Record No. Database Comprehensive Standard Standard Name Fireproof Material GB 8624-1997 Standard Type Standard Name (English) Standard Number Standard Issue Unit Standard Release Date Standard Implementation Date Standard Text Foreword This standard is a revision of GB8624-88. Non-equivalent to the technical content of the first part of the German standard DIN4102-81.
Compared with GB8624-88, this revised edition adds A-grade compound (sandwich) materials, and according to the specific conditions in China, it has increased the use of paving materials for specific purposes, curtain fabrics, wire and cable casing plastic materials. The specific provisions for foams for thermal insulation of pipes and pipes. If the above-mentioned special-purpose material is used as a wall or ceiling material, it must still be inspected and classified according to the provisions of Chapters 4 and 5 of this standard.
From the effective date of this standard, the original GB8624-88 is invalid.
This standard is proposed by the Ministry of Public Security
This standard is under the jurisdiction of the Seventh Committee of the National Fire Protection Standardization Technical Committee.
This standard was drafted by Sichuan Fire Science Research Institute of the Ministry of Public Security.
The main drafters of this standard: Qian Jianmin, Ma Xianglin, Lu Guojian.
This standard was first published in February 1988.
national standards of People's Republic of China
GB 8624-1997
Graded method for combustion performance of building materials instead of GB 8624-88
Classification of burning behaviour for building materials
1 Theme content and scope of application This standard specifies the evaluation and grading standards for the combustion properties of building materials.
This standard applies to all types of industrial and civil construction projects used in the construction materials and various decoration materials.
2 Reference Standards The following standards contain provisions that, through reference in this standard, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards will be revised and all parties using this standard should explore the possibility of using the latest version of the following standards.
GB/T2406-93 Test Method for Combustion Properties of Oxygen Index
GB/T2408-80 Test method for combustion performance of plastics - Horizontal combustion method
GB/T4609-84 Test method for combustion performance of plastics - Vertical combustion method
GB/T5454-85 Textile fabrics, Determination of combustion performance, Oxygen index method
GB/T5455-85 Textile fabrics - Determination of flame-retardant properties - Vertical method
GB/T5464-85 Test method for incombustibility of building materials
GB/T8332-87 foam combustion performance test method horizontal combustion method
GB/T8333-87 Test method for the combustion properties of rigid foams - Vertical combustion method
GB/T8625-88 Test method for flame retardancy of building materials
GB/T8626-88 Test method for flammability of building materials
GB/T8627-88 Smoke density test method for burning or decomposing building materials
Home washing and drying procedures used in the test of GB/T8629-88 textiles
GB/T11785-89 Determination of Critical Radiative Flux of Flooring Materials Radiant Heat Source Method
GB/T14402-93 Test method for combustion heat value of building materials
GB/T14403-93 Test method for heat release from combustion of building materials
3 Level and name of combustion performance of building materials The grade and name of combustion performance of building materials are shown in Table 1.
Table 1 Level and Name Level Name of Combustion Performance
A Non-combustible material
B1 Flame retardant material
B2 Combustible material
B3 Flammable Materials National Technical Supervision Bureau 1997-04-04 Approved 1997-10-01 Implementation
GB 8624-1997
4 Non-combustible Materials (Grade A)
4.1 Class A homogeneous material is tested according to GB/T 5464. Its fuel performance should be:
a) The average temperature rise in the furnace does not exceed 50 °C;
b) The average continuous burning time of the sample does not exceed 20s;
c) The average mass loss rate of the sample shall not exceed 50%.
4.2 Class A composite (sandwich) materials that meet the following requirements have a Class A combustion performance.
a) According to GB/T8625 test, the average remaining length of each set of specimens is ≥35cm (the remaining length of any specimen is >20cm), and the peak value of the average flue gas temperature for each test is ≤125°C, and the back of the specimen is not Any burning phenomenon;
b) Tested according to GB/T8627 with a smoke density rating (SDR) ≤ 15;
c) Tested in accordance with GB/T14402 and GB/T14403. The material calorific value is ≤ 4.2 MJ/kg, and the heat release per unit area of ​​the test piece is ≤ 16.8 MJ/m2;
d) The total non-lethal concentration LC0≥25mg/L of the material combustion smoke toxicity.
