JB/T 10437-2004 Cross-linkable polyethylene insulation materials for wires and cables
Some standard content:
ICS 29.035.20
Machinery Industry Standard of the People's Republic of China
JB/T10437—2004
Cross-linkable polyethylene insulating compounds for wires and cables cables2004-03-12issued
2004-08-01implemented
issued by the National Development and Reform Commission of the People's Republic of ChinaForeword
standard
normative references
3applicable characteristics
1code and product support method
series code
characteristic code
characteristic code
product representation method
5according to technical requirements..
mechanical physical properties and essential properties
impurity contentbzxz.net
processing performance change requirements
test method,
appearance inspection.
sample preparation
tensile humidity And gradual crack elongation test
Impact corrosion resistance test,
Air heat aging test
Hot extension test
Gel content test
Volume resistivity test
Dielectric strength test.
Dielectric loss factor and relative dielectric constant test, impurity content test,
7 Frequency planning.
Test classification
Batch and sampling test
Qualification judgment
8 Packaging, marking, transportation and storage
Modify A (current normative requirements) to avoid the most complete test method A.1 Filter range
A.3 Test method
Test method
Appendix B: Normative Appendix! Impurity content detection method B.1
Appendix Fan Jun
Detection principle
JB/T10437--2004
JB/T10497—2004
Impurity particle detection instrument resolution
Dot marking requirements
B.5 Sample preparation
Detection steps
Extraction device
Impurity placement Detection principle diagram
This standard is prepared for the first time.
Appendix A and Appendix B of this standard are normative appendices. This standard is proposed by the China Machinery Industry Federation. This international standard is under the jurisdiction of the National Electric Wire and Relay Catalysis Technical Committee. JB/T10437—2004
Drafting unit of this standard: Shanghai Cable Research Institute, Shangyou Chemical Factory Co., Ltd., Heli Wanqi Plastic Co., Ltd., Shangmeiniangu Polymer Material Factory, Zhejiang Wanma Polymer Material Co., Ltd., Qingdi Xingyue Plastic Products Factory, Oushi Chemical Factory, Guangdong Beiyu Guangyao Xingpu Plastic Co., Ltd., Hangzhou Dida Electric Materials Co., Ltd. Approved by: Huang Zhilin, Shan Yilong. 1
Cross-linked polyolefin insulation for wire and cable J/110437--2004
This standard specifies the technical requirements, test methods, inspection rules, packaging, marking, and transportation requirements for cross-linked polyethylene insulation for 35kV and below cross-linked polyethylene insulated wire and cable. This standard applies to peroxide cross-linked polyethylene with low-emission olefins as the base material, added with cross-linking agents and other agents, and made by plasticization. Insulation materials made of cross-linked polyethylene and radiation cross-linked polymers: The applicable scope is: (1--35) kV peroxide cross-linked polyethylene insulation materials: (1~35) kV silane cross-linked ethylene insulation materials (110) kV irradiation cross-linked ethylene insulation materials. 2 Normative references || tt || The clauses in the following documents become clauses of this standard through reference in this standard. For any referenced document with a specified date, its subsequent revised version (excluding the error rate) or revised edition is not applicable to this standard. The parties who reach an agreement on this standard are encouraged to study whether the latest version of this document is applicable. For any referenced document without a specified date, the latest version shall apply to this standard. GB/T1(40 Plastic tensile properties test method CIB/T14n8. 1—[9y Test method for electrical conductivity of solid insulating materials at power frequency (eqV EN 60243-1988) GRT 1409 Test method for relative dielectric constant and dielectric constant of solid insulating materials at power frequency, acoustic frequency and high frequency (including technical wavelength) (GB/T 1409-1989) VTEC (025f: 1969) GB/T 1410 Test method for volume conductivity and surface conductivity of solid insulating materials (GB/T 14101989, cgV EN 60093: 1980 GB/T 29512199? Common test methods for cable insulation and sheathing materials Part 1: General test methods Section 2: Thermal conductivity test method (dIFC 60811-1-2: 1985, No. ! (1989) No. 1) (B2951.5-1997 General test methods for cable insulation and sheathing materials Part 2: Elastomer composite material method Part 1: Pre-oxidation test - Heat resistance test: Mineral oil test (dLEC60811-2-1: 1986, Np, 1 (192) No. 2 (1993) Second revision)
GB/T5470 Plastic impact test temperature test method 3 Use characteristics
The maximum allowable operating temperature for the long term is +9 °C: 4 Code and product representation method
4.1 Series code
Series code
4.2 Characteristic code
Applicable to 35kV and below electric shock - 35
Applicable -10kV and below cables -10
Applicable to 3k and below cables -3
4.3 Characteristic code
Peroxide cross-linking: pipe
Silane cross-linking-·-1
JB/T10437-2004
Car cross-linking F
4.4 Product representation method
Products are represented by models. The product model composition examples are as follows: Example 1: 351V and below cross-linking ethylene-based insulation material with reverse oxidation pre-crosslinking ticket hexane-35 Example 2: 10kV and below cross-linking polyvinyl chloride cross-linking insulation material YI10 Example 3: 1V and below cross-linking ethylene-based insulation material with silane cross-linking Example 4, 3V is changed to \ cross-linking ethylene 5. Technical requirements for cross-linked insulating materials for battery stacks
5.1 Appearance
The insulating material should be granular, with a diameter of about 4mm, a quotient of 3μm, and uniform color and particle size. The particles should not have obvious powdery substances.
