Some standard content:
GB/T4454—1996
This standard is formulated by adopting the Japanese Industrial Standard JISK6745-1995 "Rigid Polyvinyl Chloride Sheet" in a non-equivalent manner. The main indicators of this standard, such as product classification, appearance requirements, allowable deviation of nominal dimensions and performance, adopt the JIS standard. The main difference between this standard and the original GB4454-84 standard is that this standard is divided into two categories according to product use: industrial use and general use, and the products are classified and graded. The dimensional tolerance of the product is changed to the limit deviation, and the thickness limit deviation is assessed by percentage to make it serialized. In terms of performance, the Vicat softening point test is changed to the heat deformation temperature test, and the combustion performance test and two corrosive media, 10% sodium chloride and water, are added. The bending strength test is cancelled, and the scope of use of polyvinyl chloride sheets is expanded. This standard will replace GB4454-84 from the date of entry into force. This standard is proposed by the China Light Industry Federation.
This standard is under the jurisdiction of the National Technical Committee for Standardization of Plastic Products. The responsible drafting units of this standard are: Changzhou Qinye Plastic Factory, Shanghai Shuanghua Plastic Co., Ltd., Guangzhou Plastic Products Factory No. 3. The main drafters of this standard are: Wu Xunmao, Hua Zhiming, Yu Meiling, Lao Muzhen. 233
National Standard of the People's Republic of China
Rigid polyvinyl chloride laminated plates
Rigid polyvinyl chloride laminated platesGB/T 4454-1996
Replaces GB4454-84
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of rigid polyvinyl chloride laminated plates (hereinafter referred to as plates).
This standard is applicable to plates made of polyvinyl chloride resin as the main raw material, stabilizers and other additives added, calendered into thin sheets, and then laminated.
2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of this standard, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB1033-86 Test method for density and relative density of plastics GB1039-92 Test method for mechanical properties of plastics General GB1040-92 Test method for tensile properties of plastics GB104393 Test method for impact of simply supported beam of rigid plastics GB1634-79 Test method for thermal deformation temperature of plastic bending load GB2408-80 Test method for combustion performance of plastics Horizontal combustion method Batch inspection counting sampling procedure and sampling table (applicable to inspection of continuous batches) GB 2828-87
GB 2918--82
Standard environment for state adjustment and testing of plastic specimens 3 Classification
According to product use, plates are divided into two categories: industrial A and general B. Class A is mainly used as chemical corrosion-resistant structural materials, etc., and can also be used for other industrial materials. Class B is mainly used for civil products such as countertops and decorative materials, but is not used as food container materials. 4 Technical requirements
4.1 Specifications
The limit deviation of plate size shall comply with the requirements of Table 1. Approved by the State Bureau of Technical Supervision on December 28, 1996 234
Implementation on July 1, 1997
Thickness d
Width 6
Length 1
Appearance shall comply with the requirements of Table 2.
Unevenness
Impurities and black spots
4.3 Performance
GB/T4454—1996
Nominal size
2≤d20
20≤d50
6≥700
1≥1600
Superior products
Not allowed
The four sides should be straight lines, the four corners should be right angles, and the distance of the plate edge from the true right angle side should not exceed 8mm at 1 m from the corner top
There should be no notch with a depth greater than
3mm on the edge of the plate
The performance should meet the requirements of Table 3.
Limit Deviation
First-class products
Not obvious
Not obvious
Limit Deviation
Qualified products
The four sides should be straight lines, the four corners should be right angles, the distance of the plate edge from the true angle edge should not exceed 10mm at 1m from the corner top
There should be no notch with a depth greater than 5mm on the edge of the plate.
Not allowed
Not allowed
No obvious impurities and poorly dispersed auxiliary materials
Relative density
Tensile strength (longitudinal and transverse), MPa
Impact strength (notch, plane, Side), kJ/m2 Heat deformation temperature, ℃
Heating dimensional change rate (longitudinal and transverse), %
Integrity
Combustion performance
1.38~1.60
No crack
Corrosion degree, g/m2
40% sodium hydroxide solution
40% nitric acid solution
30% sulfuric acid solution
35% hydrochloric acid solution
10% sodium chloride solution
GB/T4454—1996
Table 3 (end)
1 For plates with a thickness greater than 20mm, the heating dimensional change rate is not assessed. 2 Combustion performance is assessed when the user requires it. 5 Test method
5.1 Specification
5.1.1 Thickness limit deviation
Measure at the four sides of the plate with a vernier caliper with an accuracy of 0.02mm, and measure at least one point on each side. Take the maximum and minimum values to calculate the limit deviation.
