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ASTM D 5229/D 5229M Document Information:
Title
Standard Test Method for Moisture Absorption Properties and Equilibrium Conditioning of Polymer Matrix Composite Materials
ASTM International
Publication Date:
Feb 15, 1992
Scope:
This test method covers a procedure (Procedure A) for the
determination of moisture absorption or
desorption properties in the through-the-thickness direction for
single-phase Fickian solid
materials in flat or curved panel form. Also covered are procedures
for conditioning test coupons
prior to use in other test methods; either to equilibrium in a
nonlaboratory environment (Procedure
B), to equilibrium in a standard laboratory atmosphere environment
(Procedure C), or to an
essentially moisture-free state (Procedure D). While intended
primarily for laminated polymer
matrix composite materials, these procedures are also applicable to
other materials that satisfy
the assumptions of 1.2.
The calculation of the through-the-thickness moisture diffusivity
constant in Procedure A assumes a
single-phase Fickian material with constant moisture absorption
properties through the thickness of
the specimen. The validity of the equations used in Procedure A for
evaluating the moisture
diffusivity constant in a material of previously unknown moisture
absorption behavior is uncertain
prior to the test, as the test results themselves determine if the
material follows the
single-phase Fickian diffusion model. A reinforced polymer matrix
composite material tested below
its glass-transition temperature typically meets this requirement,
although two-phase matrices such
as toughened epoxies may require a multi-phase moisture absorption
model. While the test procedures
themselves may be used for multi-phase materials, the calculations
used to determine the moisture
diffusivity constant in Procedure A are applicable only to
single-phase materials. Other examples
of materials and test conditions that may not meet the requirements
are discussed in Section 1.4.
The evaluation by Procedure A of the moisture equilibrium content
material property does not
assume, and is therefore not limited to, single-phase Fickian
diffusion behavior.
The procedures used by this test method may be performed, and the
resulting data reduced, by
suitable automatic equipment.
This test method is consistent with the recommendations of
MIL-HDBK-17B (1),(Footnote 2) which
describes the desirable attributes of a conditioning and moisture
property determination procedure.
The values stated in either SI units or inch-pound units are to be
regarded separately as standard.
Within the text the inch-pound units are shown in brackets. The values
stated in each system are
not exact equivalents; therefore, each system must be used
independently of the other. Combining
values from the two systems may result in nonconformance with the
standard.
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.
Footnote 2 - The boldface numbers in parentheses refer to the list of
references at the end of this
standard.
Keywords:
- conditioning
- moisture absorption
- moisture desorption
- moisture diffusivity
- moisture equilibrium
- polymer matrix composite materials
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