 Schematic diagram of the structure of the electrolytic sensor method water vapor permeability test instrument. The flow rate of the carrier gas (nitrogen) gas flow can be adjusted through the flow regulating valve, and the flow rate is read out by the flow meter. The flow rate measurement range of the flow meter is 5 mL/min20o ml/min,
7.2.2 Drying tube
The tube is filled with a desiccant, such as a molecular sieve material. The carrier gas can be dried to the detection limit of the electrolytic cell, or dried to a level lower than the detection limit of the electrolytic cell.
7.2.3 Permeation chamber
The permeation chamber is composed of a dry chamber and a wet chamber, with the sample clamped between the two chambers. The permeation area is between 5cm and 100ctm. The water vapor concentration in the dry chamber is low and is continuously purged by the carrier gas flow; the water vapor concentration in the wet chamber is high. The temperature of the permeation chamber is regulated by a temperature control device. 7.2.4 Porous disk
Made of glass fiber or porous ceramic, it is used to hold media such as sulfuric acid solution, water or saturated salt solution to form a constant optical density ring. The porous disk cannot react with the media that can be placed. 7.2.5 Temperature control device
The permeation chamber is used to adjust the temperature. The temperature of the permeation chamber should be controlled within the range of ±0.5℃ of the test temperature. 7.2.6 Electrolytic cell
It is made based on the principle of electrolysis and can quantitatively measure the water vapor carried in the carrier gas. It is also called electrolytic water vapor sensor. 2
GB/T21529—2008
11 Test results
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The test results are expressed as the arithmetic mean of three or more samples. When the value is less than 1, the result is retained to 2 decimal places. When the value is greater than 1, the result is retained to 1 decimal place. The deviation between the test value of each sample and the arithmetic mean shall not exceed 10%. 12
Test report
The test report shall include the following information:
Test basis;
Name of test instrument;
Test parts:
Detailed description necessary for identification of test sample: Preparation of sample;
Surface of sample exposed to water vapor;
Permeability of sample;
Average thickness of sample:
Number of samples tested;
Detailed description of sample status
Test results;
Test date.
Temperature/℃
Appendix A
(Normative record)
Relationship between relative humidity and concentration of sulfuric acid solution Table A.1
Relationship between relative humidity and concentration of sulfuric acid solution Relative humidity/%
Concentration of sulfuric acid solution (by mass)/%
48, 9
GB/T21529—2008
B.1 Relative humidity of different saturated brine solutions (5℃~80℃) Appendix B
(Normative record)
Relative humidity of saturated brine solutions
Table B.1 gives the relationship between the relative humidity of different salt solutions at 5℃~80℃. Table B.1 Relative humidity of different saturated salt solutions (5°C～80°C) °C
Cetyl fluoride
1. 3±1.4
3. 8±1, 1
2. 7+0, 7
2. 1±0. 6
2.1±0. 4
2. 0±0. 4
2, 1±0. 5
2.2±0. 6
2. 410. 7
2. 6±0. 8
Lithium bromide
7. 1±0. 7
6. 9±0. 7
6. 6±0, 6
6. 2±0. 5
6,00.5
5. 8± 0. 4
5. 7±0. 4
5. 5±0. 4
5. 4±0, 3
5. 3 3(11.2—14.0)
1311. 3—14. 3)
1211.3:-13.8)
12(11. 1-12. 6)
11.3±0.3
11.3±0.3
11,3±0, 3
11.2±0.3
11, 2+0, 3
11. 1±0. 3
11,0±0.3
11,0±0.3
10.9 10.3
10.5±0. 5
Potassium acetate
23. 41 0.6
23. 4±0. 4
23. 1+0, 3
22. 5±0. 4
21.6±0.6
Relative humidity of aqueous solution of aldehyde/head
Magnesium chloride
33. 6+0, 3
33. 5±0. 3
33. 3±0. 3
33.1±0.2
32. . 2
29, 3 1 0. 2
28.5±0.3
27.8±0.3
26.1±0.4
carbon waist
43, 1+0, 5
43.1±0. 4
13.2±0. 4
43,2+0,5
63.5±0.8
62.2±0. 6
59.110. 5
57. 6±n. 4
66.0±0. 4
54. 610. 4
53. 2+0, 5
52.010. 5
50.9±0,6
50.2±0.7
49.7±0, 8
49.5±1.0
49.7±1.1
50.3±1.3
51. 4+ 1. 5
Potassium iodide
73. 3 ± c. 4