5.1.2 Length and width limit deviation
Measure with a steel tape measure with an accuracy of 1mm, and measure three points in the length direction and width direction respectively. Take the maximum and minimum values to calculate the limit deviation respectively.
5.2 Appearance
Visual inspection under natural light.
Measure the depth of the notch on the edge of the plate with a vernier caliper with an accuracy of 0.02mm. Use a square ruler and a steel tape measure with an accuracy of 1mm to measure the distance of the plate edge from the true right angle edge. 5.3 Performance
5.3.1 Sample preparation
The sample preparation method, sample quantity, and sample appearance requirements shall comply with the provisions of GB1039-92. 5.3.2 Sample state adjustment and test standard environment The sample state adjustment and test standard environment shall comply with the provisions of GB2918-82. The test temperature is (23±2)℃, the relative humidity is 45%~55%, the state adjustment time is not less than 24h, and the test is carried out under this condition. 5.3.3 Relative density
It shall be carried out according to the A method diffusion method in Article 4.1 of GB1033-86. 5.3.4 Tensile strength
It shall be carried out according to the provisions of GB1040-92. The sample adopts type 1, and the thickness is (10±0.05)mm. If the thickness is greater than 10mm, it shall be processed to 10mm on both sides. The test speed is (10±2)mm/min, and the results are expressed as the arithmetic mean of five samples in the longitudinal and transverse directions respectively. 5.3.5 Impact strength
Perform according to GB1043-93. Notched specimens are used, and the results are expressed as the arithmetic mean of five specimens on the plane and side. 5.3.6 Heat deformation temperature
Perform according to GB1634-79. The specimen thickness is the original thickness of the plate. When the plate thickness exceeds 13mm, the single side is processed to no more than 13mm. The maximum bending normal stress of the specimen is 18.5N. 236
5.3.7 Heating dimensional change rate
5.3.7.1 Test equipment
GB/T4454-1996
Electric heating blast drying oven: temperature fluctuation is no more than ±2℃. Vernier caliper: accuracy is 0.02mm.
Porcelain plate: smooth surface.
5.3.7.2 Test specimens and their preparation
Take three 120mm×120mm square specimens from the edge of the plate in the longitudinal direction (longitudinal direction), and mark them in the longitudinal and transverse directions respectively. Draw the longitudinal marking line AB and the transverse marking line CD on the specimen as shown in Figure 1. A
5.3.7.3 Test steps
Use a vernier caliper to measure the initial dimensions of AB and CD to an accuracy of 0.5mm, and then place the specimen flat on a porcelain plate in an electric blast drying oven at a temperature of (140±2)℃, and heat it under this temperature and blast conditions. The heating time is calculated according to formula (1), but shall not be less than 15min. After heating, take out the specimen together with the porcelain plate, cool it at room temperature for more than 2h, and use a vernier caliper to measure the dimensions of AB and CD after heating to an accuracy of 0.5mm.
Where: t
Heating time, min;
Sample thickness, mm.
5.3.7.4 Calculation and expression of results
The heating dimensional change rate is calculated according to formula (2), and the results are expressed as the arithmetic mean of the longitudinal and transverse directions, accurate to 0.1%. L = Lo × 100
Where: E---Heating dimensional change rate, %; L.
L. …The initial size of AB or CD before heating, mmL---The size of AB or CD after heating, mm.
5.3.8 Integrity
5.3.8.1 Test equipment
Constant temperature oil bath: The temperature fluctuation is not more than ±2℃, and liquid paraffin is used as the heat transfer medium. Metal sample holder: It can be made by yourself.
5.3.8.2 Samples and their preparation
(1)
Take two samples of 50mmX25mm×original thickness at any position on the four sides of the plate. The surface of the sample should be smooth and flat, without defects such as processing damage.
5.3.8.3 Test steps
GB/T 4454—1996
a) Place the sample together with the metal sample holder in a constant temperature oil bath that reaches the immersion temperature specified in Table 4. The sample must not come into contact with other samples or the wall of the bath.
