ASTM D635, ISO 3795 Flammability

ASTM D635, ISO 3795 Flammability

ASTM D635, ISO 3795 flammability test determines the ignition or combustion properties of substantial thick-walled plastics by calculating their rate of burning. The results obtained are used for quality checks, production benchmarks, and material comparisons during production.


    Flammability ASTM D635 standards assess the ignition or combustion properties of certain materials such as plastics. ASTM D635 flammability test determines the rate of burning of substantial thick-walled plastics. This test is mainly used for quality checks, production benchmarks, and material comparisons. It is not used as a criterion for fire-related risks. This test assesses the ignition or combustion properties of certain materials such as those used in the production of plastic items.

    Test Procedure:

    In the ASTM D635 procedure for the Flammability test, a sample is oriented either vertically or horizontally and placed in the test chamber. Then, the flame is applied using a Bunsen Burner for a measured time. Finally, as the flame propagates, the time or distance at which the flame is put off is measured.

    Specimen size:

    ASTM D635 sample sizes are 125 mm × 13 mm × required thickness ‘t’ to be rated

    ISO 3795 sample sizes are 100 mm × 356 mm (4 inches × 14 inches) x 13mm (0.5 inch)


    Time duration before the fire extinguishes

    The distance through the burn propagation

    The linear burning rate (mm per minute)

    Mass of cotton ignited in case fire drops


    ASTM D635 is a standard test method for rate of burning or extent and time of burning of plastics in a horizontal position.


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