5 Combustible Materials (Level B)
5.1 The material of Class B1 material that meets the following requirements has a combustion performance class B1.
a) Tested according to GB/T8626, its combustion performance should meet the requirements specified in GB/T8626, and the phenomenon of ignition of filter paper by burning drips is not allowed;
b) According to GB/T8625 test, the average remaining length of each set of specimens is ≥ 15cm (the remaining length of any specimen is > 0cm), and the peak value of the average flue gas temperature for each test is ≤ 200°C;
c) Test according to GB/T8627 with a smoke density rating (SDR) ≤ 75.
5.2 B2 grade material is tested according to GB/T8626, its combustion performance should meet the requirements specified in GB/T8626, and the phenomenon of ignition of filter paper by burning drips is not allowed.
5.3 Class B3 materials do not belong to Class B1 and B2 flammable building materials, and their combustion performance is defined as Class B3.
6 Special provisions for certain special-purpose materials This standard stipulates the following for floor covering materials, curtain fabric textile materials, wire and cable bushing materials, and foam plastics used for thermal insulation of pipes. The corresponding test method determines the level of its combustion performance.
If the above material is used as a wall or ceiling material, it should still be inspected and classified according to the provisions of Chapters 4 and 5.
6.1 See Table 2 for the classification of the burning properties of the flooring materials.
GB 8624-1997
Table 2 Classification Test Method for Burning Performance of Flooring Materials Judgment Index Combustion Performance Level
GB/T11785 critical radiation flux≥0.45W/cm
2
B1
GB/T11785 critical radiation flux≥0.22W/cm
2
B2
6.2 Curtain Curtain Textile Materials
6.2.1 The classification of the burning properties of curtain fabrics is shown in Table 3.
Table 3 Classification test method for the burning performance of curtain fabric textile materials Judgement index Burning performance level
a) The damage length is ≤150mm;
b) Afterburning time ≤ 5s;
c) smoldering time ≤ 5s;
d) Oxygen index ≥ 32
B1
GB/T5454
GB/T5455 a) damage length ≤ 200mm;
b) Afterburning time ≤ 15s;
c) smoldering time ≤ 10s;
d) Oxygen Index ≥ 26
B2
6.2.2 Curtain screen fabrics that have been permanently fireproofed shall be washed and dried in accordance with the method specified in GB/T 8629 before performing the combustion performance test. The fabric washing procedure is preferably a program numbered 5A and the drying is preferably oven drying. The fire performance rating of this type of textile should be marked "washable".
6.3 Wire and cable bushing plastic materials The classification of the combustion performance of wire and cable bushing plastic materials is shown in Table 4. Wire and cable bushing materials of the same material and different in thickness may have the same material thickness as the intermediate thickness if the maximum thickness and the minimum thickness of the material meet the requirements of one of the grades in Table 4. If they cannot be satisfied at the same time, the most unfavorable value should be used as the basis for classification.
Table 4 Combustion performance of wire and cable bushing plastic materials Classification Material type Inspection method Judgment index Combustion performance level
GB/T2406
GB/T2408
GB/T8627
a) Oxygen index ≥ 32;
b) reach GB/T2408-80/I level;
c) Smoke Density Rating (SDR) ≤ 75
B1
Thermoplastic
GB/T2406
GB/T2408
a) oxygen index ≥ 26;
b) up to GB/T2408-80/II
B2
GB/T2406
GB/T4609
GB/T8627
a) Oxygen index ≥ 32;
b) reach FV-0 level;
c) Smoke Density Rating (SDR) ≤ 75
B1
Thermosetting plastic
GB/T2406
GB/T4609
a) oxygen index ≥ 26;
b) Achieve FV-I
B2
6.4 Foam plastics for pipe insulation
GB 8624-1997
For foamed products with a protective layer on the surface, the burning performance shall be determined in accordance with the requirements of Chapter 5.