Immersion temperature, ℃
Thickness ≤10mm
Thickness>10mm
Immersion time, min
180±2
162±2
b) When the oil bath temperature rises to the specified immersion temperature again, start calculating the immersion time. To
150±2
c) When the immersion time specified in Table 4 is reached, take out the sample together with the metal sample holder and immediately observe whether there is any crack on the cross section of the sample. 5.3.8.4 Result expression
If no crack is observed on the cross section of the two samples, the result is expressed as no crack. 5.3.9 Combustion performance
Test according to GB2408. Sample thickness is 3mm. When the plate thickness exceeds 3mm, one side should be processed to 3mm. 5.3.10 Corrosion
5.3.10.1 Sample preparation
Balance: accuracy 0.1mg.
Constant temperature water bath: temperature fluctuation is not more than ±2℃. Wide-mouth bottle or beaker.
Vernier caliper: accuracy 0.02mm.
Dryer.
5.3.10.2 Test specimens, corrosion solutions and their preparation Take six groups of test specimens, three in each group. The size of each test specimen is 50mm×25mm×original thickness. The processed surface should be smooth. Prepare the following six test solutions:
a) (40±1)% sodium hydroxide solution;
b) (40±1)% nitric acid solution;
c) (30±1)% sulfuric acid solution;
d) (35±1)% hydrochloric acid solution;
e) (10±1)% sodium chloride solution;
f) Water: distilled water.
5.3.10.3 Test steps
a) Place the wide-mouth bottles or beakers containing the above six corrosion solutions in a constant temperature water bath at (60±2)℃; b) Use a vernier caliper to measure the length, width and height of the sample and calculate its surface area; c) Wash and dry the sample with alcohol, then place it in a desiccator to dry for 2 hours; d) Weigh the initial mass of the sample with a balance; e) Place the samples in the above six wide-mouth bottles or beakers in groups for 5 hours, and the surface of the sample should be completely moistened; f) Take out the sample, rinse it with water, then use dry gauze or filter paper to absorb the surface moisture, and then place it in a desiccator to dry for 2 hours; g) Weigh the mass of the sample after corrosion with a balance. 5.3.10.4 Calculation and expression of results
The corrosion degree is calculated according to formula (3):
Wherein: W corrosion degree, g/m2;
mass of the sample after corrosion, g;
GB/T 4454-1996
initial mass of the sample before corrosion, g;
surface area of the sample, m2.
The results are expressed as the arithmetic mean of each group, accurate to 0.1g/m2. 6 Inspection rules
6.1 Batch
The plates produced by the same equipment, the same material, the same formula and the same process are considered as a batch. The quantity of each batch shall not exceed 50t. When the output in two weeks is less than 50t, the output in two weeks shall be considered as a batch. 6.2 Sampling
Specifications and appearance shall be carried out in accordance with GB2828. A two-time normal sampling plan shall be adopted. The general inspection level is I, and the qualified quality level (AQL) is 6.5. See Table 5.
Performance test specimens are randomly selected from the samples that have been drawn. Table 5
Batch range
51～90
91～150
151280
281~500
501～1200
1 201~～3 200
3 201~~10 000
6.3 Inspection
Sample size
Cumulative sample size
The plates are inspected in batches, which are divided into factory inspection and type inspection. 6.3.1 Factory inspection items are specifications, appearance and integrity tests. In addition to the above items, Class A products should also have heating dimensional change rate and corrosion degree. 6.3.2 Type inspection:
Type inspection is all technical requirements items. Number of qualified judgments
Number of unqualified judgments
Type inspection is required when one of the following situations occurs. GB/T 4454
a) At least once every three months during normal production; b) Trial type identification of new products or old products transferred to the factory for production; 1996
c) After formal production, when there are major changes in materials, formulas, processes, etc.; d) When production is resumed after more than three months of suspension; e) When the factory inspection results are significantly different from the last type inspection; f) When the superior quality supervision agency proposes a requirement for type inspection. 6.4 Judgment rules
6.4.1 Judgment of qualified items
6.4.1.1 Judgment of specifications and appearance
The specifications and appearance inspection results shall be judged according to Table 5. 6.4.1.2 Performance determination
If there are unqualified items in the performance test results, double samples should be taken from the original batch and retested for the unqualified items. If all the retest results are qualified, the performance is qualified.
