ASTM D3201-94(1998)e1
(Test Method)Standard Test Method for Hygroscopic Properties of Fire-Retardant Wood and Wood-Base Products
Standard Test Method for Hygroscopic Properties of Fire-Retardant Wood and Wood-Base Products
SCOPE
1.1 This test method prescribes the procedure for determining the moisture content of fire-retardant-treated wood and wood base product samples after exposure to a standard high relative humidity condition of 90 + 3% at 27 + 2°C (80 + 4°F).
1.2 This standard does not purport to address all of the safety problems, 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.
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e1
Designation: D 3201 – 94 (Reapproved 1998)
Standard Test Method for
Hygroscopic Properties of Fire-Retardant Wood and Wood-
Based Products
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.
e NOTE—Section 9, Keywords, was added editorially in October 1998.
1. Scope 3. Apparatus
1.1 This test method prescribes the procedure for determin- 3.1 Conditioning Room or chamber with air circulation and
ing the moisture content of fire-retardant-treated wood and controlling instruments capable of being maintained at 27 6
wood–based product samples after exposure to a standard high 2°C (80 6 4°F) and a relative humidity of 90 6 3%.
relative humidity condition of 906 3 % at 27 6 2°C (80 6
NOTE 1—Other suitable means of maintaining these conditions are also
4°F).
acceptable; for example, the use of saturated disodium phosphate
1.2 The text of this test method references notes and
(Na HPO ) or a barium chloride (BaCl ) solution in a closed container
4 2
footnotes which provide explanatory material. These notes and with suitable solution agitation and air circulation at 27 6 2°C (80 6 4°F)
has been found satisfactory. It is desirable to install an air pump in the air
footnotes (excluding those in tables and figures) shall not be
space of the container and bubble air from this space through the saturated
considered as requirements of this test method.
solution.
1.3 This standard does not purport to address all of the
3.2 Oven, air-circulated and vented, capable of maintaining
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- a temperature of 103 6 2°C (2176 4°F).
3.3 Weighing Scale—A scale or balance that will weigh a
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. specimen within an accuracy of 60.2 %.
NOTE 2—A torsion balance, Harvard trip balance, triple-beam balance,
2. Significance and Use
and automatic direct-reading balances are examples of suitable equipment.
2.1 The hygroscopic properties of wood and wood-based
4. Test Specimens
products treated with fire-retardant chemicals are often greater
than for untreated products. This is particularly true at the
4.1 Specimens vary widely depending on the type of mate-
higher relative humidity conditions. This higher hygroscopicity
rial being analyzed. Specimens shall be selected that represent
may cause staining, decay, poor paint adhesion, and migration
the lot. Unless otherwise specified, specimens shall be full
and exuding of chemicals and moisture at the high humidities.
cross sections, no less than 25.4 mm (1 in.) along the grain, but
Corrosion of metal fasteners may also occur.
longer as needed to provide a minimum volume of 33 cm (2
2.2 The results obtained with this standard are important in
in. ).
determining the treatments with the lesser hygroscopic prop-
4.2 The specimens shall be penetrated by the chemical to be
erties.
representative for the treated product.
2.3 The results will be useful in determining exposure
4.3 The specimens shall be in moisture equilibrium with a
limitations in service for specific treated products.
laboratory ambient condition of 30 to 65 % relative humidity
2.4 Also, current leach-resistant, exterior-type, fire-
or shall be exposed for at least 7 days at such a condition prior
retardant-treated wood and wood–based products have hygro-
to high-humidity exposure.
scopic properties at this exposure nearly equal to untreated
NOTE 3—If it is likely that the specimen will support fungal or mold
products. Therefore, the results from this standard may be
growth during the high humidity exposure, then the specimens should be
useful in determining if exterior or interior type treatments
sprayed with a suitable biocide just prior to the above exposure and
have been used.
allowed to air-dry for the seven days.
4.4 Untreated specimens, when available, of the same spe-
This test method is under the jurisdiction of ASTM Committee D-7 on Wood
cies or wood-based product and of the same size, shall be
and is the direct responsibility of Subcommittee D07.07 on Fire Performance of
exposed to the preconditioning, high-humidity exposure, and
Wood.
Current edition approved April 15, 1994. Published June 1994. Originally
drying along with the treated specimens.
published as D 3201 – 73T. Last previous edition D 3201 – 86.
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
D 3201
NOTE 4—The use of untreated control specimens is h
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