GB/T 5169.8-1985 Fire hazard test for electrical and electronic products - Evaluation of test procedures - Examples and interpretation of test results - Comments on combustion characteristics and test methods

GB/T 5169.8-1985 Fire hazard test for electrical and electronic products. Test procedure examples and test result interpretation. Comments on combustion characteristics and test methods. GB/T5169.8-1985 standard download decompression password: www.bzxz.net

1 Introduction
National Standard of the People's Republic of China
Fire hazard testing for electricand electronic products
Examples of fire hazard assessmentprocedures and interpretation of resultsCombustion characteristics and surueyof test methods for their determinationUDC 621.3.002.6
:53848序.001.
.4 536.662.001.4
GB 5169.8—85
Combustion is a process that describes many interactions in a system. The relationships between them are usually very complex and can be analyzed only as partial and conceptually clear states.
Fire testing is to measure or assess the response of materials, products, structures or systems to one or more ignition modes. The results of the fire test are factors that must be considered in assessing and controlling fire hazards. This standard is equivalent to the first edition of the international standard IEC695-3-1 (1984). 2 Hazard concept
It is necessary to fully analyze and determine whether there is a fire hazard in a certain material, product, structure or system, and explain which properties of the item cause the fire hazard. The test items that need to be carried out are determined according to the range of combustion characteristics. These tests assess the reactions of various characteristics of the item to various stages of fire.
3 The significance and scope of combustion characteristic tests
The combustion characteristic test is to test the performance of standard samples. In most cases, the given data is a relative comparison of the combustion performance of materials. The data given by this test does not represent other conditions that the test sample may be subject to. The combustion characteristic test usually does not take into account the design, actual use, installation and environmental conditions of the product. However, these are the basic conditions for the assessment of the fire hazard of the product. When the test design simulates as much as possible the state to which the material, product structure or system is exposed in actual use (including normal use, misoperation or failure that can be estimated in advance), this test can provide the necessary information and confirm whether the product can meet the performance required for fire hazard assessment in actual use.
Main contents of combustion characteristicsbZxz.net
In most cases, the main combustion performance of the sample includes one or more of the following combustion characteristics; 4.1 Ignition rate: a measure of the ease of ignition of the test sample under the influence of an external heat source. 4.2 Flame spread (flame propagation): a measure of the extent to which the flame spreads along the surface of the test sample, expressed in length or speed. When the ignition source is removed, the burning length can usually indicate the self-extinguishing property of the test sample itself. Burning drops will cause the flame to extend to the outside of the sample. When the test measures the flame spread, this characteristic is usually also measured. National Bureau of Standards Published on April 26, 1985
1986-02 01 Implementation
GB5169.8—85
4.3 Release heat: The measure of heat energy released when a material burns. Heat release rate is also an important factor in flame spread. 4.4 Smoke (gas) release: The measure of smoke (or gas) released when a test sample is heated in a fire or a fire source. Gas and smoke release tests assess whether there will be dangers caused by corrosion of electrical and electronic equipment or adverse escape (thick smoke) or toxic effects (properties).
The release of gas in a single state may also lead to explosion hazards. Note: Combustibility is a relatively A complex scale that combines the ignition and flame spread characteristics that determine the rate of fire development. It depends on the chemical composition and physical structure of the material and is sensitive to temperature and the presence of oxygen. 5. Overview of test methods
This review of test methods includes standards and draft standards for combustion characteristics tests specified by the International Electrotechnical Commission (IFC) and the International Organization for Standardization (ISO).
Note: Due to the intersection of electrical and other technical fields, electrical and electronic products are often found on the surfaces of building materials, furniture and furnishings, and occupy a large proportion of the surface. Bacteria may accumulate or extend on its surface, or pass through the cross-section and structure of the building. In this case, appropriate test methods within the technical scope of ISO may also be used for certain electrical products. Therefore, this review is not limited to the methods specified in [EC standards. 5.1 Ignition properties
IEC92-101 standard: Part 101 of ship electrical installations, definitions and general technical requirements, 3.1.1 Non-flammability test! ISO871: Plastics - Determination of the flammable gas release temperature (decomposition temperature) by a small powdered test sample. ISO11 82: Fire test for building materials - non-flammability test 5.2 Fire spread
IFC92-101 standard, part 101 of ship electrical installation: definitions and general technical requirements, 3.1.2 flame retardant test! IEC249-1 standard: substrate for printed circuit boards, part 1 test method; IEC707 standard: test method for evaluating the flammability of solid electrical insulating materials exposed to ignition sources; ISO181: plastics - evaluation of the burning characteristics of small test samples of hard plastics in contact with hot rods; ISO/DIS* 1210-2: Plastics—Evaluation of the flammability of rod-shaped plastics [ISO/D1S*1326, Plastics—Evaluation of the flammability of film and sheet-shaped plastics, ISO3582: Foam plastics and foam rubber materials—Laboratory evaluation of the small flame combustion characteristics of small test specimens, [SO3795: Vehicles—5.3 Heat release—Evaluation of the combustion characteristics of automotive interior materials; ISO1716: Building materials—5.4 Smoke (gas) release 5.4.1 Smoke concentration Note, reaction to fire 92 is under consideration.