6.4.2 Determination of qualified batches
If all the specifications, appearance and performance test results are qualified, the batch is judged to be qualified. 6.4.3 Determination of product grade
Determine according to the lowest grade of all test results. 7 Marking, packaging, transportation, storage
7.1 Marking
Each board should be affixed with a product certificate and have the following markings: a) Product name;
b) Factory name and address;
c) Trademark;
d) Board category and specification;
e) Production date and batch number;
f) Quality grade;
g) Implementation product standard number;
h) Inspector code.
7.2 Packaging
According to user needs, the boards are packaged in straw bags or other materials. 7.3 Transportation
During transportation, the boards should not be thrown, damaged on the surface, impacted, exposed to the sun, or exposed to rain. 7.4 Storage
Boards should be stored in a well-ventilated warehouse, and should be at least 1m away from heat sources. All boards stored in an environment below 0℃ should be kept at room temperature for 24 hours before use.
The shelf life of the board is two years from the date of production.3 Test steps
GB/T 4454—1996
a) Place the sample together with the metal sample holder in a constant temperature oil bath that reaches the immersion temperature specified in Table 4. The sample must not come into contact with other samples or the wall of the bath.
Immersion temperature, ℃
Thickness ≤10mm
Thickness>10mm
Immersion time, min
180±2
162±2
b) When the oil bath temperature rises to the specified immersion temperature again, start calculating the immersion time. To
150±2
c) When the immersion time specified in Table 4 is reached, take out the sample together with the metal sample holder and immediately observe whether there is any crack on the cross section of the sample. 5.3.8.4 Result expression
If no crack is observed on the cross section of the two samples, the result is expressed as no crack. 5.3.9 Combustion performance
Test according to GB2408. Sample thickness is 3mm. When the plate thickness exceeds 3mm, one side should be processed to 3mm. 5.3.10 Corrosion
5.3.10.1 Sample preparation
Balance: accuracy 0.1mg.
Constant temperature water bath: temperature fluctuation is not more than ±2℃. Wide-mouth bottle or beaker.
Vernier caliper: accuracy 0.02mm.
Dryer.
5.3.10.2 Test specimens, corrosion solutions and their preparation Take six groups of test specimens, three in each group. The size of each test specimen is 50mm×25mm×original thickness. The processed surface should be smooth. Prepare the following six test solutions:
a) (40±1)% sodium hydroxide solution;
b) (40±1)% nitric acid solution;
c) (30±1)% sulfuric acid solution;
d) (35±1)% hydrochloric acid solution;
e) (10±1)% sodium chloride solution;
f) Water: distilled water.
5.3.10.3 Test steps
a) Place the wide-mouth bottles or beakers containing the above six corrosion solutions in a constant temperature water bath at (60±2)℃; b) Use a vernier caliper to measure the length, width and height of the sample and calculate its surface area; c) Wash and dry the sample with alcohol, then place it in a desiccator to dry for 2 hours; d) Weigh the initial mass of the sample with a balance; e) Place the samples in the above six wide-mouth bottles or beakers in groups for 5 hours, and the surface of the sample should be completely moistened; f) Take out the sample, rinse it with water, then use dry gauze or filter paper to absorb the surface moisture, and then place it in a desiccator to dry for 2 hours; g) Weigh the mass of the sample after corrosion with a balance. 5.3.10.4 Calculation and expression of results
The corrosion degree is calculated according to formula (3):
Wherein: W corrosion degree, g/m2;
mass of the sample after corrosion, g;
GB/T 4454-1996
initial mass of the sample before corrosion, g;
surface area of the sample, m2.
The results are expressed as the arithmetic mean of each group, accurate to 0.1g/m2. 6 Inspection rules
6.1 Batch
The plates produced by the same equipment, the same material, the same formula and the same process are considered as a batch. The quantity of each batch shall not exceed 50t. When the output in two weeks is less than 50t, the output in two weeks shall be considered as a batch. 6.2 Sampling
Specifications and appearance shall be carried out in accordance with GB2828. A two-time normal sampling plan shall be adopted. The general inspection level is I, and the qualified quality level (AQL) is 6.5. See Table 5.
