ASTM G126-94
(Terminology)Standard Terminology Relating to the Compatibility and Sensitivity of Materials in Oxygen Enriched Atmospheres
Standard Terminology Relating to the Compatibility and Sensitivity of Materials in Oxygen Enriched Atmospheres
SCOPE
1.1 This terminology defines terms related to the compatibility and sensitivity of materials in oxygen enriched atmosphere. It includes those standards under the jurisdiction of ASTM Committee G04.
1.2 The terminology concentrates on terms commonly encountered in and specific to practices and methods used to evaluate the compatibility and sensitivity of materials in oxygen. This evaluation is usually performed in a laboratory environment, and this terminology does not attempt to include laboratory terms.
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Designation: G 126 – 94
Standard Terminology Relating to the
Compatibility and Sensitivity of Materials in Oxygen
Enriched Atmospheres
This standard is issued under the fixed designation G 126; 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. Scope which may include time, pressure, contact with materials or
chemicals, temperature, abrasion, ionizing radiation, light,
1.1 This terminology defines terms related to the compat-
impact with gas or particles, tensile or compressive force
ibility and sensitivity of materials in oxygen enriched atmo-
(either static or cyclic), or any other feature that may be
sphere. It includes those standards under the jurisdiction of
present during a material’s service life. These stressors may
ASTM Committee G-4.
be present individually or in combination. G114
1.2 The terminology concentrates on terms commonly en-
artificial aging—aging in which a stress variable is outside the
countered in and specific to practices and methods used to
domain of exposure that the material might see in a
evaluate the compatibility and sensitivity of materials in
component for oxygen service or in which an alternative
oxygen. This evaluation is usually performed in a laboratory
mechanism is used to produce an effect that simulates the
environment, and this terminology does not attempt to include
results of natural aging. The degree of artificiality may vary
laboratory terms.
on a large scale. An example of mild artificiality might be
2. Referenced Documents
exposure of a material to a greater pressure than it experi-
ences in the use conditions. An example of extreme artifici-
2.1 ASTM Standards:
ality would be the use of sand paper to increase a material’s
G 63 Guide for Evaluating Nonmetallic Materials for Oxy-
surface roughness to simulate particle-impact abrasion that
gen Service
occurs in the use condition. A high degree of artificiality
G 72 Test Method for Autogenous Ignition Temperature of
affects the strength of conclusion that can be drawn, because
Liquids and Solids in a High-Pressure Oxygen-Enriched
it may be difficult to relate the results to the use condition.
Environment
Artificial aging that accelerates natural aging but does not
G 74 Test Method for Ignition Sensitivity of Materials to
alter it is preferred. G114
Gaseous Fluid Impact
autoignition temperature—the lowest temperature at which a
G 86 Test Method for Determining the Ignition Sensitivity
material will spontaneously ignite in oxygen under specific
of Materials to Mechanical Impact in Pressurized Oxygen
test conditions. G 63, G 95
Environments
blank, n—the contamination level of the fluid when the test
G 88 Guide for Designing Systems for Oxygen Service
coupon is omitted.
G 93 Practice for Cleaning Methods for Material and
Equipment Used in Oxygen-Enriched Environments
DISCUSSION—Sometimes referred to as “background” level. G 121
G 94 Guide for Evaluating Metals for Oxygen Service
cleaning effectiveness factor (CEF), n—the fraction of con-
G 120 Test Method for Evaluating the Effectiveness of
taminant removed from an initially contaminated test cou-
Cleaning Agents
pon and determined by gravimetric techniques. G 122
G 121 Practice for Preparation of Contaminated Test Cou-
contaminant—(1) a foreign or unwanted substance that can
pons for the Evaluation of Cleaning Agents
have deleterious effects on system operation, life or reliabil-
G 122 Test Method for Evaluating the Effectiveness of
ity. (2) unwanted molecular and particulate matter that could
Cleaning Agents
affect or degrade the performance of the components upon
3. Terminology
which they reside. G 93, G 120, G 121
contamination, n—a process of contaminating. G 120,
3.1 Definitions:
G 121
aging—the exposure of a material to stress, such stress of
control coupon (witness coupon), n—a coupon made from
the same material and prepared in exactly the same way as
This terminology is under the jurisdiction of ASTM Committee G-4 on the test coupons, which is used to verify the validity of the
Compatibility and Sensitivity of Materials in Oxygen Enriched Atmospheres and is
method or part thereof. G 120, G 121
the direct responsibility of Subcommittee G04.03 on Nomenclature and Definitions.
direct oxygen service—component surfaces in contact with
Current edition approved August 15, 1994. Published March 1995.
oxygen-enriched environments during normal operations.
Annual Book of ASTM Standards, Vol 14.02.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
G 126
Examples include oxygen compressor piston rings, control products. G93
valve seats, pipes, regulators, vessels and fittings. G 63, nonvolatile resid
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