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Flammability

UL94, ASTM D635,
49 CFR-571.302,
ISO 3795

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Scope:
The flammability test is used to determine the relative rate of burning of self-supporting plastics. This test is mainly used for quality control, production control and material comparisons. It cannot be used as a criterion for fire hazard.

Test Procedure:
The various flammability tests are all similar in that they (1) orient a test sample either horizontally or vertically and place it in a test chamber; (2) apply a flame from a Bunsen Burner for a specified time; and (3) measure the time or distance that the flame propagates.

Specimen size:
Specimen sizes for UL 94 and ASTM D635 are 125 mm long x 13 mm wide x the thickness to be rated.
Specimen sizes for 49CFR-571-302 and ISO 3795 are 100 x 356 mm (4" x 14") x no more than 13mm (0.5").

Data:
Time until the flame extinguishes itself.
Distance the burn propagates.
Linear burning rate in mm per minute.
Whether the flame burns through the test sample or whether flaming drops from the test sample ignite cotton below.

Equipment Used:
Hood
Flammability chamber
Bunsen Burner


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**Please note that this test description is intentionally generic in nature and aimed at providing a descriptive summary to enhance test understanding. For more information please contact a Intertek PTL Technical Representative at . Due to copyright restrictions, we are not able to provide copies of standards. Standards can be obtained from appropriate standards authorities.

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