Flammability ASTM D635, ISO 3795

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 the 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 ASTM D635 are 125 mm long x 13 mm wide x the thickness to be rated.
Specimen sizes for 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.
If the flame burns through the test sample or drops from the test sample to ignite cotton below.

**Please note that this test description is intentionally generic in nature and aimed at providing a descriptive summary to enhance test understanding. The standards can be obtained from appropriate standards authorities.