Standard Test Method for Measuring Liquid and Solid Material Fire Limits in Gaseous Oxidants

SCOPE
1.1 This test method covers a procedure for measuring the threshold-limit conditions to allow equilibrium of combustion of materials in various oxidant gases under specific test conditions of pressure, temperature, flow condition, fire-propagation directions, and various other geometrical features of common systems.
1.2 This test method is patterned after Test Method D2863-95 and incorporates its procedure for measuring the limit as a function of oxidant concentration for the most commonly used test conditions. Sections 8, 9, 10, 11, 13, and 14 for the basic oxidant limit (oxygen index) procedure are quoted directly from Test Method D2863-95. Oxygen index data reported in accordance with Test Method D2863-95 are acceptable substitutes for data collected with this standard under similar conditions.
1.3 This test method has been found applicable to testing and ranking various forms of materials. It has also found limited usefulness for surmising the prospect that materials will prove "oxygen compatible" in actual systems. However, its results do not necessarily apply to any condition that does not faithfully reproduce the conditions during test. The fire limit is a measurement of a behavioral property and not a physical property. Uses of these data are addressed in Guides G63 and G94.
Note 1--Although this test method has been found applicable for testing a range of materials in a range of oxidants with a range of diluents, the accuracy has not been determined for many of these combinations and conditions of specimen geometry, outside those of the basic procedure as applied to plastics.
Note 2--Test Method D2863-95 has been revised and the revised Test Method has been issued as D2863-97. The major changes involve sample dimensions, burning criteria and the method for determining the oxygen index. The aim of the revisions was to alignTest Method D2863 with ISO 4589-2. Six laboratories conducted comparison round robin testing on self-supporting plastics and cellular materials using D2863-95 and D2863-97. The results indicate that there is no difference between the means provided y the two methods at the 95 % confidence level. No comparison tests were conducted on thin films. The majority of ASTM Committee G4 favors maintaining the D2863-95 as the backbone of G125 until comprehensive comparison data become available.
1.4 One very specific set of test conditions for measuring the fire limits of metals in oxygen has been codified in Test Method G124. Test Method G124 measures the minimum pressure limit in oxygen for its own set of test conditions. Its details are not reproduced in this standard. A substantial database is available for this procedure, although it is much smaller than the database for Test Method D2863-95.
Note 3--Warning: During the course of combustion, gases, vapors, aerosols, fumes or any combination of these are evolved which may be hazardous.
Note 4--Precaution: Adequate precautions should be taken to protect the operator.
1.5 The values stated in SI units are to be regarded as the standard.
1.6 This basic standard should be used to measure and describe the properties of materials, products, or assemblies in response to heat and flame under controlled laboratory conditions and should not be used to directly describe or appraise the fire hazard or fire risk of materials, products or assemblies under actual fire conditions. However, results of this test may be used as elements of a fire risk assessment which takes into account all of the factors which are pertinent to an assessment of the fire hazard of a particular end use. The standard has more applicability in this regard at predicting the fire behavior of materials and components that are close in size to the test condition, than for systems that are much different (for example: comparing a test rod to a valve seat rather than comparing a test rod to a house or a particle)
1.7 This standard does not purport to address all of the saf...

General Information

Status
Historical
Publication Date
09-Nov-2000
Current Stage
Ref Project

Relations

Buy Standard

Standard
ASTM G125-95e1 - Standard Test Method for Measuring Liquid and Solid Material Fire Limits in Gaseous Oxidants
English language
9 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
e1
Designation: G 125 – 95
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
Measuring Liquid and Solid Material Fire Limits in Gaseous
1
Oxidants
This standard is issued under the fixed designation G 125; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of 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
e NOTE—Editorial corrections were made in April 1996.
1. Scope the fire limits of metals in oxygen has been codified in Test
Method G 124. Test Method G 124 measures the minimum
1.1 This test method covers a procedure for measuring the
pressure limit in oxygen for its own set of test conditions. Its
threshold-limit conditions to allow equilibrium of combustion
details are not reproduced in this standard. A substantial
of materials in various oxidant gases under specific test
database is available for this procedure, although it is much
conditions of pressure, temperature, flow condition, fire-
smaller than the database for Test Method D 2863.
propagation directions, and various other geometrical features
of common systems.
NOTE 2—Warning: During the course of combustion, gases, vapors,
1.2 This test method is patterned after Test Method D 2863
aerosols, fumes or any combination of these are evolved which may be
hazardous.
and incorporates its procedure for measuring the limit as a
NOTE 3—Precaution: Adequate precautions should be taken to protect
function of oxidant concentration for the most commonly used
the operator.
test conditions. Sections 8, 9, 10, 11, 13, and 14 for the basic
oxidant limit (oxygen index) procedure are quoted directly 1.5 The values stated in SI units are to be regarded as the
standard.
from Test Method D 2863. Oxygen index data reported in
accordance with Test Method D 2863 are acceptable substitutes 1.6 This basic standard should be used to measure and
describe the properties of materials, products, or assemblies in
for data collected with this standard under similar conditions. It
is anticipated that later revisions of Test Method D 2863 will response to heat and flame under controlled laboratory con-
ditions and should not be used to directly describe or appraise
yield similarly equivalent results, and as new revisions of Test
Method D 2863 are issued, any changes will be Test Method the fire hazard or fire risk of materials, products or assemblies
under actual fire conditions. However, results of this test may
reviewed for incorporation into this test method.
1.3 This test method has been found applicable to testing be used as elements of a fire risk assessment which takes into
account all of the factors which are pertinent to an assessment
and ranking various forms of materials. It has also found
limited usefulness for surmising the prospect that materials will of the fire hazard of a particular end use. The standard has
more applicability in this regard at predicting the fire behavior
prove “oxygen compatible” in actual systems. However, its
results do not necessarily apply to any condition that does not of materials and components that are close in size to the test
faithfully reproduce the conditions during test. The fire limit is condition, than for systems that are much different (for ex-
ample: comparing a test rod to a valve seat rather than
a measurement of a behavioral property and not a physical
property. Uses of these data are addressed in Guides G 63 and comparing a test rod to a house or a particle)
1.7 This standard does not purport to address all of the
G 94.
safety concerns, if any, associated with its use. It is the
NOTE 1—Although this test method has been found applicable for
responsibility of the user of this standard to establish appro-
testing a range of materials in a range of oxidants with a range of diluents,
priate safety and health practices and determine the applica-
the accuracy has not been determined for many of these combinations and
bility of regulatory limitations prior to use.
conditions of specimen geometry, outside those of the basic procedure as
applied to plastics.
2. Referenced Documents
1.4 One very specific set of test conditions for measuring
2.1 ASTM Standards:
D 618 Practice for Conditioning Plastics and Electrical
1 2
This test method is under the jurisdiction of ASTM Committee G-4 on
Insulating Materials for Testing
Compatibility and Sensitivity of Materials in Oxygen-Enriched Atmospheres and is
the direct responsibility of Subcommittee G 4.01 on Test Methods. Portions have
been adapted from Test Method D 2863 that is under the jurisdiction of ASTM
Comm
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.