Performance test specimens are randomly selected from the samples that have been drawn. Table 5
Batch range
51～90
91～150
151280wwW.bzxz.Net
281~500
501～1200
1 201~～3 200
3 201~~10 000
6.3 Inspection
Sample size
Cumulative sample size
The plates are inspected in batches, which are divided into factory inspection and type inspection. 6.3.1 Factory inspection items are specifications, appearance and integrity tests. In addition to the above items, Class A products should also have heating dimensional change rate and corrosion degree. 6.3.2 Type inspection:
Type inspection is all technical requirements items. Number of qualified judgments
Number of unqualified judgments
Type inspection is required when one of the following situations occurs. GB/T 4454
a) At least once every three months during normal production; b) Trial type identification of new products or old products transferred to the factory for production; 1996
c) After formal production, when there are major changes in materials, formulas, processes, etc.; d) When production is resumed after more than three months of suspension; e) When the factory inspection results are significantly different from the last type inspection; f) When the superior quality supervision agency proposes a requirement for type inspection. 6.4 Judgment rules
6.4.1 Judgment of qualified items
6.4.1.1 Judgment of specifications and appearance
The specifications and appearance inspection results shall be judged according to Table 5. 6.4.1.2 Performance determination
If there are unqualified items in the performance test results, double samples should be taken from the original batch and retested for the unqualified items. If all the retest results are qualified, the performance is qualified.
6.4.2 Determination of qualified batches
If all the specifications, appearance and performance test results are qualified, the batch is judged to be qualified. 6.4.3 Determination of product grade
Determine according to the lowest grade of all test results. 7 Marking, packaging, transportation, storage
7.1 Marking
Each board should be affixed with a product certificate and have the following markings: a) Product name;
b) Factory name and address;
c) Trademark;
d) Board category and specification;
e) Production date and batch number;
f) Quality grade;
g) Implementation product standard number;
h) Inspector code.
7.2 Packaging
According to user needs, the boards are packaged in straw bags or other materials. 7.3 Transportation
During transportation, the boards should not be thrown, damaged on the surface, impacted, exposed to the sun, or exposed to rain. 7.4 Storage
Boards should be stored in a well-ventilated warehouse, and should be at least 1m away from heat sources. All boards stored in an environment below 0℃ should be kept at room temperature for 24 hours before use.
The shelf life of the board is two years from the date of production.3 Test steps
GB/T 4454—1996
a) Place the sample together with the metal sample holder in a constant temperature oil bath that reaches the immersion temperature specified in Table 4. The sample must not come into contact with other samples or the wall of the bath.
Immersion temperature, ℃
Thickness ≤10mm
Thickness>10mm
Immersion time, min
180±2
162±2
b) When the oil bath temperature rises to the specified immersion temperature again, start calculating the immersion time. To
150±2
c) When the immersion time specified in Table 4 is reached, take out the sample together with the metal sample holder and immediately observe whether there is any crack on the cross section of the sample. 5.3.8.4 Result expression
If no crack is observed on the cross section of the two samples, the result is expressed as no crack. 5.3.9 Combustion performance
Test according to GB2408. Sample thickness is 3mm. When the plate thickness exceeds 3mm, one side should be processed to 3mm. 5.3.10 Corrosion
5.3.10.1 Sample preparation
Balance: accuracy 0.1mg.
Constant temperature water bath: temperature fluctuation is not more than ±2℃. Wide-mouth bottle or beaker.
Vernier caliper: accuracy 0.02mm.
Dryer.
5.3.10.2 Test specimens, corrosion solutions and their preparation Take six groups of test specimens, three in each group. The size of each test specimen is 50mm×25mm×original thickness. The processed surface should be smooth. Prepare the following six test solutions:
a) (40±1)% sodium hydroxide solution;
b) (40±1)% nitric acid solution;
c) (30±1)% sulfuric acid solution;
d) (35±1)% hydrochloric acid solution;
e) (10±1)% sodium chloride solution;
f) Water: distilled water.
5.3.10.3 Test steps
a) Place the wide-mouth bottles or beakers containing the above six corrosion solutions in a constant temperature water bath at (60±2)℃; b) Use a vernier caliper to measure the length, width and height of the sample and calculate its surface area; c) Wash and dry the sample with alcohol, then place it in a desiccator to dry for 2 hours; d) Weigh the initial mass of the sample with a balance; e) Place the samples in the above six wide-mouth bottles or beakers in groups for 5 hours, and the surface of the sample should be completely moistened; f) Take out the sample, rinse it with water, then use dry gauze or filter paper to absorb the surface moisture, and then place it in a desiccator to dry for 2 hours; g) Weigh the mass of the sample after corrosion with a balance. 5.3.10.4 Calculation and expression of results
The corrosion degree is calculated according to formula (3):
Wherein: W corrosion degree, g/m2;
mass of the sample after corrosion, g;
GB/T 4454-1996
initial mass of the sample before corrosion, g;
surface area of the sample, m2.