72.1±0. 4
71.0±0.3
69.9±0.3
67.9±0.3
67. 0±0. 8±0. 3
63. 1±0. 4
62.5±1. 4
61.9±0.3
61,4±0.5
61, 0+a. 5
Sodium chloride
75.7 t 0. 3
75.7±0. 3
75. 6 ± 0. 2
75.1±0.2
74. 9±0. 2
74,7±0,2
74.5±0.2
74, 5±0,9
74.5±0.0
74.4±0.0||t t||74.2±0.9
74,1±0, 9
74.0±0.9
73. 9+0, 9
potassium chloride
87.7±0.5
86. 8±0, 4
85.9:10. 4
85.1±0.3
84.2±0.3
83.6±0.3
83. 0±0. 3
82. 3 ± 0. 3| |tt||81. 7±0. 3
81, 2±0. 4
80. 7 ±0. 4
80.3±0. 5
79. 9..d, 6
79. 5±.0, 6
79,2±0, 7
78.9±0. 8
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GB/T 21529—-2008
Potassium sulfate|| tt||98. 5±1. 0
98.2±0.8
97.9±0.7
97. 6±0, 6
97. 3±0. 5
97.0±0.4
96, 7±0, 4
96. 4 ±0. 4
96,1±0. 4
95 , 8 1 0. 5
B.2 Relative humidity of different saturated salt solutions (20℃～40℃) Table B.2 gives the relative humidity relationship of different saturated salt solutions at 20℃~10℃. B.2 Relative humidity of different saturated salt solutions (20 ℃ ~ 40 ℃) Relative humidity/%
Potassium sulfate
(K,SO )
Chromium sulfate heptahydrate
(ZnSO, + 7H,0)
Potassium oxide
Sodium chloride
(NaCI)||tt| |Scalyte nitrate
(NaNO,)
Sodium nitrite
-sodium dichromate hydrate
(Na Gt) - 2H,0)
Sodium hydrate
(NBr - 2H,O)
Magnesium oxide hexahydrate
(MgClz -6H,0)
GB/T 215292008
CB/T21529—2008
C.1 The calculation of water vapor transmission rate is shown in formula (C.1): Where
Appendix C
(Informative Appendix)
Derivation of instrument constants
WVIR=AXT
TTKAONIKACa
WVTR-water vapor transmission rate of the sample, in grams per square meter per 24 hours Lg/m2·21h)]: The amount of water vapor that passes through the sample at m
T, in grams () A——The permeability of the sample, in square meters (m) The penetration time is 24h.
C.2 The mass of water vapor that permeates the sample is calculated as shown in formula (C.2): According to Faraday's law of electrolysis
1Xt×M(tH0)
Where:| |tt||m-the mass of water vapor that permeates through the sample, in grams (g); M(H,O)
water vapor gram equivalent 9.01K/mal;
electrolysis current, The unit is ampere (A),
electrolysis current duration, the unit is second (s); Ixt
Faraday constant (96500), the unit is voltaic second per mole [(A·8)/ mal]. According to the time unit of water vapor transmission rate is 24h, that is, T=1; then calculate the water vapor transmission rate in the same time unit, t=24h-86400% in Faraday's law of electrolysis. Therefore: [X×M(0)×A×T
WVTR =
9.01×86400×yuan
C.3 Instrument constant:
= 8,067 The 8.067 in the formula X
is the instrument band number, and the unit is g/(A·24 h). Note: This is derived with reference to DIN 53122.2:1982. M(u)××
Appendix D
(Informative Appendix)
The chapter and clause numbers of this standard correspond to those of 1S0 15106-3:2003. Table D.1| |tt||Comparison of chapter and clause numbers of this standard with those of ISD15106-3:2003 (E) Chapter and clause numbers of this standard
7, 2, 2
7. 2. 4~7. 3
Appendix A
Appendix B
Appendix Core
Appendix D
Appendix E
GB/T21529—200B
Corresponding international standard chapter number
10--11
Appendix A
GB/T 21529-2008
Appendix E
(Informative Appendix)
Technical differences between this standard and ISU 15106-3:2003 and their causes TIKAONIKACa
Table E.1 List of technical differences between this standard and IS015106-3:2003 and their causes
Chapter number of this standard
7. 2. 4~-7, 2. 7
Appendix B| |tt||Appendix C
Technical Differences
Incorporate the notes in the original international standard into the main text. Use the Chinese standard that adopts the international standard instead of the international standard. The content of the note adds the GB /T1037-1988. The DC voltage of about 70 V is changed to a certain DC voltage. The adjustment time is specified to be at least 4 h. The flowmeter range is 5 ml./min ~ [00 mL./min, and the adjustment range is 5 mL/min~20C mL/min. The area 2 crn=-100 cm was adjusted to 5 cm~100 cm, and 4 items were added to explain the components of the guest hole plate temperature control device, electrolytic cell, and reversing valve.
