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ASTM D 3874 Document Information:
Title
Standard Test Method for Ignition of Materials by Hot Wire Sources
ASTM International
Publication Date:
Sep 1, 2004
Scope:
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
electrically-heated wires and
other heat sources.(Footnote 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
wire-wrapping 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 IEEE/ASTM SI-10 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.
Fire testing of products and materials is inherently hazardous, and
adequate safeguards for
personnel and property shall be employed in conducting these tests.
Fire testing involves hazardous
materials, operations, and equipment.
NOTE 1 - Although this test method and IEC 60695-2-20, differ in
approach and in detail, data
obtained using either are technically equivalent.
Footnote 2 - K. N. Mathes, Chapter 4, "Surface Failure Measurements",
Engineering Dielectrics, Vol.
IIB, Electrical Properties of Solid Insulating Materials, Measurement
Techniques, R. Bartnikas,
Editor, ASTM STP 926, ASTM, Philadelphia, 1987.
Keywords:
- hot wire
- ignition
- resistance to ignition
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