The results are expressed as the arithmetic mean of each group, accurate to 0.1g/m2. 6 Inspection rules
6.1 Batch
The plates produced by the same equipment, the same material, the same formula and the same process are considered as a batch. The quantity of each batch shall not exceed 50t. When the output in two weeks is less than 50t, the output in two weeks shall be considered as a batch. 6.2 Sampling
Specifications and appearance shall be carried out in accordance with GB2828. A two-time normal sampling plan shall be adopted. The general inspection level is I, and the qualified quality level (AQL) is 6.5. See Table 5.
Performance test specimens are randomly selected from the samples that have been drawn. Table 5
Batch range
51～90
91～150
151280
281~500
501～1200
1 201~～3 200
3 201~~10 000
6.3 Inspection
Sample size
Cumulative sample size
The plates are inspected in batches, which are divided into factory inspection and type inspection. 6.3.1 Factory inspection items are specifications, appearance and integrity tests. In addition to the above items, Class A products should also have heating dimensional change rate and corrosion degree. 6.3.2 Type inspection:
Type inspection is all technical requirements items. Number of qualified judgments
Number of unqualified judgments
Type inspection is required when one of the following situations occurs. GB/T 4454
a) At least once every three months during normal production; b) Trial type identification of new products or old products transferred to the factory for production; 1996
c) After formal production, when there are major changes in materials, formulas, processes, etc.; d) When production is resumed after more than three months of suspension; e) When the factory inspection results are significantly different from the last type inspection; f) When the superior quality supervision agency proposes a requirement for type inspection. 6.4 Judgment rules
6.4.1 Judgment of qualified items
6.4.1.1 Judgment of specifications and appearance
The specifications and appearance inspection results shall be judged according to Table 5. 6.4.1.2 Performance determination
If there are unqualified items in the performance test results, double samples should be taken from the original batch and retested for the unqualified items. If all the retest results are qualified, the performance is qualified.
6.4.2 Determination of qualified batches
If all the specifications, appearance and performance test results are qualified, the batch is judged to be qualified. 6.4.3 Determination of product grade
Determine according to the lowest grade of all test results. 7 Marking, packaging, transportation, storage
7.1 Marking
Each board should be affixed with a product certificate and have the following markings: a) Product name;
b) Factory name and address;
c) Trademark;
d) Board category and specification;
e) Production date and batch number;
f) Quality grade;
g) Implementation product standard number;
h) Inspector code.
7.2 Packaging
According to user needs, the boards are packaged in straw bags or other materials. 7.3 Transportation
During transportation, the boards should not be thrown, damaged on the surface, impacted, exposed to the sun, or exposed to rain. 7.4 Storage
Boards should be stored in a well-ventilated warehouse, and should be at least 1m away from heat sources. All boards stored in an environment below 0℃ should be kept at room temperature for 24 hours before use.
The shelf life of the board is two years from the date of production.1 batch
A batch is a plate produced with the same equipment, the same material, the same formula and the same process. The quantity of each batch shall not exceed 50t. When the output in two weeks is less than 50t, the output in two weeks shall be considered as one batch. 6.2 Sampling
Specifications and appearance shall be carried out in accordance with GB2828. A secondary normal sampling plan shall be adopted. The general inspection level is I and the qualified quality level (AQL) is 6.5, see Table 5.
Performance test piece shall be randomly selected from the samples already drawn. Table 5
Batch range
51～90
91～150
151280
281~500
501～1200
1 201~～3 200
3 201~~10 000
6.3 Inspection
Sample size
Cumulative sample size
Plates are inspected in batches, which are divided into factory inspection and type inspection. 6.3.1 Factory inspection items include specification, appearance and integrity test. In addition to the above items, Class A products should also have heating dimensional change rate and corrosion degree. 6.3.2 Type inspection:
Type inspection includes all technical requirements items. Number of qualified judgments
Number of unqualified judgments
Type inspection is required when one of the following situations occurs. GB/T 4454
a) At least once every three months during normal production; b) Trial type identification of new products or old products transferred to the factory for production; 1996
c) After formal production, when there are major changes in materials, formulas, processes, etc.; d) When production is resumed after more than three months of suspension; e) When the factory inspection results are significantly different from the last type inspection; f) When the superior quality supervision agency proposes a requirement for type inspection. 6.4 Judgment rules
6.4.1 Judgment of qualified items
6.4.1.1 Judgment of specifications and appearance
The specifications and appearance inspection results shall be judged according to Table 5. 6.4.1.2 Performance determination
If there are unqualified items in the performance test results, double samples should be taken from the original batch and retested for the unqualified items. If all the retest results are qualified, the performance is qualified.
