Test principle of horizontal flammability tester

Brief Introduction of GB8410 Horizontal Combustibility Tester

The burning rate horizontal flammability tester obtains the flame spread trend and flame spread speed of the material when it burns by testing the time required to burn a certain distance, classifies the flammability of the product, and evaluates the flame retardant performance of the material. It is used to test the relative burning rate and flame retardancy of textiles, especially automotive interior decoration fabrics. It can be equipped with a fume hood and a fire extinguishing device to achieve a complete combustion test.

Test Principle

1. This equipment provides a flaming combustion source, manually adjusts the height of the flame value standard, and then automatically operates the flame to ignite and extinguish.

2. When the flame acts on the sample, observe and record the combustion phenomenon. Use a timer to time the combustion.

The Automobile Interior Parts Flammability Tester/Horizontal Flammability Tester tests the relative burning rate and flame retardancy of textile fabrics, clothing, tents, especially automobile interior fabrics.

1. Test principle:

Clamp the sample horizontally on a U-shaped bracket. Ignite the free end of the sample with a flame of a specified height in a combustion box for 15 seconds. Determine whether the flame on the sample goes out, or when it goes out, as well as the distance the sample burns and the time it takes to burn that distance.

2. Test specimen:

1. Shape and size

Standard specimen shape and size. The thickness of the specimen is the thickness of the part, but not more than 13mm. When comparing the combustion performance of different types of materials, the specimens must have the same size (length, width, thickness). Usually, when sampling, the specimens must have the same cross-section along the entire length. When the shape and size of the part are not sufficient to make a standard specimen of the specified size, the following minimum size specimens should be guaranteed, but they must be recorded:

a) If the width of the part is between 3 mm and 60 mm, the length should be at least 356 mm. In this case, the specimen should be made as close to the width of the part as possible.

b) If the width of the part is greater than 60 mm, the length should be at least 138 mm. In this case, the possible burning distance is equivalent to the distance from the marking line to the flame extinguishing or the distance from the beginning of the marking line to the end of the specimen.

c) If the part width is between 3mm and 60mm and the length is less than 356mm, or the part width is greater than 60mm and the length is less than 138mm, it cannot be tested according to this standard; specimens with a width less than 3mm cannot be tested according to this standard.

2. Sampling

At least 5 specimens should be taken from the tested part. If there are materials with different burning speeds in different directions, specimens should be cut in different directions, and 5 (or more) specimens should be tested separately in the combustion box. The sampling method is as follows:

a) When the material is supplied in full width, samples should be taken that include the full width and are at least 500 mm long, and 100 mm of material should be cut off from the edge, and then samples should be taken evenly and equidistantly from each other on the remaining part.

b) If the shape and size of the part meet the sampling requirements, the specimen should be cut from the part.

c) If the shape and size of the part do not meet the sampling requirements, but the test must be carried out according to this standard, a standard sample (356mm×100mm) with the same material and process as the part can be made, and the thickness is the minimum thickness of the part and shall not exceed 13mm for testing. This test result cannot be used for identification, certification, etc., and the sample preparation situation must be noted in the test report.

d) If the thickness of the part is greater than 13 mm, mechanical cutting should be used from the non-exposed surface so that the thickness of the specimen including the exposed surface is 13 mm.

e) If the thickness of the part is not uniform, mechanical methods should be used to cut it from the non-exposed surface to make the thickness of the part uniform to the minimum thickness.

f) If the part is bent and a flat test specimen cannot be obtained, the flat part should be taken as much as possible, and the specimen arch height should not exceed 13mm; if the specimen arch height exceeds 13mm, a standard specimen (356mm×100mm) with the same material and process as the part should be made, and the thickness should be the minimum thickness of the part and should not exceed 13mm for testing.

g) Laminated composite materials should be treated as a single material for testing, and the sampling method is the same as above.

h) If the material is composed of several layers but is not a laminated composite material, all single materials in each layer within 13mm thickness from the exposed surface shall be sampled for testing. The interface between material A and material B is not bonded, so material A shall be tested alone. Material B is within 13mm thickness and is tightly combined with material C, so materials B and C shall be treated as a laminated composite material and 13mm shall be cut for testing.