Added the requirement of using standard membrane to calibrate equipment, deleted international standard 9.1, changed international standard 9.2 to 9.1, listed the international standard 9.2 note as 9.2 series, and introduced an appendix B, added that when the passive amplitude of the three consecutive current sampling values is not greater than 5, it can be considered that the current has remained constant, and added the requirement that the test deviation shall not exceed ±10%, in addition to the 12 Accuracy clause, add normative appendix date saturated water solution of different salts can achieve the relative sensitivity data, add informative appendix death instrument constant derivation. Original
According to GB, T The provisions of 1.1 standardize the standard terms to suit my country's national conditions.
Instructions for consistency with the meaning of the national standard definition. The 70V limit has the same limit.
The corresponding national standard stipulates the specific leaf spacing,
It is more in line with the actual usage. || tt||More in line with the actual use of the situation, does not affect the test results.
All the optical components involved in Tao 1 are explained, which is more clear and complete.
Other test methods are standard The data is comparable. Clause 9.1 has no actual content. The content is better connected. It is more operational. The uncertain description is less suitable for the writing of national standards. The method of achieving relative sensitivity makes the standard more operational.
The origin of the instrument constant is clearer.8
97.9±0.7
97. 6±0, 6
97. 3±0. 5
97.0±0.4
96, 7±0, 4
96. 4 ±0. 4
96,1±0. 4
95, 8 1 0. 5
B.2 Relative humidity of different saturated brine solutions (20℃～40℃) Table B. 2 gives the relationship between the relative humidity of different saturated brine solutions at 20℃ ~10℃. B.2 Relative humidity of different saturated salt solutions (20℃～40℃) Relative humidity/%
Salt water and salt solution
Potassium sulfate
(K,SO)
Chromium sulfate heptahydrate
(ZnSO, + 7H,0)
Potassium oxide
Sodium chloride
(NaCI)
Nitrate
(NaNO,)
Sodium nitrite
Sodium dichromate monohydrate
(Na Br - 2H,0)
Sodium hydroxide
(NBr - 2H,O)
Magnesium oxide hexahydrate
|(MgCl2 -6H,0)
GB/T 215292008
CB/T21529—2008Www.bzxZ.net
C.1 The water vapor transmission rate is calculated by formula (C.1): In the formula
Appendix C
(Informative Appendix)
Derivation of instrument constant
WVIR=AXT
TTKAONIKACa
WVTR-water vapor transmission rate of the sample, in grams per square meter per 24 hours (Lg/m2·21h)]: m
The amount of water vapor that passes through the sample at T time, in grams () A-the transmission area of the sample, in square meters (m) The transmission time is 24h.