5.2 Mechanical and physical properties and electrical properties
The mechanical and physical and electrical properties of the insulating material should comply with the requirements of Table 1. Table 1
Resistance to degradation
New
Shock environment aging
Test safety
Shock pulse aging performance
Air cotton aging
Test conditions: thermal aging
To be continued)
Tensile strength change rate
New
Ci Yan Yang|| tt||200T:0.2MP15min
Elongation under load
Deformation after heating
Title glue content
Full-duty solid number 50Hz, 20℃
Relative dielectric band number 50H, 20Y
Building efficiency
Dielectric strength
5.3Impurity content||tt ||Fu effect
135±2
55X101
YK3-35
135±2
YIR-JO
135±2
$15/30
135±2
:=1×0
2：15/30
135 f2
:1×10'1
For the 1kg sample of YJ-35 and YJG-35 cross-linkable ethylene insulation material, the number of impurity particles of (0.175--0.250)mm should not exceed 5, and the number of impurity particles larger than 0.250mm should be less than 5. 5.4 Process performance requirements
If the user has requirements, manufacture! Provide the extrusion temperature range and rheological properties of the insulation material: (This process parameter is only for the cross-linked polyethylene insulation material of the gasification process.) JB/T10437-2004 7. The material requirements include: and cross-linking process parameters and other data: For cross-linked polyethylene insulation material of the gasification process, the melt flow rate of the benzene material is also provided. 6 Test method 6.1 Appearance inspection The appearance of the material should be inspected under natural light with normal force. 6.2 Sample preparation 6.2.1 Preparation of peroxide cross-linked ethylene insulation material test pieces The peroxide cross-linked ethylene insulation material test pieces are prepared by the molding method. The insulation material particles are plasticized and sheeted on a plasticizer at (115~12U)C, and then preheated for 10min in a hydraulic press at (115~120) without pressure. The cross-linking condition of the sample is (180=2)m3×15ml. The positive strength of the hydraulic press should be greater than 15MPa. After combustion, pressurize and cool to room temperature. The test piece should be flat and smooth, with uniform thickness and electrical performance test. The peroxide cross-linked ethylene insulation material test piece can also be prepared by direct molding of granules. Place the insulating material particles in a dry sheet mold and heat them in a (115120) temperature press for 10 minutes without pressure: the crosslinking condition of the sample is (180±2×15u11) and the pressure of the hydraulic press should be 15MPa. Then cool the sheet under pressure to room temperature. The test piece should be flat, smooth and of uniform thickness. There should be no bubbles. 2.2 Preparation of Silane Cross-linked Polyethylene Test Specimens Injection Silane cross-linked polyethylene test pieces should be prepared by the correct method (the extrusion conditions for sample preparation are provided by the manufacturer). The test piece should be calendered at the die mouth: the test piece should be flat and smooth, with a thickness of 1/4 inch. Then place it in a water bath with a temperature of (6-8°C) and a temperature of (0-120°C). After crosslinking, the test piece still remains flat. Electrical connection test piece The material of the cross-linked polymer can be prepared by pressure. Strips of silane cross-linked polyethylene can be prepared by pressure. The sheets will be cut into soft sheets of industrial quality, and preheated in a hydraulic press at (160~170)℃ without pressure for 1 minute. Then pressurized and heated for 4 minutes to form the sheet: the strength of the sheet should be greater than 15MPu. Cool under pressure to room temperature, the sheet should be flat and smooth, uniform in strength, and free of air filtration. Then put the sheet into water at a temperature of (90-95)℃ for [6--months]. After warm water crosslinking, the sheet should remain flat. 6.2.3 Preparation of cross-linked polyolefin insulation material samples The cross-linked polyolefin insulation material samples are prepared by mold expansion. The insulating material particles are plasticized and formed into sheets at (150-155)℃. Then store at ([6)-170℃) for about 6 minutes without pressure and preheat. Then pressurized and heated for 4 minutes to form the sheet, and the positive pressure of the hydraulic press should be greater than 15mPa. Press to Room temperature. The test piece should be flat and smooth, with uniform curing and no bubbles. Then the test piece is irradiated and cross-linked: the irradiation dose should be determined by the manufacturer! Strong recommendation! : After irradiation and cross-linking, the test piece should still remain flat. 6.2.4 The thickness of the test piece should be
