Some standard content:
GA303--2001
Chapter 3, 3.1, 3.2 and Chapter 5, 5.1, 5.2 of this standard are recommended, and the rest are mandatory. This standard is mainly based on the existing standards of my country's GB8624-1997 "Classification Method for Combustion Performance of Building Materials", GB/T10802-1989 "Soft Polyurethane Foam Plastics", GB8410-1994 "Combustion Characteristics of Automobile Interior Materials", GA159-1997 "General Technical Conditions for Water-Based Flame Retardant Treatment Agents", Railway Industry Standard TB/T2402-1993 "Flame Retardant Requirements for Non-Metallic Materials of Railway Passenger Cars", and also refers to the relevant standards of the United States FMVSS571.302 "Combustion Characteristics of Automobile Interior Materials", Japanese Industrial Standard JISD1201--1997 "Test Method for Combustion Performance of Organic Materials for Automobile Carriages", and is formulated in combination with the actual level of my country's soft flame retardant polyurethane foam plastics.
Appendix A and Appendix B of this standard are the appendices of the standard. This standard was proposed by the Fire Department of the Ministry of Public Security of the People's Republic of China. This standard is under the jurisdiction of the Seventh Technical Committee of the National Fire Protection Standardization Technical Committee. This standard was drafted by the Sichuan Fire Science Research Institute of the Ministry of Public Security. The main drafters of this standard are Su Dongliang, Li Haizhou and Huang Ruchen. 369
1 Scope
People's Republic of China Public Security Industry Standard Soft Flame Retardant Polyurethane Foam Plastics
Soft fire retardant polyurethane foam plasticsGA 303—2001
This standard specifies the classification and definition, technical requirements, test methods, inspection rules, packaging, marking, transportation and storage of soft flame retardant polyurethane foam plastics.
This standard is applicable to polyether soft flame retardant polyurethane foam plastics and polyester soft flame retardant polyurethane foam plastics. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T2406-1993 Test method for burning performance of plastics Oxygen index method GB/T8332-1987 Test method for burning performance of foam plastics Horizontal burning method GB/T8333-1987
Test method for burning performance of rigid foam plastics Vertical burning method GB8410-1994 Combustion characteristics of automotive interior materials GB/T8627-1999 Test method for smoke density of burning or decomposition of building materials GB/T 10802-1989
Soft polyurethane foam plastics
TB/T 2402-1993
Flame retardant requirements for non-metallic materials of railway passenger cars 3 Definitions
This standard adopts the following definitions.
3.1 Polyether soft fire retardant polyurethane foam plastics are open-cell soft foam plastics made by the reaction of polyether polyol and toluene diisocyanate, and then subjected to flame retardant treatment. 3.2 Polyester soft fire retardant polyurethane foam plastics are open-cell soft foam plastics made by the reaction of polyester polyol and toluene diisocyanate, and then subjected to flame retardant treatment. 4 Classification
4.1 According to the different production raw materials, it is divided into two major types: polyether soft flame retardant polyurethane foam plastics [JM(Z)] and polyester soft flame retardant polyurethane foam plastics [JZ(Z)].
4.2 According to the different use fields, it is divided into soft flame retardant polyurethane foam plastics for construction and other fields, soft flame retardant polyurethane foam plastics for railway passenger cars, and soft flame retardant polyurethane foam plastics for automobiles. 5 Technical requirements
5.1 Appearance quality
Should meet the requirements of Table 1.
Approved by the Ministry of Public Security of the People's Republic of China on July 23, 2001370
Implemented on December 1, 2001
Surfaces on both sides
5.2 Dimensional deviation
Morphological and yellow core are allowed
GA 303—2001
Table 1 Appearance quality requirements
No through holes larger than mm and pores larger than 0 mm are allowed. The total length of the closed cracks per square meter is less than 200 mm. The oblique skin width on both sides of the sheet does not exceed 40 mm. Severe pollution is not allowed
Should meet the requirements of Table 2.
Table 2 Allowable value of dimensional deviation
Length, width
Basic size
≤1000
1 001~2 000
2 001 ~3 000
3001～4 000
5.3 Physical and mechanical properties
Shall conform to the requirements of Table 3.