C.2 The mass of water vapor that permeates the sample is calculated as shown in formula (C.2): According to Faraday's law of electrolysis
1Xt×M(tH0)
Wherein:
m-the mass of water vapor that permeates the sample, in grams (g); M(H,O)
water vapor gram equivalent 9.01K/mal;
electrolysis current, in amperes (A);
electrolysis current duration, in seconds (s); Ixt
Faraday constant (96500), in voltaic seconds per mole [(A·8)/mal]. According to the time unit of water vapor transmission rate is 24h, that is, T=1; then calculate the water vapor transmission rate in the same time unit, t=24h in Faraday's law of electrolysis-86400%. Therefore: [X×M(0)×A×T
WVTR =
9.01×86400×yuan
C.3 Instrument constant:
= 8,067 X
The 8.067 in the formula is the instrument band number, the unit is g/(A·24 h). Note: Derived with reference to DIN 53122.2:1982 standard. M(u)××
Appendix D
(Informative Appendix)
Corresponding clause numbers of this standard and ISD15106-3:2003 Table D.1
Corresponding clause numbers of this standard and ISD15106-3:2003 (E) Clause numbers of this standard
7, 2, 2
7. 2. 4~7. 3
Appendix A
Appendix B
Appendix C
Appendix D
Appendix E
GB/T21529—200B
Corresponding clause numbers of international standards
10--11
Appendix A
GB/T 21529-2008
Appendix E
(Informative Appendix)
Technical differences between this standard and ISO 15106-3:2003 and their causesTIKAONIKACa
Table E.1 Technical differences between this standard and ISO 15106-3:2003 and their causesList of technical differences between this standard and ISO 15106-3:2003
Chapter number of this standard
7. 2. 4~-7, 2. 7
Appendix B
Appendix C
Technical differences
Incorporate the notes in the original international standard into the text. Use the Chinese standard that adopts the international standard instead of the international standard. Add the explanation with GB/T1037-1988 to the content of the note. Change the DC voltage of about 70 V to a certain DC voltage. It is specifically stipulated that the adjustment time should be at least 4 h.
the range of the flowmeter is 5 ml./min ~ [00 mL./min, adjusted to 5 mL/min~20C mL/min
the permeation area is 2 crn=-100 cm, adjusted to 5 cm ~100 cm, and 4 clauses are added, which respectively explain the components of the perforated plate temperature control device, the electrolytic cell, and the reversing valve.
Added the requirement of using standard membrane to calibrate equipment, deleted the international standard 9.1, changed the international standard 9.2 to 9.1, listed the international standard 9.2 note as 9.2 series, and introduced Appendix B, added the requirement that the current can be considered to be constant when the amplitude of the three consecutive current sampling values is not greater than 5,
Added the requirement that the test deviation shall not exceed ±10%, deleted the 12th accuracy clause in the international standard, added the normative appendix data on the relative sensitivity that can be achieved by saturated water solutions of different salts,
Added the information appendix on the derivation of instrument constants. Original
Standard terms are standardized according to the provisions of GB,T 1.1 to suit my country's national conditions.
The description is consistent with the meaning of the national standard definition. The 70V limit is limited. The corresponding national standard stipulates specific intervals, which is more in line with the actual use situation and does not affect the test results.
The optical components involved in Tao 1 are fully described, which is clearer and more complete. The data of other test methods and standards are comparable. Clause 9.1 has no actual content. The content connection is better.
More operational.
The uncertain description is less suitable for the writing of the national standard. It provides methods to achieve relative sensitivity through different channels, making the standard more operational.
The origin of the instrument constant is clearer.8
97.9±0.7
97. 6±0, 6
97. 3±0. 5
97.0±0.4
96, 7±0, 4
96. 4 ±0. 4
96,1±0. 4
95, 8 1 0. 5
B.2 Relative humidity of different saturated brine solutions (20℃～40℃) Table B. 2 gives the relationship between the relative humidity of different saturated brine solutions at 20℃ ~10℃. B.2 Relative humidity of different saturated salt solutions (20℃～40℃) Relative humidity/%
Salt water and salt solution
Potassium sulfate
(K,SO)
Chromium sulfate heptahydrate
(ZnSO, + 7H,0)
Potassium oxide
Sodium chloride
(NaCI)
Nitrate
(NaNO,)
Sodium nitrite
Sodium dichromate monohydrate
(Na Br - 2H,0)
Sodium hydroxide
(NBr - 2H,O)
Magnesium oxide hexahydrate
|(MgCl2 -6H,0)
GB/T 215292008
CB/T21529—2008
C.1 The water vapor transmission rate is calculated by formula (C.1): In the formula
Appendix C
(Informative Appendix)
Derivation of instrument constant
WVIR=AXT
TTKAONIKACa
WVTR-water vapor transmission rate of the sample, in grams per square meter per 24 hours (Lg/m2·21h)]: m
The amount of water vapor that passes through the sample at T time, in grams () A-the transmission area of the sample, in square meters (m) The transmission time is 24h.