See Table 5 for the classification of the combustion performance of foamed plastic products with no protective layer on the surface. For a foamed plastic article of the same material and different thickness, if the combustion performance of the material having the maximum thickness and the minimum thickness at the same time satisfies one of the grades in Table 5, the material of the intermediate thickness may also be confirmed as the grade. If they cannot be satisfied at the same time, the most unfavorable value should be used as the basis for classification.
Table 5 Classification test method for the combustion performance of foam insulation foam insulation
GB/T2406
GB/T8333
GB/T8627
a) Oxygen index ≥ 32;
b) The average burning time ≤ 30s, the average combustion height ≤ 250mm;
c) Smoke density rating (SDR) ≤ 75
B1
GB/T2406
GB/T8332
a) oxygen index ≥ 26;
b) The average burning time ≤ 90s, the average combustion height ≤ 50mm; B2
7 Special provisions for composite materials, surface coating materials, etc.
7.1 For the stereotyped composite building materials, regardless of their thickness or production process, they should be tested for the combustion characteristics of the final products and comprehensively evaluated.
7.2 The thickness of the coating or other finish (such as wallpaper) applied to the surface of the interior decorative substrate by painting, pasting or other methods on the site, ≤ 0.6mm or mass per unit area ≤ 300g/m2, irrespective of the finish layer The effect of its substrate's combustion characteristics and classification. If the thickness of the decorative layer exceeds 0.6 mm or the burning characteristics of the decorative substrate have a significant effect, the decorative surface should be prepared together with the substrate and tested to obtain a sample for comprehensive evaluation.
7.3 For materials with fireproof surfaces, the flammability classification shall be tested and evaluated with the treated material. The properties of fire-retardant coatings and flame retardants can be tested and evaluated in accordance with their relevant standards. This test and evaluation is not the basis and basis of this grading standard, but it can be used as a reference for the comprehensive evaluation of its combustion characteristics.
8 burning performance classification mark
8.1 Building materials that are inspected in accordance with this standard and comply with their requirements and requirements may be marked with the following signs based on their respective combustion performance levels:
GB8624 A
GB8624 B1
GB8624 B2
GB8624 B3
8.2 For materials classified according to the special provisions of Chapter 6 for combustion performance, their material name should be indicated in parentheses after the mark level. Such as GB8624 B1 (flooring material), GB8624 B2 (thermoplastics) and so on.
Compared with GB8624-88, this revised edition adds A-grade compound (sandwich) materials, and according to the specific conditions in China, it has increased the use of paving materials for specific purposes, curtain fabrics, wire and cable casing plastic materials. The specific provisions for foams for thermal insulation of pipes and pipes. If the above-mentioned special-purpose material is used as a wall or ceiling material, it must still be inspected and classified according to the provisions of Chapters 4 and 5 of this standard.
From the effective date of this standard, the original GB8624-88 is invalid.
This standard is proposed by the Ministry of Public Security
This standard is under the jurisdiction of the Seventh Committee of the National Fire Protection Standardization Technical Committee.
This standard was drafted by Sichuan Fire Science Research Institute of the Ministry of Public Security.
The main drafters of this standard: Qian Jianmin, Ma Xianglin, Lu Guojian.
This standard was first published in February 1988.
national standards of People's Republic of China
GB 8624-1997
Graded method for combustion performance of building materials instead of GB 8624-88
Classification of burning behaviour for building materials
1 Theme content and scope of application This standard specifies the evaluation and grading standards for the combustion properties of building materials.
This standard applies to all types of industrial and civil construction projects used in the construction materials and various decoration materials.
2 Reference Standards The following standards contain provisions that, through reference in this standard, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards will be revised and all parties using this standard should explore the possibility of using the latest version of the following standards.
