Standard Test Method for
Hygroscopic Properties of Fire-Retardant Wood and WoodBased Products1
This standard is issued under the fixed designation D 3201; 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.
1.1 This test method prescribes the procedure for determining the moisture content of fire-retardant-treated wood and
wood–based product samples after exposure to a standard high
relative humidity condition of 906 3 % at 27 6 2°C (80 6
1.2 The text of this test method references notes and
footnotes which provide explanatory material.
These notes and footnotes (excluding those in tables and figures) shall not be
considered as requirements of this test method.
1.3 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.
2. Significance and Use
2.1 The hygroscopic properties of wood and wood-based
products treated with fire-retardant chemicals are often greater
than for untreated products.
This is particularly true at the
higher relative humidity conditions.
This higher hygroscopicity
may cause staining, decay, poor paint adhesion, and migration
and exuding of chemicals and moisture at the high humidities.
Corrosion of metal fasteners may also occur.
2.2 The results obtained with this standard are important in
determining the treatments with the lesser hygroscopic properties.
2.3 The results will be useful in determining exposure
limitations in service for specific treated products.
2.4 Also, current leach-resistant, exterior-type, fireretardant-treated wood and wood–based products have hygroscopic properties at this exposure nearly equal to untreated
Therefore, the results from this standard may be
useful in determining if exterior or interior type treatments
have been used.
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