C.2 The mass of water vapor that permeates the sample is calculated as shown in formula (C.2): According to Faraday's law of electrolysis
1Xt×M(tH0)
Wherein:
m-the mass of water vapor that permeates the sample, in grams (g); M(H,O)
water vapor gram equivalent 9.01K/mal;
electrolysis current, in amperes (A);
electrolysis current duration, in seconds (s); Ixt
Faraday constant (96500), in voltaic seconds per mole [(A·8)/mal]. According to the time unit of water vapor transmission rate is 24h, that is, T=1; then calculate the water vapor transmission rate in the same time unit, t=24h in Faraday's law of electrolysis-86400%. Therefore: [X×M(0)×A×T
WVTR =
9.01×86400×yuan
C.3 Instrument constant:
= 8,067 X
The 8.067 in the formula is the instrument band number, the unit is g/(A·24 h). Note: Derived with reference to DIN 53122.2:1982 standard. M(u)××
Appendix D
(Informative Appendix)
Corresponding clause numbers of this standard and ISD15106-3:2003 Table D.1
Corresponding clause numbers of this standard and ISD15106-3:2003 (E) Clause numbers of this standard
7, 2, 2
7. 2. 4~7. 3
Appendix A
Appendix B
Appendix C
Appendix D
Appendix E
GB/T21529—200B
Corresponding clause numbers of international standards
10--11
Appendix A
GB/T 21529-2008
Appendix E
(Informative Appendix)
Technical differences between this standard and ISO 15106-3:2003 and their causesTIKAONIKACa
Table E.1 Technical differences between this standard and ISO 15106-3:2003 and their causesList of technical differences between this standard and ISO 15106-3:2003
Chapter number of this standard
7. 2. 4~-7, 2. 7
Appendix B
Appendix C
Technical differences
Incorporate the notes in the original international standard into the text. Use the Chinese standard that adopts the international standard instead of the international standard. Add the explanation with GB/T1037-1988 to the content of the note. Change the DC voltage of about 70 V to a certain DC voltage. It is specifically stipulated that the adjustment time should be at least 4 h.
the range of the flowmeter is 5 ml./min ~ [00 mL./min, adjusted to 5 mL/min~20C mL/min
the permeation area is 2 crn=-100 cm, adjusted to 5 cm ~100 cm, and 4 clauses are added, which respectively explain the components of the perforated plate temperature control device, the electrolytic cell, and the reversing valve.
Added the requirement of using standard membrane to calibrate equipment, deleted the international standard 9.1, changed the international standard 9.2 to 9.1, listed the international standard 9.2 note as 9.2 series, and introduced Appendix B, added the requirement that the current can be considered to be constant when the amplitude of the three consecutive current sampling values is not greater than 5,
Added the requirement that the test deviation shall not exceed ±10%, deleted the 12th accuracy clause in the international standard, added the normative appendix data on the relative sensitivity that can be achieved by saturated water solutions of different salts,
Added the information appendix on the derivation of instrument constants. Original
Standard terms are standardized according to the provisions of GB,T 1.1 to suit my country's national conditions.
The description is consistent with the meaning of the national standard definition. The 70V limit is limited. The corresponding national standard stipulates specific intervals, which is more in line with the actual use situation and does not affect the test results.
The optical components involved in Tao 1 are fully described, which is clearer and more complete. The data of other test methods and standards are comparable. Clause 9.1 has no actual content. The content connection is better.
More operational.