The test piece should meet the requirements of the test purpose. 6.3 Tensile strength and elongation at break test
The tensile strength and elongation at break test shall be carried out in accordance with GH/T1040. The test piece is a type II dumb age piece with a thickness of (1.+0.1) mu and a tensile speed of (250±5n) cmi r.
6.4 Impact embrittlement temperature test
The chemical humidity test shall be carried out in accordance with GB5470, or the thickness of the piece is (1.6±0.1) m, and each group shall be divided into 3 samples, and the number of test rods breaking load shall not exceed 100%. More than 15.
6.5 Air heat aging test
The valid test pieces for air heat aging test shall be no less than 5 pieces. Under the aging conditions specified in the table, the aging treatment shall be carried out according to GB 2951.2-1-9.1, and then the tensile shortness and elongation at break test shall be carried out according to 6.3. 6.6 Heat extension test
The heat extension test shall be carried out according to the provisions of Chapter 9 of B/T2951.5-1947F. The test piece shall be I-type rotating piece specified in G/140, and the width shall be (1±0.1) rm
G.7 Gel content test
The gel content test shall be carried out according to the provisions of A. If the test result is not available, the test method specified in A.3 of Appendix A shall be used as the test method.
JB/T10437—2004
8.8 Volume resistivity test
The volume resistivity test shall be carried out in accordance with the provisions of GB/T1408.14[0. The thickness of the test piece is (1.0+0.1) mm, or the test temperature is (2U±2!℃, and the test voltage is 1kV
日.9 Dielectric strength test
The dielectric strength test shall be carried out in accordance with the provisions of (B/T1408.1199). The electrodes shall be , the electrode point diameter is 251mm, the two arc radii of the electrode side are 2.5mm: the test piece thickness is (1.0±0.1)mm, the relative dielectric constant of the test oil should be close to 2.3, and have sufficient dielectric strength. The start and end of the test are equal, and the voltage is increased from 0 to V at a fast rate. From V, the voltage is broken down, and the selection rate should not be greater than mega.
6.10 Dielectric loss factor and relative dielectric constant test Dielectric loss factor and relative dielectric constant test should be According to G14, the test piece is clean (1.0.1) mm6.11 Impurity content test
The impurity content test should be carried out according to the provisions of Appendix B. 7 Inspection rules
7.1 Inspection classification
The inspection specified in this standard is divided into factory inspection and pre-production inspection. 7.1.1 Each batch of products must be inspected at the time of delivery. The factory inspection is a sampling test! Code $), each product should be produced by the inspection department and the sample test should be qualified Only after the product leaves the factory, 7.1.2 Flat inspection shall be conducted to fully assess the product quality, that is, all the technical requirements specified in this standard shall be tested on a daily basis (No. T:
Type test shall be conducted in the following situations) Trial type identification of new products or products transferred to the factory for production: b) After normal production, if there are major changes in materials and processes, which may affect product performance c) During normal production, every other:
: After the product has been discontinued for a long time, during more production:) When the inspection results are significantly different from those of the previous type inspection; f! The national quality supervision and enforcement agency proposes the requirements for type inspection. 7.13 Test items and the legal inspection categories are specified in Table 2. Test objectives
Appearance inspection
Tensile strength
New stock length ratio
Impact insulation temperature instrument
Air thermal aging
Hot elongation
Batching and sampling rules
Test monitoring
Test indicators
Condensate content
Dielectric absorption efficiency
Relative dielectric number
Volume resistivity
Complete strength
Quality view
One production batch of products is one inspection unit, and each production batch is 20t. If the batch is less than 20t, it can still be regarded as one batch. Test samples should be randomly taken from three packaging units of a batch of parent products and mixed to prepare test samples. 7.3 Qualification determination
Test category
The test results of all test items in Table 2 shall comply with the provisions of 5.1-5.3: JB/T 104372004
When any item of the factory test fails to meet the requirements, the unqualified test item shall be subjected to double sample test. If it still fails to meet the requirements, the batch of products shall be determined as unqualified products.
