ASTM D1042-06

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D1042 − 06
StandardTest Method for
Linear Dimensional Changes of Plastics Under Accelerated
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Service Conditions
This standard is issued under the fixed designation D1042; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* intersecting the long axis of a stainless steel rigid rod or bar
stock, 125 6 5 mm in length. The needles’ points shall extend
1.1 This test method is designed to provide a means for
6 6 2 mm beyond the supporting rod and are held in position
measuring in plastic specimens the dimensional changes re-
by setscrews inserted through the ends of the rod. The scriber
sulting from exposure to service conditions. In particular, this
shall be calibrated by scribing an arc onto an unconditioned
test method is suitable for measuring shrinkage or elongation
sample and measuring this initial scribed distance with a
developed under specific oven and water conditionings.
calibrated caliper to the nearest 0.1 mm.Thickness of arc lines
1.2 This standard does not purport to address all of the
shall not exceed 0.02 mm.
safety concerns, if any, associated with its use. It is the
NOTE 2—Phonograph needles may be used as a satisfactory scriber.
responsibility of the user of this standard to establish appro-
5.2 Measuring Microscope, having a magnification of at
priate safety and health practices and determine the applica-
least 20× and graduated to have a resolution of 0.01 mm.
bility of regulatory limitations prior to use.
NOTE 1—There is no known ISO equivalent to this standard.
NOTE 3—For more precise measurements, a micrometer microscope
should be used.
2. Referenced Documents
5.3 Caliper, 6-in., with a readability of 0.01 mm and an
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2.1 ASTM Standards:
illuminated desk magnifier, 1.75× to 2.0× to assist with the
D883Terminology Relating to Plastics
placement of the caliper points onto the scribed lines
3. Terminology
5.4 Beaker, having a suitable size for the number of speci-
mens to be evaluated and is constructed of a material that is
3.1 Definitions: Definitions of terms applying to this test
stable under the test conditions.
method appear in Terminology D883.
5.5 Room or Conditioning Chamber,capableofbeingmain-
4. Significance and Use
tained at 23 6 2°C and 50 6 5% RH.
4.1 This test method is intended only as a convenient test
5.6 Conditioning Oven, full draft air-circulating oven, ca-
method for measurement of linear dimensional changes in
pable of being maintained within 62°C of the set temperature.
plastics subjected to defined conditions of test as outlined in
Sections 7 and 8.
5.7 Absorbent Material, cloth or paper suitable for drying.
5. Apparatus
6. Test Specimens
5.1 Scriber, so constructed that two sharp needle points are
6.1 Specimensshallnotbelessthan110mminlengthinthe
rigidly separated by 100 6 0.2 mm. The scriber, as shown in
direction of test. The preferred specimen size is 125 65mm
Fig. 1, consists of two sharp steel needles, approximately 1.5
in length by 13 6 0.5 mm wide by 3.0 (-0.0 + 0.2) mm thick.
mm in diameter. The needles are to be inserted in drilled holes
with their axes parallel to each other and perpendicular to and
6.2 Three specimens shall be tested for each conditioning.
6.3 Individual specimens shall be positioned vertically in
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This test method is under the jurisdiction ofASTM Committee D20 on Plastics
the specified environment.
and is the direct responsibility of Subcommittee D20.50 on Durability of Plastics.
Current edition approved Sept. 1, 2006. Published September 2006. Originally
NOTE 4—A wire hook inserted in a hole drilled in one end of the
published as D1042–49T. Last previous edition D1042–01a. DOI: 10.1520/
specimen has been found acceptable.
D1042-06.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
7. Conditioning and Exposure
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 7.1 Preconditioning
*A Summary of Changes section appears at the end of this standard
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D1042 − 06
8.2 After conditioning, reinsert one needle in the original
centeranddrawashortarcwiththeother.Measurethedistance
between the original arc and the new arc with either a caliper
or the microscope. Measure the separation of the arcs between
corresponding positions, for example, center to center.
8.3 If the test specimen is not flat, flatten it by pressing o
...