The uncertain description is less suitable for the writing of the national standard. It provides methods to achieve relative sensitivity through different channels, making the standard more operational.
The origin of the instrument constant is clearer.2 The mass of water vapor that permeates the sample is calculated as shown in formula (C.2): According to Faraday's law of electrolysis
1Xt×M(tH0)
Wherein:
m-the mass of water vapor that permeates the sample, in grams (g); M(H,O)
water vapor gram equivalent 9.01K/mal;
electrolysis current, in amperes (A);
electrolysis current duration, in seconds (s); Ixt
Faraday constant (96500), in voltaic seconds per mole [(A·8)/mal]. According to the time unit of water vapor transmission rate is 24h, that is, T=1; then calculate the water vapor transmission rate in the same time unit, t=24h-86400% in Faraday's law of electrolysis. Therefore: [X×M(0)×A×T
WVTR =
9.01×86400×yuan
C.3 Instrument constant:
= 8,067 X
The 8.067 in the formula is the instrument band number, the unit is g/(A·24 h). Note: Derived with reference to DIN 53122.2:1982 standard. M(u)××
Appendix D
(Informative Appendix)
Corresponding clause numbers of this standard and ISD15106-3:2003 Table D.1
Corresponding clause numbers of this standard and ISD15106-3:2003 (E) Clause numbers of this standard
7, 2, 2
7. 2. 4~7. 3
Appendix A
Appendix B
Appendix C
Appendix D
Appendix E
GB/T21529—200B
Corresponding clause numbers of international standards
10--11
Appendix A
GB/T 21529-2008
Appendix E
(Informative Appendix)
Technical differences between this standard and ISO 15106-3:2003 and their causesTIKAONIKACa
Table E.1 Technical differences between this standard and ISO 15106-3:2003 and their causesList of technical differences between this standard and ISO 15106-3:2003
Chapter number of this standard
7. 2. 4~-7, 2. 7
Appendix B
Appendix C
Technical differences
Incorporate the notes in the original international standard into the text. Use the Chinese standard that adopts the international standard instead of the international standard. Add the explanation with GB/T1037-1988 to the content of the note. Change the DC voltage of about 70 V to a certain DC voltage. It is specifically stipulated that the adjustment time should be at least 4 h.
the range of the flowmeter is 5 ml./min ~ [00 mL./min, adjusted to 5 mL/min~20C mL/min
the permeation area is 2 crn=-100 cm, adjusted to 5 cm ~100 cm, and 4 clauses are added, which respectively explain the components of the perforated plate temperature control device, the electrolytic cell, and the reversing valve.
Added the requirement of using standard membrane to calibrate equipment, deleted the international standard 9.1, changed the international standard 9.2 to 9.1, listed the international standard 9.2 note as 9.2 series, and introduced Appendix B, added the requirement that the current can be considered to be constant when the amplitude of the three consecutive current sampling values is not greater than 5,
Added the requirement that the test deviation shall not exceed ±10%, deleted the 12th accuracy clause in the international standard, added the normative appendix data on the relative sensitivity that can be achieved by saturated water solutions of different salts,
Added the information appendix on the derivation of instrument constants. Original
Standard terms are standardized according to the provisions of GB,T 1.1 to suit my country's national conditions.
The description is consistent with the meaning of the national standard definition. The 70V limit is limited. The corresponding national standard stipulates specific intervals, which is more in line with the actual use situation and does not affect the test results.
The optical components involved in Tao 1 are fully described, which is clearer and more complete. The data of other test methods and standards are comparable. Clause 9.1 has no actual content. The content connection is better.
More operational.
The uncertain description is less suitable for the writing of the national standard. It provides methods to achieve relative sensitivity through different channels, making the standard more operational.
