ASTM International

Standard Test Method for Ignition of Materials by Hot Wire Sources
 N D3874

Annotation

This test method is intended to differentiate, in a preliminary fashion, among materials with respect to their resistance to ignition because of their proximity to electricallyheated wires and other heat sources.2

This test method applies to molded or sheet materials available in thicknesses ranging from 0.25 to 6.4 mm (0.010 to 0.25 in.).

This test method applies to materials that are rigid at normal room temperatures. That is, it applies to materials for which the specimen does not deform during preparation, especially during the wire-wrapping step described in 10.1. Examples of deformation that render this test method inapplicable include:

Bowing, in either a transverse or a longitudinal direction, or twisting of the specimen, during the wirewrapping step, to a degree visible to the eye.

Visible indentation of the wrapped wire into the specimen.

The values stated in SI units are to be regarded as the standard. The inch-pound units given in parentheses are for information only. (See SI10 for further details.)

This test method measures and describes the response or materials, products, or assemblies to heat and flame under controlled conditions, but does not by itself incorporate all factors required for fire hazard or fire risk assessment of the materials, products, or assemblies under actual fire conditions.

This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.