GB/T2406-93 Test Method for Combustion Properties of Oxygen Index
GB/T2408-80 Test method for combustion performance of plastics - Horizontal combustion method
GB/T4609-84 Test method for combustion performance of plastics - Vertical combustion method
GB/T5454-85 Textile fabrics, Determination of combustion performance, Oxygen index method
GB/T5455-85 Textile fabrics - Determination of flame-retardant properties - Vertical method
GB/T5464-85 Test method for incombustibility of building materials
GB/T8332-87 foam combustion performance test method horizontal combustion method
GB/T8333-87 Test method for the combustion properties of rigid foams - Vertical combustion method
GB/T8625-88 Test method for flame retardancy of building materials
GB/T8626-88 Test method for flammability of building materials
GB/T8627-88 Smoke density test method for burning or decomposing building materials
Home washing and drying procedures used in the test of GB/T8629-88 textiles
GB/T11785-89 Determination of Critical Radiative Flux of Flooring Materials Radiant Heat Source Method
GB/T14402-93 Test method for combustion heat value of building materials
GB/T14403-93 Test method for heat release from combustion of building materials
3 Level and name of combustion performance of building materials The grade and name of combustion performance of building materials are shown in Table 1.
Table 1 Level and Name Level Name of Combustion Performance
A Non-combustible material
B1 Flame retardant material
B2 Combustible material
B3 Flammable Materials National Technical Supervision Bureau 1997-04-04 Approved 1997-10-01 Implementation
GB 8624-1997
4 Non-combustible Materials (Grade A)
4.1 Class A homogeneous material is tested according to GB/T 5464. Its fuel performance should be:
a) The average temperature rise in the furnace does not exceed 50 °C;
b) The average continuous burning time of the sample does not exceed 20s;
c) The average mass loss rate of the sample shall not exceed 50%.
4.2 Class A composite (sandwich) materials that meet the following requirements have a Class A combustion performance.
a) According to GB/T8625 test, the average remaining length of each set of specimens is ≥35cm (the remaining length of any specimen is >20cm), and the peak value of the average flue gas temperature for each test is ≤125°C, and the back of the specimen is not Any burning phenomenon;
b) Tested according to GB/T8627 with a smoke density rating (SDR) ≤ 15;
c) Tested in accordance with GB/T14402 and GB/T14403. The material calorific value is ≤ 4.2 MJ/kg, and the heat release per unit area of ​​the test piece is ≤ 16.8 MJ/m2;
d) The total non-lethal concentration LC0≥25mg/L of the material combustion smoke toxicity.
5 Combustible Materials (Level B)
5.1 The material of Class B1 material that meets the following requirements has a combustion performance class B1.
a) Tested according to GB/T8626, its combustion performance should meet the requirements specified in GB/T8626, and the phenomenon of ignition of filter paper by burning drips is not allowed;
b) According to GB/T8625 test, the average remaining length of each set of specimens is ≥ 15cm (the remaining length of any specimen is > 0cm), and the peak value of the average flue gas temperature for each test is ≤ 200°C;
c) Test according to GB/T8627 with a smoke density rating (SDR) ≤ 75.
5.2 B2 grade material is tested according to GB/T8626, its combustion performance should meet the requirements specified in GB/T8626, and the phenomenon of ignition of filter paper by burning drips is not allowed.
5.3 Class B3 materials do not belong to Class B1 and B2 flammable building materials, and their combustion performance is defined as Class B3.
6 Special provisions for certain special-purpose materials This standard stipulates the following for floor covering materials, curtain fabric textile materials, wire and cable bushing materials, and foam plastics used for thermal insulation of pipes. The corresponding test method determines the level of its combustion performance.
If the above material is used as a wall or ceiling material, it should still be inspected and classified according to the provisions of Chapters 4 and 5.
6.1 See Table 2 for the classification of the burning properties of the flooring materials.
GB 8624-1997
Table 2 Classification Test Method for Burning Performance of Flooring Materials Judgment Index Combustion Performance Level
GB/T11785 critical radiation flux≥0.45W/cm
2
B1
GB/T11785 critical radiation flux≥0.22W/cm
2
B2
6.2 Curtain Curtain Textile Materials
6.2.1 The classification of the burning properties of curtain fabrics is shown in Table 3.
Table 3 Classification test method for the burning performance of curtain fabric textile materials Judgement index Burning performance level
a) The damage length is ≤150mm;
b) Afterburning time ≤ 5s;
c) smoldering time ≤ 5s;
d) Oxygen index ≥ 32
B1
GB/T5454
GB/T5455 a) damage length ≤ 200mm;
b) Afterburning time ≤ 15s;
c) smoldering time ≤ 10s;
d) Oxygen Index ≥ 26
B2
6.2.2 Curtain screen fabrics that have been permanently fireproofed shall be washed and dried in accordance with the method specified in GB/T 8629 before performing the combustion performance test. The fabric washing procedure is preferably a program numbered 5A and the drying is preferably oven drying. The fire performance rating of this type of textile should be marked "washable".
