Standard Practice for Performing Accelerated Outdoor Weathering of Factory- Coated Embossed Hardboard Using Concentrated Natural Sunlight and a Soak-Freeze-Thaw Procedure

SCOPE
1.1 This practice covers techniques to accelerate weathering effects of factory-coated embossed hardboard using apparatus described in Practice G90.  
1.2 This practice is based upon Procedure B, Cycle 1 of Practice G90 (concentrated natural sunlight with periodic surface water spray) plus a soak-freeze-thaw cycle (see 8.2 of this practice).  
1.3 Testing by use of the methods described in this practice may be employed in the qualitative assessment of weathering effects. The relative durability of coated hardboards may be best determined by comparison of their test results with those of pass-fail control specimens derived from real time exposure test experience (see Section 5 for specific guidelines).  
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
1.5 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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Historical
Publication Date
31-Dec-1994
Current Stage
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ASTM D5722-95 - Standard Practice for Performing Accelerated Outdoor Weathering of Factory- Coated Embossed Hardboard Using Concentrated Natural Sunlight and a Soak-Freeze-Thaw Procedure
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.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.
Designation: D 5722 – 95
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Practice for
Performing Accelerated Outdoor Weathering of Factory-
Coated Embossed Hardboard Using Concentrated Natural
Sunlight and a Soak-Freeze-Thaw Procedure
This standard is issued under the fixed designation D 5722; 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. Scope ering of Nonmetallic Materials Using Concentrated Natu-
ral Sunlight
1.1 This practice covers techniques to accelerate weathering
G 113 Terminology Relating to Natural and Artificial
effects of factory-coated embossed hardboard using apparatus
Weathering of Nonmetallic Materials
described in Practice G 90.
1.2 This practice is based upon Procedure B, Cycle 1 of
3. Terminology
Practice G 90 (concentrated natural sunlight with periodic
3.1 The terminology used in this practice is defined in
surface water spray) plus a soak-freeze-thaw cycle (see 5 of
Terminology G 113.
this practice).
3.2 Definitions:
1.3 Testing by use of the methods described in this practice
3.2.1 hardboard—generic term for a panel manufactured
may be employed in the qualitative assessment of weathering
primarily from inter-felted lignocellulosic fibers (usually
effects. The relative durability of coated hardboards may be
wood), consolidated under heat and pressure in a hot press to
best determined by comparison of their test results with those
3 3
a density of 0.50 g/cm (31 lb/ft )
of pass-fail control specimens derived from real time exposure
or greater and to which other materials may have been added
test experience (see 8.2 for specific guidelines).
during manufacture to improve certain properties.
1.4 The values stated in SI units are to be regarded as the
3.2.2 embossed hardboard—hardboard that is manufactured
standard. The values given in parentheses are for information
with a textured surface.
only.
3.2.2.1 Discussion—Wood-like and stucco patterns are ex-
1.5 This standard does not purport to address all of the
amples of typical embossed hardboard surfaces.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4. Summary of Practice
priate safety and health practices and determine the applica-
4.1 This practice is used to accelerate long-term weathering
bility of regulatory limitations prior to use.
effects by subjecting the samples to a concentrated natural
sunlight (with periodic daytime surface water spray) plus a
2. Referenced Documents
soak-freeze-thaw cycle.
2.1 ASTM Standards:
4.2 This practice has been useful in accelerating finish
D 660 Test Method for Evaluating Degree of Checking of
failure involving loss of film integrity, such as cracking,
Exterior Paints
peeling, and flaking of factory-coated embossed hardboard.
D 661 Test Method for Evaluating Degree of Cracking of
Exterior Paints
5. Significance and Use
D 662 Test Method for Evaluating Degree of Erosion of
2 5.1 The ability to quickly and accurately evaluate and
Exterior Paints
predict long-term weathering performance of factory-applied
D 772 Test Method for Evaluating Degree of Flaking (Scal-
2 coatings is of paramount importance in making sound business
ing) of Exterior Paints
and technical decisions.
D 4214 Test Methods for Evaluating Degree of Chalking of
2 5.2 It is important to include control specimens of known
Exterior Paint Films
field performance to determine the efficacy of this practice for
G 90 Practice for Performing Accelerated Outdoor Weath-
specific substrate(s) and coating system(s). These reference
specimens may include materials known to possess acceptable
and unacceptable field performance for the defect(s) under
consideration.
This practice is under the jurisdiction of ASTM Committee D-1 on Paint and
Related Coatings, Materials, and Applications and is the direct responsibility of
5.3 Results derived from this practice are best used to
Subcommittee D01.52 on Factory-Coated Wood Building Products.
Current edition approved May 15, 1995. Published July 1995.
Annual Book of ASTM Standards, Vol 06.01.
Annual Book of ASTM Standards, Vol 14.02.
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 5722
compare the relative performance of materials tested at the
same time in the same device.
5.4 The inclusion of control specimens and their resulting
data will assist in dealing with test variability caused by
seasonal or annual variations in important climatic factors.
However, quantitative service life approximations “accelera-
tion factors” based on the above data are not recommended
unless a sufficient number of field/accelerated test comparisons
have been analyzed to compute th
...

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