Astm D 3874 – 03 pdf free download

Standard Test Method for
Ignition of Materials by Hot Wire Sources1

This standard is issued under the fixed designation D 3874; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

1. Scope

1.1 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

1.2 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.).

1.3 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:

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

1.3.2 Visible indentation of the wrapped wire into the

1.4 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 IEEE/ASTM SI-10 for further details.)

1.5 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.

1.6 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.

1.7 Fire testing of products and materials is inherently
hazardous, and adequate safeguards for personnel and property.

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