Tensile strength/kPa
Uniqueness/（%)
75% compression permanent deformation/(%)
Rebound rate/（%)
Tear strength/(N/cm）
Hardness at 25% depression/N
Depression performance
Moisture absorption/（%)
Combustion performance
Hardness at 65% depression/N
65%/25% Depression ratio
Basic size
80~149
Table 3 Physical and mechanical properties
≥160
≥250
According to the different application fields of soft flame-retardant polyurethane foam plastics, its combustion performance shall comply with the provisions of Table 4, Table 5 and Table 6 respectively 371
Oxygen index/(%)
GA 303--2001
Table 4 Combustion performance and graded combustion performance of soft flame-retardant polyurethane foam plastics for use in construction and other fields
Vertical burning test
Horizontal burning test
Smoke density grade (SDR)
Oxygen index/(%)
45° angle burning test
Average burning time/s
Average burning height/mm
Average burning time/s
Average burning range/mm
Table 5 For railway passenger cars Combustion performance of soft flame-retardant polyurethane foam plastics Combustion performance
Flame retardant grade
Table 6 Combustion performance and classification of soft flame-retardant polyurethane foam plastics for automobiles Grade
Combustion performance
Average burning speed/(mm/min)
Horizontal burning test
Test method
Average burning distance/mm
Average self-extinguishing time/s
Determination of appearance quality
According to the provisions of 5.2 of GB/T10802--1989. 6.2 Determination of dimensional deviation
According to the provisions of 5.1 of GB/T10802-1989. 6.3 Determination of tensile strength and elongation
Q: Grade
According to the provisions of 5.3.4 of GB/T10802-1989. 6.4 Determination of 75% compression set
Perform according to the provisions of 5.3.5 of GB/T10802-1989. 6.5 Determination of rebound rate
Perform according to the provisions of 5.3.6 of GB/T10802-1989. Determination of tear strength
Perform according to the provisions of 5.3.7 of GB/T10802-1989. 6.7 Determination of indentation performance
Perform according to the provisions of 5.3.8 of GB/T10802-1989. 6.8 Determination of moisture absorption
Put the test piece made according to the provisions of Appendix A (Standard Appendix) in an oven at 50℃±2C and dry for 24h, then take it out and weigh it (G,) with an accuracy of 0.01g. Then place the specimen in a constant temperature and humidity chamber at a temperature of 40℃±2℃ and a relative humidity of 80%±5%. After 24 hours, take it out and immediately weigh the mass (Gz) of the specimen after moisture absorption, accurate to 0.01 g. Calculate the moisture absorption rate AG according to the following formula, and take the average value of the test results of three specimens as the moisture absorption rate of the specimen.
6.9 Determination of oxygen index
GA 303-—2001
AG = G=G × 100%
Put the specimen made according to Appendix A in an environment with a temperature of 23℃±2C and a relative humidity of 50%±5% for 24 hours, and then measure it according to the provisions of GB/T2406.
6.10 Vertical combustion test
Perform according to the provisions of GB/T8333.
6.11 Horizontal combustion test
6.11.1 The soft flame retardant polyurethane foam plastics for use in the construction and other fields shall be tested in accordance with the provisions of GB/T8332. 6.11.2 The soft flame retardant polyurethane foam plastics for use in automobiles shall be tested in accordance with the provisions of GB8410. 6.1245° angle burning test
The test shall be carried out in accordance with the provisions of 6.2 of TB/T2402-1993. 6.13 The determination of smoke density rating (SDR)
The test shall be carried out in accordance with the provisions of GB/T8627.
7 Inspection rules
7.1 Type inspection
7.1.1 All technical index items listed in Table 1, Table 2, Table 3 and Table 4 of this standard are type inspection items for soft flame retardant polyurethane foam plastics for use in the construction and other fields.
7.1.2 All technical index items listed in Table 1, Table 2, Table 3 and Table 5 of this standard are type inspection items for soft flame retardant polyurethane foam plastics for railway passenger cars.
7.1.3 All technical indicators listed in Table 1, Table 2, Table 3 and Table 6 of this standard are type inspection items for soft flame retardant polyurethane foam plastics for automobiles.
7.1.4 When any of the following circumstances occurs, the product shall be subject to type inspection. The number of products sampled during product type inspection shall be no less than 10m. a) During the trial type identification of new products or old products for mass production; b) After formal production, when the formula, process and raw materials of the product have changed significantly; c) When the product is stopped for more than one year and then resumed; d) When continuous production exceeds two years;
e) When the national quality supervision agency proposes a requirement for type inspection. 7.2 Factory inspection
7.2.1 The factory inspection items for soft flame retardant polyurethane foam plastics for construction and other fields and soft flame retardant polyurethane foam plastics for railway passenger cars are appearance quality, dimensional deviation, tensile strength, elongation, 75% compression permanent deformation, rebound rate, tear strength, depression performance and oxygen index. 7.2.2 The factory inspection items for soft flame-retardant polyurethane foam plastics for automobiles are appearance quality, dimensional deviation, tensile strength, elongation, 75% compression permanent deformation, rebound rate, tear strength, depression performance and horizontal burning test. 7.2.3 Each batch of products produced and shipped shall be subject to factory inspection. Products with the same raw materials, the same formula, the same model and the same process conditions shall be a batch of no more than 500m2.
7.3 Sampling method and test piece preparation
7.3.1 For square sheets with a length of not less than 1300mm and a width of not less than 1000mm, two sheets shall be randomly selected from each batch of samples as a group of specimens. Three groups shall be selected, of which two groups shall be used for re-inspection. Except for the two specimens of a group of specimens for appearance quality and dimensional deviation, which shall be inspected, one sheet (two sheets for those with a length less than 1800mm) may be selected from the group of specimens for the other performance tests. The test pieces shall be cut according to the requirements of Appendix A and Appendix B (Appendix of the Standard) Figure B1 (or Figure B2).
