ASTM D3201-08a
(Test Method)Standard Test Method for Hygroscopic Properties of Fire-Retardant Wood and Wood-Based Products
Standard Test Method for Hygroscopic Properties of Fire-Retardant Wood and Wood-Based Products
SIGNIFICANCE AND USE
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 sometimes is the cause for staining, decay, poor paint adhesion, and migration and exuding of chemicals and moisture at the high humidities. Corrosion of metal fasteners sometimes also occurs.
The results obtained with this standard are important in identifying treatments with low hygroscopic properties.
Results can be useful in determining exposure limitations in service for specific treated products.
Building codes and other specifications for fire-retardant-treated wood for interior use include requirements based on this test method.
SCOPE
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 92 ± 2 % at 27 ± 2°C (81 ± 4°F).
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 The values stated in SI units are to be regarded as the standard. The inch-pound values given in parentheses are for information only and are not considered standard.
1.4 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.
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Designation:D3201–08a
Standard Test Method for
Hygroscopic Properties of Fire-Retardant Wood and Wood-
1
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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Significance and Use
1.1 This test method prescribes the procedure for determin- 4.1 The hygroscopic properties of wood and wood-based
ing the moisture content of fire-retardant-treated wood and products treated with fire-retardant chemicals are often greater
wood-based product samples after exposure to a standard high than for untreated products. This is particularly true at the
relative humidity condition of 92 6 2 % at 27 6 2°C higherrelativehumidityconditions.Thishigherhygroscopicity
(81 6 4°F). sometimesisthecauseforstaining,decay,poorpaintadhesion,
1.2 The text of this test method references notes and and migration and exuding of chemicals and moisture at the
footnotes which provide explanatory material. These notes and high humidities. Corrosion of metal fasteners sometimes also
footnotes (excluding those in tables and figures) shall not be occurs.
considered as requirements of this test method. 4.2 The results obtained with this standard are important in
1.3 The values stated in SI units are to be regarded as the identifying treatments with low hygroscopic properties.
standard. The inch-pound values given in parentheses are for 4.3 Results can be useful in determining exposure limita-
information only and are not considered standard. tions in service for specific treated products.
1.4 This standard does not purport to address all of the 4.4 Building codes and other specifications for fire-
safety concerns, if any, associated with its use. It is the retardant-treated wood for interior use include requirements
responsibility of the user of this standard to establish appro- based on this test method.
priate safety and health practices and determine the applica-
5. Apparatus
bility of regulatory limitations prior to use.
5.1 Conditioning chamber with air circulation and capable
2. Referenced Documents
of being maintained at 27 6 2°C (81 6 4°F) and a relative
2
2.1 ASTM Standards: humidity of 92 62%.
D9 Terminology Relating to Wood and Wood-Based Prod- 5.2 Oven, air-circulated and vented, capable of maintaining
ucts a temperature of 103 6 2°C (217 6 4°F).
E 176 Terminology of Fire Standards 5.3 Weighing Scale—A scale or balance that will weigh a
specimen within an accuracy of 60.2 %.
3. Terminology
6. Test Specimens
3.1 Definitions—Definitions used in this practice are in
accordance with TerminologiesD9 and E 176. 6.1 A minimum of five specimens shall be selected that
represent the lot. Unless otherwise specified, specimens shall
be full cross sections, no less than 25.4 mm (1 in.) along the
1
This test method is under the jurisdiction of ASTM Committee D07 on Wood
grain, but longer as needed to provide a minimum volume of
3 3
and is the direct responsibility of Subcommittee D07.07 on Fire Performance of
33 000 mm (2 in. ).
Wood.
6.2 The specimens shall be penetrated by the fire-retardant
Current edition approved Nov. 1, 2008. Published December 2008. Originally
approved in 1973. Last previous edition approved in 2008 as D 3201 – 08. chemical to be representative for the treated product.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
NOTE 1—The use of untreated specimens as control specimens is
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
recommended to provide verification of the high-humidity conditions
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. used.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D3201–08a
m – m
7. Procedure
f od
u,% 5 3 100 (2)
f
m od!
~
7.1 All measurements of the specimen weight shall be to an
accuracy of 60.2 %.
where:
7.2 The specimens shall be in moisture equilibrium with a
m = weight of the specimen after high-humidity expo-
f
laboratoryambientconditionof30to65%relativehumidityor
sure, and
shall be exposed for at least 7 days at such a condition prior to
m = ovendry weight of specimen after high-humidity
od
high-humidity exposure.
exposure.
7.3 If the specimens will support fungal or mold growth
NOTE 2—These methods of determining the moisture content do not
during the high humidity exposure, then the specimens shall be
correct for any volatilization of chemical during the ovendrying, which
sprayed with a suit
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
´1
Designation:D 3201–94 (Reapproved 1998) Designation:D3201–08a
Standard Test Method for
Hygroscopic Properties of Fire-Retardant Wood and Wood-
1
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 (´) indicates an editorial change since the last revision or reapproval.
1
´ NOTE—Section 9, Keywords, was added editorially in October 1998.
1. Scope
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% 92 6 2 % at 27 6 2°C
(80 6 4°F). (81 6 4°F).
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
1.3 The values stated in SI units are to be regarded as the standard. The inch-pound values given in parentheses are for
information only and are not considered standard.
1.4 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
2.1The 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.
2.2The results obtained with this standard are important in determining the treatments with the lesser hygroscopic properties.
2.3The results will be useful in determining exposure limitations in service for specific treated products.
2.4Also,currentleach-resistant,exterior-type,fire-retardant-treatedwoodandwood–basedproductshavehygroscopicproperties
at this exposure nearly equal to untreated products. Therefore, the results from this standard may be useful in determining if
exterior or interior type treatments have been used. Referenced Documents
2
2.1 ASTM Standards:
D9 Terminology Relating to Wood and Wood-Based Products
E176 Terminology of Fire Standards
3. Apparatus Terminology
3.1 Conditioning Roomorchamberwithaircirculationandcontrollinginstrumentscapableofbeingmaintainedat27 62°C(80
6 4°F) and a relative humidity of 90 6 3%.
NOTE1—Other suitable means of maintaining these conditions are also acceptable; for example, the use of saturated disodium phosphate (Na HPO )
2 4
or a barium chloride (BaCl ) solution in a closed container with suitable solution agitation and air circulation at 27 6 2°C (80 6 4°F) has been found
2
satisfactory. It is desirable to install an air pump in the air space of the container and bubble air from this space through the saturated solution.
3.2Definitions—Definitions used in this practice are in accordance with Terminologies D 9D9 and E 176E176.
4. Significance and Use
4.1 The hygroscopic properties of wood and wood-based products treated with fire-retardant chemicals are often greater than
1
This test method is under the jurisdiction ofASTM Committee D-7D07 on Wood and is the direct responsibility of Subcommittee D07.07 on Fire Performance of Wood.
Current edition approved April 15, 1994. Published June 1994. Originally published as D 3201–73T. Last previous edition D 3201–86.
Current edition approved Nov. 1, 2008. Published December 2008. Originally approved in 1973. Last previous edition approved in 2008 as D 3201 – 08.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
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D3201–08a
for untreated products. This is particularly true at the higher relative humidity conditions. This higher hygroscopicity sometimes
is the cause for staining
...
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