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GB/T 5169.12-2013: Fire hazard testing for electric and electronic products -- Part 12: Glowing/hot-wire based test methods -- Glow-wire flammability index (GWFI) test method for materials
GB/T 5169.12-2013
Fire hazard testing for electric and electronic products - Part 12.Glowing/hot-wire based test methods - Glow-wire flammability index (GWFI) test method for materials
ICS 13.220.40;29.020
K04
National Standards of People's Republic of China
Replace GB/T 5169.12-2006
Fire hazard test for electric and electronic products
Part 12.Glow Wire/Hot Wire Basic Test Method
Glow-wire flammability index (GWFI) test method for materials
materials
(IEC 60695-2-12.2010,Firehazardtesting-Part 2-12.Glowing/hot-wire
materials,IDT)
Released on.2013-12-17 Implemented on.2014-04-09
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Issued by the National Standardization Administration of China
Fire hazard test for electric and electronic products
Part 12.Glow Wire/Hot Wire Basic Test Method
Glow-wire flammability index (GWFI) test method for materials
1 Scope
This part of GB/T 5169 specifies in detail the measurement on samples of solid electrical and electronic insulating materials or other solid materials.
Glow wire test method for hot wire flammability index (GWFI).
This test method is a material test conducted on a series of standard samples. The data obtained together with the materials from IEC 60695-2-13
Together with the data obtained by the glow-wire ignition temperature (GWIT) test method, in accordance with the GB/T 5169.9-2013 preselection procedure, assess whether the material is
Meet the requirements of GB/T 5169.11-2006.
Note. As a result of the fire hazard assessment, a series of appropriate flammability and ignitability preselection tests can reduce the number of finished product tests.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document.
GB/T 5169.9-2013 Fire hazard test of electric and electronic products Part 9.Guidelines for fire hazard assessment, pre-selected test procedures
(IEC 60695-1-30.2008, IDT)
GB/T 5169.10-2006 Fire hazard test for electric and electronic products Part 10.Glow wire/hot wire basic test method
Hot wire device and general test method (IEC 60695-2-10.2000, IDT)
GB/T 5169.11-2006 Fire hazard test for electric and electronic products Part 11.Glow wire/hot wire basic test method
Test method for glow-wire flammability of products (IEC 60695-2-11.2000, IDT)
GB/T 5471-2008 Compression molding of plastic thermosetting plastic samples (ISO 295.2004, IDT)
GB/T 9352-2008 Compression molding of plastic thermoplastic material samples (ISO 293.2004, IDT)
ISO 291.2008 Standard environment for plastic condition adjustment and testing (Plastics-Standardatmospheresforcondi-
tioningandtesting)
ISO 294 (all parts) Plastics-Injection molding of test samples of thermoplastic materials
specimensofthermoplasticmaterials)
ISO /IEC 13943.2008 Firesafety-Vocabulary
IEC 60695-2-13 Fire hazard test Part 2-13.Glow wire/hot wire basic test method Glow wire ignition temperature of materials
Degree (GWIT) test method (Firehazardtesting-Part 2-13.Glowing/hot-wirebasedtestmethods-Glow-
wireignitiontemperature(GWIT)testmethodformaterials)
3 Terms and definitions
The terms and definitions defined by ISO /IEC 13943.2008 apply to this document. For ease of use, some of them are copied below.
3.1
Combustion
The exothermic reaction of the substance with the oxidant.
Note. Burning usually emits a combustion stream, accompanied by flames and/or scorching heat.
[ISO /IEC 13943.2008, definition 4.46]
3.2
Flame (noun) flame (noun)
In a gaseous medium, rapid, spontaneous continuous, subsonic combustion is usually accompanied by luminescence.
[ISO /IEC 13943.2008, definition 4.133]
3.3
Flammability
Under specified conditions, materials or products have the ability to burn with flames.
[ISO /IEC 13943.2008, definition 4.151]
3.4
Glowing (noun)
Glow due to heat.
[ISO /IEC 13943.2008, definition 4.168]
3.5
Glowingcombustion
In the burning zone, solid materials burn without flames and glow.
[ISO /IEC 13943.2008, definition 4.169]
3.6
Ignition
Long-lasting ignition (not recommended).
< Usually> the beginning of combustion.
[ISO /IEC 13943.2008, definition 4.187]
3.7
Ignition
Long-lasting ignition (not recommended).
< Flame burning> Continue the beginning of the flame.
[ISO /IEC 13943.2008, definition 4.188]
3.8
Molten drip
The droplets produced by the softening or liquefaction of materials by heat.
Note. The drippings can be flaming or flameless burning.
[ISO /IEC 13943.2008, definition 4.232]
3.9
Preselection
The procedure for evaluating and selecting alternative materials, components, or assemblies for the manufacture of finished products.
[GB/T 5169.9-2013, definition 3.2]
3.10
Glow wire flammability index glow-wireflammability index; GWFI
The maximum temperature of the test material measured by this standardized test method when the following conditions are met.
a) It does not burn, or if it ignites, it extinguishes within 30s after removing the glow wire and it is not completely burned out; and
b) If there is molten dripping, it will not ignite the packaging tissue paper.
4 Specimen
4.1 Preparation of the sample
The sample should be made using appropriate ISO methods, such as. ISO 294 series standard injection method, GB/T 9352-2008 or
GB/T 5471-2008 compression molding method; or use the die-casting method to make the required shape. If the above method is not feasible, the representative of the material
Samples (for example. materials made with the same manufacturing process as molded product parts) are cut to obtain samples.
