Flammability ASTM D635

Flammability ASTM D635, ISO 3795

The flammability test is an important tool used in quality control, production control and material comparisons. The test is designed to determine the relative rate of burning of self-supporting plastics, and is not intended as a criterion for fire hazard.

To conduct the test, a sample is oriented either horizontally or vertically and placed in the test chamber. A Bunsen Burner is then applied to the sample for a specified amount of time, and the time or distance that the flame propagates is measured. The test may also measure whether the flame burns through the sample or drops from the sample to ignite cotton below.

There are different specimen sizes required for the test, depending on the standard being used. ASTM D635 requires a specimen size of 125 mm long x 13 mm wide x the thickness to be rated, while ISO 3795 requires a specimen size of 100 x 356 mm (4" x 14") x no more than 13mm (0.5").

The data collected during the test includes the time until the flame extinguishes itself, the distance the burn propagates, and the linear burning rate in mm per minute. This information can be used for quality control, production control and material comparisons, and can help to inform decisions about the use of different materials in different applications.

It is important to note that this test description is intentionally generic in nature, and is intended to provide a broad overview of the flammability test. More detailed information about specific test procedures and specimen sizes can be found in the relevant standards, such as ASTM D635 and ISO 3795.