Horizontal flammability tester sampling principle test procedure

Horizontal flammability tester sampling principle test procedure

Test specimens.

1. Shape and size

Standard specimen shape and dimensions. The thickness of the specimen shall be the thickness of the part, but not more than 13 mm. when comparing the burning properties of different types of material, the specimens must have the same dimensions (length, width and thickness). Usually the sample must be taken so that it has the same cross-section along its entire length. When the shape and dimensions of the part are not sufficient to make a standard specimen of the specified size, the following small size specimens should be secured, but recorded.

a) If the width of the part is between 3mm and 60mm, the length should be at least 356mm. 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, where the possible burning distance corresponds to the distance from the marker line to the time when the flame is extinguished or from the beginning of the bar marker line to the end of the specimen.

c) If the width of the part is between 3mm ~ 60mm, and the length is less than 356mm or the width of the part is greater than 60mm, the length is less than 138mm, it can not be tested according to this standard; width of less than 3mm specimen also can not be tested according to this standard.

2. Sampling

At least 5 specimens should be taken from the part under test. If there are materials with different burning rates along different directions, the specimens should be intercepted in different directions and five (or more) specimens should be tested separately in the combustion chamber. Sampling is to be carried out as follows.