The origin of the instrument constant is clearer.2 The mass of water vapor that permeates the sample is calculated as shown in formula (C.2): According to Faraday's law of electrolysis
1Xt×M(tH0)
Wherein:
m-the mass of water vapor that permeates the sample, in grams (g); M(H,O)
water vapor gram equivalent 9.01K/mal;
electrolysis current, in amperes (A);
electrolysis current duration, in seconds (s); Ixt
Faraday constant (96500), in voltaic seconds per mole [(A·8)/mal]. According to the time unit of water vapor transmission rate is 24h, that is, T=1; then calculate the water vapor transmission rate in the same time unit, t=24h-86400% in Faraday's law of electrolysis. Therefore: [X×M(0)×A×T
WVTR =
9.01×86400×yuan
C.3 Instrument constant:
= 8,067 X
The 8.067 in the formula is the instrument band number, the unit is g/(A·24 h). Note: Derived with reference to DIN 53122.2:1982 standard. M(u)××
Appendix D
(Informative Appendix)
Corresponding clause numbers of this standard and ISD15106-3:2003 Table D.1
Corresponding clause numbers of this standard and ISD15106-3:2003 (E) Clause numbers of this standard
7, 2, 2
7. 2. 4~7. 3
Appendix A
Appendix B
Appendix C
Appendix D
Appendix E
GB/T21529—200B
Corresponding clause numbers of international standards
10--11
Appendix A
GB/T 21529-2008
Appendix E
(Informative Appendix)
Technical differences between this standard and ISO 15106-3:2003 and their causesTIKAONIKACa
Table E.1 Technical differences between this standard and ISO 15106-3:2003 and their causesList of technical differences between this standard and ISO 15106-3:2003
Chapter number of this standard
7. 2. 4~-7, 2. 7
Appendix B
Appendix C
Technical differences
Incorporate the notes in the original international standard into the text. Use the Chinese standard that adopts the international standard instead of the international standard. Add the explanation with GB/T1037-1988 to the content of the note. Change the DC voltage of about 70 V to a certain DC voltage. It is specifically stipulated that the adjustment time should be at least 4 h.
the range of the flowmeter is 5 ml./min ~ [00 mL./min, adjusted to 5 mL/min~20C mL/min
the permeation area is 2 crn=-100 cm, adjusted to 5 cm ~100 cm, and 4 clauses are added, which respectively explain the components of the perforated plate temperature control device, the electrolytic cell, and the reversing valve.
Added the requirement of using standard membrane to calibrate equipment, deleted the international standard 9.1, changed the international standard 9.2 to 9.1, listed the international standard 9.2 note as 9.2 series, and introduced Appendix B, added the requirement that the current can be considered to be constant when the amplitude of the three consecutive current sampling values is not greater than 5,
Added the requirement that the test deviation shall not exceed ±10%, deleted the 12th accuracy clause in the international standard, added the normative appendix data on the relative sensitivity that can be achieved by saturated water solutions of different salts,
Added the information appendix on the derivation of instrument constants. Original
Standard terms are standardized according to the provisions of GB,T 1.1 to suit my country's national conditions.
The description is consistent with the meaning of the national standard definition. The 70V limit is limited. The corresponding national standard stipulates specific intervals, which is more in line with the actual use situation and does not affect the test results.
The optical components involved in Tao 1 are fully described, which is clearer and more complete. The data of other test methods and standards are comparable. Clause 9.1 has no actual content. The content connection is better.
More operational.
The uncertain description is less suitable for the writing of the national standard. It provides methods to achieve relative sensitivity through different channels, making the standard more operational.
The origin of the instrument constant is clearer.
More in line with the actual use,
More in line with the actual use, does not affect the test results.
All the optical components involved in Tao 1 are explained, which is clearer and more complete.
The data of other test methods and standards are comparable. 9.1 clause has no actual content.
The content connection is better.
More operational.
The uncertain description is less suitable for the writing of the national standard. It provides methods to achieve relative sensitivity through different channels, making the standard more operational.
The origin of the instrument constant is clearer.
More in line with the actual use,
More in line with the actual use, does not affect the test results.
All the optical components involved in Tao 1 are explained, which is clearer and more complete.
The data of other test methods and standards are comparable. 9.1 clause has no actual content.
The content connection is better.
More operational.
The uncertain description is less suitable for the writing of the national standard. It provides methods to achieve relative sensitivity through different channels, making the standard more operational.
The origin of the instrument constant is clearer.
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