Determination of latent heat:
Smoke generated by solid materials (NBS chamber DP5659) and smoke generated by building materials (ISO box DP5924), [SO/TC5.4.2 Toxicity of smoke (gas)
ISO/TR6543: Tests for measuring the hazard of corrosion in fire. 5.4.3 Hazards caused by corrosion
IEC754-1 standard: Test for the release of gases during the combustion test of cables, Part 1 Determination of the amount of halogen acid released by polymeric materials of cables during combustion.
5.4.4 Hazards caused by explosion
IEC79-4 standard: Electrical appliances in explosive atmospheres, Part 4 Test method for ignition temperature. IFC79-4A standard: First supplement, table for determining ignition temperature. ·Draft international standard.
General requirements:
GB 5169.8-85
ISO.TR 384 Fire reaction test for building materials. 15OTR6585: Hazards and test design and terms of use
International Standard Number
IS0871
IEC92-101
ESQ1i82
IEC707
IEC92-t1
IEC249-1
ISo181
JSO/DIS
1202-2
ISO/DIS
[SO35B2
[SO3795
Release of heat
Liberation
ISO1716
IEC754-
(in press)
IEC79-4
GB 5169.8-85
Appendix A
Summary of international standards for combustion characteristics test
(reference)
Scope of application, test sample
Plastics, 1 Island powder material
In the cabin, non-combustible materials are required
50×20×30mm strips
Building materials, non-combustible materials are required,
Ring diameter d=45mm, height h
Solid insulating materials, material classification;
Method BH: 125×10×4m
Methods FH and FV,
125 × 13 × 3 m
Methods H and FH, horizontal test
Method FV: vertical test sample
Materials requiring flame retardancy for ship installation and electrical equipment testing, 120×10×3~
10mm rods
Printed circuit board substrates, quality control,
Rod and strip samples
Plastics, rigid plastics, 120~130
×10 × 4F
Plastics. 80 × 10 ~ 15 × 3 ~
heat care, weak and severe degree
hot copper plate increases the leakage degree in turn,
heating feeder chamber, 750C constant temperature,
10min fire baking
heating furnace, 750℃ constant temperature 20min
BH, hot rod 955r: 3 min,
Bensen burner 25mm flame
30s water test
FV: Bunsen burner 2nmm flame roasting,
2×105, vertical test
Bunsen burner 125mm flame,
5×155, 45° tilt
IEC707 [ISO/R1326] standard FH and FV methods
IEC707 standard BH method Method
Bunsen burner 100 m flame, 60s,
horizontal test
Plastics, film and sheet, strip, 250
x25mm×thickness
Foam plastics and rubber, 150×50×
5~13mm sample
Automobile gun materials, 356×100 m
×thickness
Grinded powdered building materials
Individual components in electrical structures, 0.5
～ 1 g material
Electrical appliances in explosive atmosphere, liquid or gas sample in
Bunsen burner, 25mm flame 155,
vertical test
gas lamp, 38mm flame 60s, water
Bunsen burner, 38mm flame 15s, water
Horizontal test
gas cylinder calorimeter
tubular combustion guard combustion, temperature rises to
800℃, 20min
in hot air combustion furnace, long-necked flask
test. Ignition extension band is 5min
Combustion characteristics, test properties
Minimum decomposition temperature, Combustible gas
Continuous
Release of flammable gas
Temperature rise and duration of flame
BH, average burning rate and length
FH, average burning rate and length
FV, average burning time of burning length 75mm, burning droplets
Average burning time of burning length 60mm
Average burning time, evaluated burning
rate, burning droplets
Average burning rate and length
Average burning rate and length
Average burning rate and length
Semi-average burning time and length
Combustion head
Latent heat value k J / kg
Hydrohalic acid nitric acid titration egg
Ignition temperature of chemically pure vapor
or gas in air at atmospheric pressure
18-189,1-8
This standard is proposed by the National Technical Committee for Environmental Conditions and Environmental Standardization of Electrical and Electronic Products (abbreviated as the Environmental Cup Committee). This standard was drafted by the Fire Hazard Working Group of the Environmental Standardization Committee. The main drafter of this standard is Liang Xingcai of the Guangzhou Electric Science Research Institute of the Ministry of Machinery Industry
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