B Packaging, marking, transportation and storage
B.1YI type insulation materials shall be packed in moisture-proof packaging with reinforced tangled vinyl film and placed in a sturdy box with a pallet at the bottom. Y-type insulation materials should be packaged in the same moisture-proof packaging, with reinforced polyethylene film bags for the inner bag and polypropylene woven fabric/polyethylene/kraft paper composite bags for the outer bag. YIG-type insulation materials are packaged in non-transparent packaging, with box/polyethylene composite film bags for the inner bag and polypropylene woven fabric/polyethylene/kraft paper composite bags for the outer bag. The net weight of each package should be: (25=0.2) kg, and no negative tolerance is allowed per ton of material. Other packaging methods that are acceptable to the manufacturer and the user are also allowed. 2. The packaging form should indicate the manufacturer's name, factory station, product name, model, batch number, manufacturing date, effective use period and moisture-proof mark. The packaging should be accompanied by a product certificate: each batch of products should be accompanied by a factory inspection report. 3. The insulation materials should not be damaged by improper conditions such as sunlight and water during transportation. 4.4 Insulating materials should be stored in a clean, well-ventilated warehouse at a temperature not lower than 30 °C. The storage period of insulating materials should not exceed 1 month from the date of production: JBT10437-2004 Applicable Specification for Insulating Materials A (Normative Appendix) Test Method for Gel Content Test method and test method 2 are both used to test the gel content of cross-linkable vinyl insulating materials. The test method is based on the test method.
A.2 Sample
A.2.1 Sample preparation
The sample prepared in accordance with 6.2 shall be cut into pellets of approximately 0.5 mm x 0.5 mm x 0.5 mm in size. A.22 Sample conditioning
Before the test, the sample shall be placed at a temperature of 23 + 2) °C and a relative humidity of (50 + 5)% for at least 40 hours. If necessary, the temperature error shall be ±1 °C and the relative humidity error shall be ±2%. A.3 Test method 1
4.3.1 Test conditions
The test shall be carried out in a standard laboratory atmosphere of (23 + 2)% and a relative humidity of (50 + 5)%. A.3.2 Test equipment
The test equipment should be the small type shown in Figure 1, with a thin metal wire mesh and a stable network: a cold water inlet,
T control station:
production port suction or ink joint: (
a wide-mouth sun bottom burning topic
cooling water outlet: 9 iron ring rack.
bath fan:
A.3.2.1 Round bottom flask
-12 containing samples with a hole width of 0.12m, Figure 4.1 Rate sampling device
JB/T10437-2004
The bottom of the series should have a wide mouth glass joint or cork joint: 500mL flask is suitable for measuring one or two samples at a time, 20ml porcelain bottle is suitable for measuring several samples at a time. , but not more than 6: A.3.2.2 Heating condenser
The heating condenser shall be compatible with the burner and have sufficient heating capacity to boil ten-degree hot water (boiling point 190℃～193℃) or two-degree hot water (point 138--[4]).