6.3 Wire and cable bushing plastic materials The classification of the combustion performance of wire and cable bushing plastic materials is shown in Table 4. Wire and cable bushing materials of the same material and different in thickness may have the same material thickness as the intermediate thickness if the maximum thickness and the minimum thickness of the material meet the requirements of one of the grades in Table 4. If they cannot be satisfied at the same time, the most unfavorable value should be used as the basis for classification.
Table 4 Combustion performance of wire and cable bushing plastic materials Classification Material type Inspection method Judgment index Combustion performance level
GB/T2406
GB/T2408
GB/T8627
a) Oxygen index ≥ 32;
b) reach GB/T2408-80/I level;
c) Smoke Density Rating (SDR) ≤ 75
B1
Thermoplastic
GB/T2406
GB/T2408
a) oxygen index ≥ 26;
b) up to GB/T2408-80/II
B2
GB/T2406
GB/T4609
GB/T8627
a) Oxygen index ≥ 32;
b) reach FV-0 level;
c) Smoke Density Rating (SDR) ≤ 75
B1
Thermosetting plastic
GB/T2406
GB/T4609
a) oxygen index ≥ 26;
b) Achieve FV-I
B2
6.4 Foam plastics for pipe insulation
GB 8624-1997
For foamed products with a protective layer on the surface, the burning performance shall be determined in accordance with the requirements of Chapter 5.
See Table 5 for the classification of the combustion performance of foamed plastic products with no protective layer on the surface. For a foamed plastic article of the same material and different thickness, if the combustion performance of the material having the maximum thickness and the minimum thickness at the same time satisfies one of the grades in Table 5, the material of the intermediate thickness may also be confirmed as the grade. If they cannot be satisfied at the same time, the most unfavorable value should be used as the basis for classification.
Table 5 Classification test method for the combustion performance of foam insulation foam insulation
GB/T2406
GB/T8333
GB/T8627
a) Oxygen index ≥ 32;
b) The average burning time ≤ 30s, the average combustion height ≤ 250mm;
c) Smoke density rating (SDR) ≤ 75
B1
GB/T2406
GB/T8332
a) oxygen index ≥ 26;
b) The average burning time ≤ 90s, the average combustion height ≤ 50mm; B2
7 Special provisions for composite materials, surface coating materials, etc.
7.1 For the stereotyped composite building materials, regardless of their thickness or production process, they should be tested for the combustion characteristics of the final products and comprehensively evaluated.
7.2 The thickness of the coating or other finish (such as wallpaper) applied to the surface of the interior decorative substrate by painting, pasting or other methods on the site, ≤ 0.6mm or mass per unit area ≤ 300g/m2, irrespective of the finish layer The effect of its substrate's combustion characteristics and classification. If the thickness of the decorative layer exceeds 0.6 mm or the burning characteristics of the decorative substrate have a significant effect, the decorative surface should be prepared together with the substrate and tested to obtain a sample for comprehensive evaluation.
7.3 For materials with fireproof surfaces, the flammability classification shall be tested and evaluated with the treated material. The properties of fire-retardant coatings and flame retardants can be tested and evaluated in accordance with their relevant standards. This test and evaluation is not the basis and basis of this grading standard, but it can be used as a reference for the comprehensive evaluation of its combustion characteristics.
8 burning performance classification mark
8.1 Building materials that are inspected in accordance with this standard and comply with their requirements and requirements may be marked with the following signs based on their respective combustion performance levels:
GB8624 A
GB8624 B1
GB8624 B2
GB8624 B3
8.2 For materials classified according to the special provisions of Chapter 6 for combustion performance, their material name should be indicated in parentheses after the mark level. Such as GB8624 B1 (flooring material), GB8624 B2 (thermoplastics) and so on.
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