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ASTM E 595 Document Information:
Title
Standard Test Method for Total Mass Loss and Collected Volatile Condensable Materials from Outgassing in a Vacuum Environment
ASTM International
Publication Date:
Dec 1, 2007
Scope:
This test method covers a screening technique to determine
volatile content of materials when exposed to a vacuum environment.
Two parameters are measured: total mass loss (TML) and collected
volatile condensable materials (CVCM). An additional parameter, the
amount of water vapor regained (WVR), can also be obtained after
completion of exposures and measurements required for TML and
CVCM.
This test method describes the test apparatus and related
operating procedures for evaluating the mass loss of materials
being subjected to 125°C at less than 7 X 10-3 Pa
(5 X 10-5 torr) for 24 h. The overall mass loss can
be classified into noncondensables and condensables. The latter are
characterized herein as being capable of condensing on a collector
at a temperature of 25°C.
NOTE 1—Unless otherwise noted, the tolerance on 25 and 125°C is
±1°C and on 23°C is ±2°C. The tolerance on relative humidity is ±5
%.
Many types of organic, polymeric, and inorganic materials can be
tested. These include polymer potting compounds, foams, elastomers,
films, tapes, insulations, shrink tubings, adhesives, coatings,
fabrics, tie cords, and lubricants. The materials may be tested in
the “as-received” condition or prepared for test by various curing
specifications.
This test method is primarily a screening technique for
materials and is not necessarily valid for computing actual
contamination on a system or component because of differences in
configuration, temperatures, and material processing.
The criteria used for the acceptance and rejection of materials
shall be determined by the user and based upon specific component
and system requirements. Historically, TML of 1.00 % and CVCM of
0.10 % have been used as screening levels for rejection of
spacecraft materials.
The use of materials that are deemed acceptable in accordance
with this test method does not ensure that the system or component
will remain uncontaminated. Therefore, subsequent functional,
developmental, and qualification tests should be used, as
necessary, to ensure that the material’s performance is
satisfactory.
This standard does not purport to address all of the safety
concerns 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.
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