After making or cutting, use fine sandpaper to grind each cut surface of the incision smoothly, and carefully remove all dust and particles on the surface.
4.2 The size of the sample
The size of the plane part of the sample should be at least 60mm long and 60mm wide (inside the clamp), and provide all thicknesses that should be considered. Preferred thickness
Values include 0.1mm±0.02mm, 0.2mm±0.02mm, 0.4mm±0.05mm, 0.75mm±0.10mm, 1.5mm±
0.15mm, 3.0mm±0.2mm or 6.0mm±0.4mm.
Note. Generally, 15 specimens per thickness are sufficient to measure the glow-wire ignition temperature GWIT (see IEC 60695-2-13) and the glow-wire flammability index at the same time
GWFI.
4.3 Scope of formulation test
4.3.1 Overview
For different colors, thickness, density, molecular weight, type/direction of anisotropy, test with different additives, fillers and/or reinforcing agents
In the same way, the test results may be different. When the relevant parties agree to an agreement, the test procedures outlined in 4.3.2 and 4.3.3 can be used to assess their differences.
4.3.2 Density, melt fluidity and filler/reinforcing agent
Can provide samples containing all combinations of density, melt fluidity and filler/reinforcer content minimum and maximum, if the test results
If the same GWFI is obtained, it is considered that this range is representative. If the test results of all samples in the representative range
For the same GWFI, the evaluation should be limited to materials whose density, melt fluidity and filler/reinforcing agent content are the specified values. In addition, in order to determine
For the representative range of each GWFI value, samples with intermediate values of density, melt fluidity, and filler/reinforcing agent content should be tested. However, you can also
Some materials with specific density, melt fluidity and filler/reinforcing agent content are the most unfavorable as a representative of the intermediate value, without the need to carry out
Additional testing.
4.3.3 Color
When evaluating full-color samples, if the test results produce the same GWFI, the following samples are considered to be representative in the color range.
a) Does not contain colorants;
b) Contain the highest content of organic pigments/colorants/dyes and/or carbon black;
c) Contain the highest content of inorganic pigments; and
d) Contains pigments/colorants/dyes that are known to have an adverse effect on combustion characteristics.
5 devices
For the description of the test device, see Chapter 5 of GB/T 5169.10-2006.
The silk paper and wood board placed under the sample should meet the requirements of 5.3 of GB/T 5169.10-2006.
If all 3 samples can pass the test criteria specified in 10.1, 3 new samples should be used for the test again.
The temperature should be increased by 50K (for 900°C, it should be increased by 60K).
Use 3 new samples to repeat the test each time, and reduce the test temperature interval to 25K (for 960℃ should be 30K), until
Finally, it is close to the highest test temperature determined, that is, the test temperature at which all three samples can pass the test criteria specified in 10.1.
However, if one of the three samples fails to pass the test criteria specified in 10.1, there is no need to raise the temperature for the test.
Note 1.The lowest test temperature is 550℃, and the highest test temperature is 960℃.
Note 2.When the temperature is higher than 900 ℃, the temperature interval should be 60K and 30K.
Note 3.The recommended starting temperature for the test is 650℃.
9 Observation and measurement
9.1 Overview
The following observations and measurement results should be recorded.
9.2 Initial observation
After visual identification and inspection of the sample, the following records should be made.
a) A description of the tested material, including thickness, color, model and manufacturer;
b) Describe the method of sample preparation (when applicable);
c) If the direction of anisotropy is known to be related to the sample size, record the anisotropy; and
d) Condition adjustment condition of sample and silk paper before test.
9.3 Test observation
During the application of the glow wire and within 30s thereafter, the sample and the silk paper placed under it should be observed, and the following records should be made.
a) After removing the sample from the top of the glow wire, the longest duration of flame and/or flameless combustion of the sample is observed, tR (rounded to 0.5s);
b) The test temperature obtained according to Chapter 8;
c) If there is sample loss, record its total loss;
d) If the silk paper ignites, record the ignition; and
e) Other additional observations recorded during the negotiation between the parties to the agreement.
Note. If the measured value is 30.2s, it is recorded as 30.0s; if the measured value is 30.3s, it is recorded as 30.5s.
10 Evaluation of test results
10.1 Test criteria
If the sample does not ignite or meets all the following conditions, it is considered to be able to withstand this test.
a) After the top of the glow wire is removed from the sample, the maximum duration (tR) of flame and/or flameless combustion of the sample does not exceed 30s;
b) The sample is not burned out; and
c) The silk paper did not ignite.
10.2 Glow Wire Flammability Index
GWFI is the highest temperature at which 3 samples of corresponding thickness meet the 10.1 criterion.
When the material does not burn at the highest temperature in Table 1 (see IEC 60695-2-13), the GWFI test is not required.
Test procedures. The GWFI of the corresponding thickness of this material is 960°C.
GWFI shall be recorded as follows.
For example, for a 3.0mm thick sample, its GWFI temperature is 850°C, then the record is as follows.
GWFI.850/3.0
If the GWFI value corresponding to each thickness is different, record the GWFI value of each thickness.
When the thickness in a certain range corresponds to a certain GWFI value, it is considered that the GWFI value corresponds to the minimum and maximum thickness in the range.
And other preferred thicknesses.
11 Test report
The test report should include the following.
a) Mention this section;
b) The test temperature obtained from 8.3;
c) Observations and measurements obtained from Chapter 9; and
d) GWFI value obtained from 10.2.