A.3.2.3 Reflux burner
The reverse flow condenser shall have a mouthpiece or cork connection compatible with the bottle: A.3.2.4 Iron ring stand ||t t||The iron ring rack should be equipped with appropriate clamps to securely fix the round bottom flask and the reflux decondenser. A.3.2.5 The re-vacuum oven
is equipped with a vacuum pump capable of establishing a vacuum system of at least 710 mm x 10 mm and a thermometer capable of measuring 15°C. A.3.3 Reagents
3.3.11 Hydrogen nitrate
should be of practical grade deoxygen nitrate with a boiling point of 190°C--193°C. A.3.3.2 Xylene
ACS reagent grade dimethylbenzene, boiling point 138℃~141mm. A.3.4 Test specimens
At least two test specimens shall be tested, each containing 0.300 ± 0.015g of the particles prepared in accordance with A.2.1, weighed with an accuracy of t. price ig: and treated with the components specified in A.2.2. A.3.5 Test procedure
A.3.5.1 Cut a stainless steel key wire with a hole width of 0.12mm to make a square door of about 40mmX40mm, and Weigh (W) Put about 0.3g of sample into the weighed stainless steel mesh bag, weigh (W), and then put the stainless steel mesh bag with sample into the bottom flask. Tie the wire to the mesh and extend it through the reflux condenser. You can use this to hang the mesh bag so that the bottom of the mesh bag almost touches the bottom of the flask. Put enough reagent into the round flask and completely fill the stainless steel mesh bag with sample. 500ml flask needs to be filled with 350g reagent: 2000uL flask needs to be filled with 1000g reagent. A. 5.2 Boil vigorously for 10 minutes or 10% ethanol to ensure good vibration of the solution: When using 1000% reagent, the boiling speed is preferably 20-40 drops of liquid per minute on the condenser. The sample is collected in 10-20% ethanol for 6 hours, and 121 should be collected in 10% ethanol. Note: The power lies in the specified time: the ability to take part of the light bull, to achieve this basic experience to shorten the time to take. The shortened time to take the classics need to be reported. For the load test, the extraction should be carried out according to the specified time. 4.3.5.3 At the same time, the mesh bag containing the sample shall be immediately heated to 150°C in a vacuum oven and dried under an air pressure of at least 710 m3/s to constant weight. Cool and weigh (if the sample absorbs moisture, the sample shall be cooled in a desiccator before weighing). 4.3.6 Calculation of test results The gel content of the sample shall be calculated according to the following formula: Wherein: Gel content - % x 100% - weight of the stainless steel wire mesh bag, in g: W - weight of the wire mesh bag and the net, in g: W - weight of the sample and the net after extraction and drying, in g. 4 Test method II 4.4.1 Test instrument ||JB/T10437--2004
) Analytical balance, accuracy 0.Jmg
b) Air box, temperature control 2
) Vacuum drying box:
d) 1Xml, ground mouth:
stainless steel wire mesh with a hole width of 12m
for tenderizer
A.4.2 Test specimens
At least two samples should be tested: each sample contains (0.500±0.020)% of the measured particles prepared according to A.2.1: the weighing accuracy is 0.001g and is not treated under the conditions specified in A2.2. A.4.3 Test case
The test should be carried out in a standard laboratory atmosphere of (23±2) and relative humidity of [5±5)%. A.4.4 Test steps
Make a stainless steel wire into a 40 mm × 4 mm square bag and weigh it (W>). Put about 0.5 g of the sample into a stainless steel mesh bag and weigh it (pieces). Put the stainless steel wire containing the sample into a sealed door and pour a layer of methyl ether until the liquid is filled to more than 10 mm at the bottom. Put it in a sealed bottle and place it in an air box at a temperature of 110°C for 24 hours. Take out the grinding bottle and open the cover. Put it in an air oven at 10 At 77°C, air dry for 24 hours. Take out the ground-mouth bottle, put it in a container and cool it to room temperature, take out the mesh bag and weigh it (W).
