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Flammablity test principle analysis
Flammablity Test Principle Analysis
The flammablity test is a method of grading the combustion results after the combustion test under different conditions for various materials. Vertical combustion flammability grade UL94 is the most widely used flammability standard for plastic materials. It is used to evaluate the ability of a material to extinguish after being ignited.
There are many ways to determine the combustion rate, combustion time, droplet resistance and droplet combustion. Many values can be obtained for each material measured by color or thickness. When material of a product is selected, its UL grade shall meet the thickness requirement of the wall part of the plastic part. UL grades should be reported along with thickness values, and it is not sufficient to report only UL grades without thickness.
Flammablity test principle analysis
The test principle :
(1) combustion intensity and speed test:Under prescribed conditions, put in the sample oblique Angle of 45 °, 1 s in specimen ignition, the sample with flame burning up the time needed for a certain distance, a measure of the combustion intensity as the evaluation of the textiles. A fabric with a surface fleece, the ignition or melting of the base cloth as an additional indicator of the intensity of combustion.
(2) damage area and damage length test:Under specified test conditions, the 45 ° direction textile sample ignition, measuring fabric continue burning and after burning smoldering time length, damage area and damage.
(3) contact flame frequency test:Under specified test conditions, the 45 ° direction textile sample ignition, measuring fabric flame is 90 mm from the sample bottom place need to contact the number of times.
2018-06-22 13:24
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