7.3.2 For square sheets and special-shaped products with a length of less than 1300mm and a width of less than 1000mm, three groups of sufficient specimens shall be randomly selected from each batch of samples, of which two groups shall be used for re-inspection. For appearance quality and dimensional deviation, two specimens shall be selected from one group of specimens for inspection. For the inspection of other properties, an appropriate number of specimens may be selected from the group of specimens according to the specimen size and number specified in Appendix A and the specimens shall be cut 50mm away from the edge of the specimen.
7.4 Rules for judging the inspection results
The qualified judgment of the product batch shall be determined according to the judgment number specified in Table 7. If the number of unqualified single items does not exceed the number of single items and the total number of unqualified items does not exceed the total number of items, the product shall be judged as qualified.
Table 7 Number of qualified batches
Appearance quality
Dimensional deviation
Tensile strength
Elongation
75% compression permanent deformation
Rebound rate
Tear strength
Hardness at 25% depression
Hardness at 65% depression
65%/25% depression ratio
Moisture absorption
Oxygen index
Vertical burning test
Horizontal burning test
45° angle burning test
Smoke density level
7.5 Retest
Average burning time
Average burning height
Average burning (self-extinguishing time
Average burning range (distance)
Average burning speed
Number of samples
(average value)
Factory inspection A.
Type inspection A.
7.5.1 was judged as non-compliant For products that are unqualified, two groups of re-test samples of the batch are used to re-test the unqualified items. If both groups of re-test samples are qualified, the batch is considered qualified.
7.5.2 For batches that are judged unqualified due to unqualified appearance quality and dimensional deviation during factory inspection, it is allowed to inspect the batch of products piece by piece. Products that pass the inspection are still considered qualified.
8 Packaging, marking, transportation, storage
8.1 Products are packaged in plastic bags, woven bags, etc. or in bulk. 8.2 Products should be accompanied by product markings, qualified marks, Specifications, grades, batch numbers, production dates, manufacturer names, factory addresses and relevant waterproof, moisture-proof and fireproof signs.
8.3 Products should be stacked in clean, dry and well-ventilated warehouses according to different specifications and grades, and separated from the ground by pads. They should not be close to heat sources or contact with chemicals.
8.4 Products should be protected from rain, moisture and sunlight during transportation and storage, and should avoid long-term pressure and mechanical damage. 374
See Table A1 for specimen size, quantity and number. GA 303—2001
Appendix A
(Appendix to the standard)
Test piece dimensions, quantity and cutting position
Table A1 Test piece dimensions, quantity and number
Test items
Tensile strength
Elongation
75% compression permanent deformation
Rebound rate
Tear strength
Moisture absorption
Oxygen index
Hardness at 25% depression
Hardness at 65% depression
65%/25% depression ratio
Vertical burning test
Construction and other fields
Horizontal burningbzxz.net
Burning test
Automotive industry
15° angle burning test
Smoke density level
Test piece size
Length: 152
Width: 25
Thickness: 10～15
Length: 50±1
Width: 50±1
Thickness: 25±1
Length: 100±5
Width: 100±5
Thickness: 50±2
Length: 150±1
Width: 25±0 .5
Thickness: 25±0.5
Length: 380+20
Width: 380+20
Thickness: 50±2
Length: 200±10
Width: 200±10
Thickness: 50+2
Length: 80150
Width: 10±0.5
Thickness: 10±0.5
Length: 250±1
1Width: 20±1
Thickness: 20+1
Length: 150±1
Width: 5 0±1
Thickness: 13+1
Length: 356±2
Width: 100±1
Thickness: 13+1
Length: 257±2
Width: 182±1
Thickness: 13+1
Length, width and thickness are all 25
One specimen is used to measure two items at the same time
Thickness <50mm should be superimposed to make it as close to 50mm as possible
One specimen is used to measure three items at the same time
Use a metal ruler and a vernier caliper with an accuracy of 0.1mm to measure the size.
Thickness <50mm, the specimen thickness is the same as the original thickness. Thickness <20mm, the specimen thickness is the same as the original thickness
Thickness <13 mm,The thickness of the test piece is the same as the original thickness. If the thickness is less than 13 mm, the test piece should be superimposed so that it is as close as possible to 25 mm. See Figure B1 and Figure B2 for the cutting position of the test piece. Appendix B of GA 303--2001 (Annex B of the standard) Diagram of cutting position of the test piece Unit: mm Test piece with length ≥ 1800 mm and width ≥ 1500 mm Unit: mm ≥ 712 (8) ≥ 212 Figure B2 Test piece with length < 1800 mm and width ≥ 1000 mm 376
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