A.4.5 Calculation of test results
The gel content of the sample is calculated by the following formula
Gel content x 100%
Where:
Stainless steel wire mesh bag: Unit: g:
W—weight of sample and mesh bag, unit:
W—weight of sample and mesh bag after drying, unit: g.2. Boil vigorously for 10 minutes or 10% ethanol to ensure good solvent vibration: when using 1000% reagent, the boiling speed is preferably 20-40 drops of liquid per minute on the condenser. The sample is collected in 10% ethanol for 6 hours and 121 should be collected in 10% ethanol. Note: The main point is that the sample can be collected within the specified time. This can be achieved by shortening the collection time based on experience. The shortened collection time needs to be reported. For the load test, the extraction should be carried out according to the specified time. 4.3.5.3 At the same time, the mesh bag containing the sample shall be immediately heated to 150°C in a vacuum oven and dried under an air pressure of at least 710 m3/s to constant weight. Cool and weigh (if the sample absorbs moisture, the sample shall be cooled in a desiccator before weighing). 4.3.6 Calculation of test results The gel content of the sample shall be calculated according to the following formula: Wherein: Gel content - % x 100% - weight of the stainless steel wire mesh bag, in g: W - weight of the wire mesh bag and the net, in g: W - weight of the sample and the net after extraction and drying, in g. 4 Test method II 4.4.1 Test instrument ||JB/T10437--2004
) Analytical balance, accuracy 0.Jmg
b) Air box, temperature control 2
) Vacuum drying box:
d) 1Xml, ground mouth:
stainless steel wire mesh with a hole width of 12m
for tenderizer
A.4.2 Test specimens
At least two samples should be tested: each sample contains (0.500±0.020)% of the measured particles prepared according to A.2.1: the weighing accuracy is 0.001g and is not treated under the conditions specified in A2.2. A.4.3 Test case
The test should be carried out in a standard laboratory atmosphere of (23±2) and relative humidity of [5±5)%. A.4.4 Test steps
Make a stainless steel wire into a 40 mm × 4 mm square bag and weigh it (W>). Put about 0.5 g of the sample into a stainless steel mesh bag and weigh it (pieces). Put the stainless steel wire containing the sample into a sealed door and pour a layer of methyl ether until the liquid is filled to more than 10 mm at the bottom. Put it in a sealed bottle and place it in an air box at a temperature of 110°C for 24 hours. Take out the grinding bottle and open the cover. Put it in an air oven at 10 At 77°C, air dry for 24 hours. Take out the ground-mouth bottle, put it in a container and cool it to room temperature, take out the mesh bag and weigh it (W).
A.4.5 Calculation of test results
The gel content of the sample is calculated by the following formula
Gel content x 100%
Where:
Stainless steel wire mesh bag: Unit: g:
W—weight of sample and mesh bag, unit:
W—weight of sample and mesh bag after drying, unit:2. Boil vigorously for 10 minutes or 10% ethanol to ensure good solvent vibration: when using 1000% reagent, the boiling speed is preferably 20-40 drops of liquid per minute on the condenser. The sample is collected in 10% ethanol for 6 hours and 121 should be collected in 10% ethanol. Note: The main point is that the sample can be collected within the specified time. This can be achieved by shortening the collection time based on experience. The shortened collection time needs to be reported. For the load test, the extraction should be carried out according to the specified time. 4.3.5.3 At the same time, the mesh bag containing the sample shall be immediately heated to 150°C in a vacuum oven and dried under an air pressure of at least 710 m3/s to constant weight. Cool and weigh (if the sample absorbs moisture, the sample shall be cooled in a desiccator before weighing). 4.3.6 Calculation of test results The gel content of the sample shall be calculated according to the following formula: Wherein: Gel content - % x 100% - weight of the stainless steel wire mesh bag, in g: W - weight of the wire mesh bag and the net, in g: W - weight of the sample and the net after extraction and drying, in g. 4 Test method II 4.4.1 Test instrument ||JB/T10437--2004
) Analytical balance, accuracy 0.Jmg
b) Air box, temperature control 2
) Vacuum drying box:
d) 1Xml, ground mouth:
stainless steel wire mesh with a hole width of 12m
for tenderizer
A.4.2 Test specimens
At least two samples should be tested: each sample contains (0.500±0.020)% of the measured particles prepared according to A.2.1: the weighing accuracy is 0.001g and is not treated under the conditions specified in A2.2. A.4.3 Test case
The test should be carried out in a standard laboratory atmosphere of (23±2) and relative humidity of [5±5)%. A.4.4 Test steps
Make a stainless steel wire into a 40 mm × 4 mm square bag and weigh it (W>). Put about 0.5 g of the sample into a stainless steel mesh bag and weigh it (pieces). Put the stainless steel wire containing the sample into a sealed door and pour a layer of methyl ether until the liquid is filled to more than 10 mm at the bottom. Put it in a sealed bottle and place it in an air box at a temperature of 110°C for 24 hours. Take out the grinding bottle and open the cover. Put it in an air oven at 10 At 77°C, air dry for 24 hours. Take out the ground-mouth bottle, put it in a container and cool it to room temperature, take out the mesh bag and weigh it (W).
A.4.5 Calculation of test results
The gel content of the sample is calculated by the following formula
Gel content x 100%
Where:
Stainless steel wire mesh bag: Unit: g:
W—weight of sample and mesh bag, unit:
W—weight of sample and mesh bag after drying, unit:
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