6.4.2 Determination of qualified batches
If all the specifications, appearance and performance test results are qualified, the batch is judged to be qualified. 6.4.3 Determination of product grade
Determine according to the lowest grade of all test results. 7 Marking, packaging, transportation, storage
7.1 Marking
Each board should be affixed with a product certificate and have the following markings: a) Product name;
b) Factory name and address;
c) Trademark;
d) Board category and specification;
e) Production date and batch number;
f) Quality grade;
g) Implementation product standard number;
h) Inspector code.
7.2 Packaging
According to user needs, the boards are packaged in straw bags or other materials. 7.3 Transportation
During transportation, the boards should not be thrown, damaged on the surface, impacted, exposed to the sun, or exposed to rain. 7.4 Storage
Boards should be stored in a well-ventilated warehouse, and should be at least 1m away from heat sources. All boards stored in an environment below 0℃ should be kept at room temperature for 24 hours before use.
The shelf life of the board is two years from the date of production.1 batch
A batch is a plate produced with the same equipment, the same material, the same formula and the same process. The quantity of each batch shall not exceed 50t. When the output in two weeks is less than 50t, the output in two weeks shall be considered as one batch. 6.2 Sampling
Specifications and appearance shall be carried out in accordance with GB2828. A secondary normal sampling plan shall be adopted. The general inspection level is I and the qualified quality level (AQL) is 6.5, see Table 5.
Performance test piece shall be randomly selected from the samples already drawn. Table 5
Batch range
51～90
91～150
151280
281~500
501～1200
1 201~～3 200
3 201~~10 000
6.3 Inspection
Sample size
Cumulative sample size
Plates are inspected in batches, which are divided into factory inspection and type inspection. 6.3.1 Factory inspection items include specification, appearance and integrity test. In addition to the above items, Class A products should also have heating dimensional change rate and corrosion degree. 6.3.2 Type inspection:
Type inspection includes all technical requirements items. Number of qualified judgments
Number of unqualified judgments
Type inspection is required when one of the following situations occurs. GB/T 4454
a) At least once every three months during normal production; b) Trial type identification of new products or old products transferred to the factory for production; 1996
c) After formal production, when there are major changes in materials, formulas, processes, etc.; d) When production is resumed after more than three months of suspension; e) When the factory inspection results are significantly different from the last type inspection; f) When the superior quality supervision agency proposes a requirement for type inspection. 6.4 Judgment rules
6.4.1 Judgment of qualified items
6.4.1.1 Judgment of specifications and appearance
The specifications and appearance inspection results shall be judged according to Table 5. 6.4.1.2 Performance determination
If there are unqualified items in the performance test results, double samples should be taken from the original batch and retested for the unqualified items. If all the retest results are qualified, the performance is qualified.
6.4.2 Determination of qualified batches
If all the specifications, appearance and performance test results are qualified, the batch is judged to be qualified. 6.4.3 Determination of product grade
Determine according to the lowest grade of all test results. 7 Marking, packaging, transportation, storage
7.1 Marking
Each board should be affixed with a product certificate and have the following markings: a) Product name;
b) Factory name and address;
c) Trademark;
d) Board category and specification;
e) Production date and batch number;
f) Quality grade;
g) Implementation product standard number;
h) Inspector code.
7.2 Packaging
According to user needs, the boards are packaged in straw bags or other materials. 7.3 Transportation
During transportation, the boards should not be thrown, damaged on the surface, impacted, exposed to the sun, or exposed to rain. 7.4 Storage
Boards should be stored in a well-ventilated warehouse, and should be at least 1m away from heat sources. All boards stored in an environment below 0℃ should be kept at room temperature for 24 hours before use.
The shelf life of the board is two years from the date of production.
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