ASTM D1042-12(2017)

Standard Test Method for Linear Dimensional Changes of Plastics Caused by Exposure to Heat and Moisture

SIGNIFICANCE AND USE
4.1 This test method is intended only as a convenient test method for measurement of linear dimensional changes in plastics subjected to defined conditions of test as outlined in Sections 7 and 8.
SCOPE
1.1 This test method is designed to provide a means for measuring in plastic specimens the dimensional changes such as shrinkage or expansion, developed under specific heat and water conditionings.  
1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard.  
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.
Note 1: There is no known ISO equivalent to this standard.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Historical
• Publication Date: 31-Jul-2017
• ICS: 83.080.01 - Plastics in general
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.50 - Durability of Plastics

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D1042 − 12 (Reapproved 2017)
Standard Test Method for
Linear Dimensional Changes of Plastics Caused by
Exposure to Heat and Moisture
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 4. Significance and Use
1.1 This test method is designed to provide a means for 4.1 This test method is intended only as a convenient test
measuring in plastic specimens the dimensional changes such method for measurement of linear dimensional changes in
as shrinkage or expansion, developed under specific heat and plastics subjected to defined conditions of test as outlined in
water conditionings. Sections 7 and 8.
1.2 The values stated in SI units are to be regarded as
5. Apparatus
standard. The values given in parentheses are mathematical
5.1 Scriber, so constructed that two sharp needle points are
conversions to inch-pound units that are provided for informa-
rigidly separated by 100 6 0.2 mm. The scriber, as shown in
tion only and are not considered standard.
Fig. 1, consists of two sharp steel needles, approximately 1.5
1.3 This standard does not purport to address all of the
mm in diameter. The needles are to be inserted in drilled holes
safety concerns, if any, associated with its use. It is the
with their axes parallel to each other and perpendicular to and
responsibility of the user of this standard to establish appro-
intersecting the long axis of a stainless steel rigid rod or bar
priate safety and health practices and determine the applica-
stock, 125 6 5 mm in length. The needles’ points shall extend
bility of regulatory limitations prior to use.
6 6 2 mm beyond the supporting rod and are held in position
NOTE 1—There is no known ISO equivalent to this standard.
by setscrews inserted through the ends of the rod. The scriber
1.4 This international standard was developed in accor- shall be calibrated by scribing an arc onto an unconditioned
dance with internationally recognized principles on standard- sample and measuring this initial scribed distance with a
ization established in the Decision on Principles for the calibrated caliper to the nearest 0.1 mm.Thickness of arc lines
Development of International Standards, Guides and Recom- shall not exceed 0.02 mm.
NOTE 2—Phonograph needles may be used as a satisfactory scriber.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
5.2 Measuring Microscope, having a magnification of at
least 20× and graduated to have a resolution of 0.01 mm.
2. Referenced Documents
NOTE 3—For more precise measurements, a micrometer microscope
2.1 ASTM Standards:
should be used.
D883Terminology Relating to Plastics
5.3 Caliper, 6-in., with a readability of 0.01 mm and an
D5947Test Methods for Physical Dimensions of Solid
illuminated desk magnifier, 1.75× to 2.0× to assist with the
Plastics Specimens
placement of the caliper points onto the scribed lines
5.4 Beaker, having a suitable size for the number of speci-
3. Terminology
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-
tained at 23 6 2°C and 50 6 10 % RH.
5.6 Conditioning Oven, full draft air-circulating oven, ca-
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
pable of being maintained within 62°C of the set temperature.
and is the direct responsibility of Subcommittee D20.50 on Durability of Plastics.
Current edition approved Aug. 1, 2017. Published August 2017. Originally
5.7 Absorbent Material, cloth or paper suitable for drying.
publishedasD1042–49T.LastpreviouseditionD1042–12.DOI:10.1520/D1042-
12R17.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 6. Test Specimens
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
6.1 Specimensshallnotbelessthan110mminlengthinthe
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. direction of test. The preferred specimen size is 125 65mm
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D1042 − 12 (2017)
FIG. 1 Scriber
1—Original arc
in length by 13 6 0.5 mm wide by 3.0 (-0.0 + 0.2) mm thick.
2—After 37.7°C (100°F) and 100 % humidity
Refer to Test Method D5947 for guidance on measuring
3—After 60°C (140°F)
physical dimensions of solid plastic specimens.
4—Final conditioning
FIG. 2 Scribing Test Specimens for Measurement
6.2 Three specimens shall be tested for each conditioning.
6.3 Individual specimens shall be positioned vertically in
8.2 After conditioning, reinsert one needle in the original
the specified environment.
centeranddrawashortarcwiththeother.Measurethedistance
NOTE 4—A wire hook inserted in a hole drilled in one end of the
(D ) between the original arc and the new arc with either a
B
specimen has been found acceptable.
caliper or the microscope. Measure the separation of the arcs
betweencorrespondingpositions,forexample,centertocenter.
7. Conditioning and Exposure
8.3 If the test specimen is not flat, flatten it by pressing or
7.1 Preconditioning
clamping it against a plane surface before scribing the arcs and
7.1.1 Unless otherwise specified in the appropriate material
making the measurements
...

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.
Designation: D1042 − 12 D1042 − 12 (Reapproved 2017)
Standard Test Method for
Linear Dimensional Changes of Plastics Caused by
Exposure to Heat and Moisture
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. 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*Scope
1.1 This test method is designed to provide a means for measuring in plastic specimens the dimensional changes such as
shrinkage or expansion, developed under specific heat and water conditionings.
1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions
to inch-pound units that are provided for information only and are not considered standard.
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.
NOTE 1—There is no known ISO equivalent to this standard.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
D883 Terminology Relating to Plastics
D5947 Test Methods for Physical Dimensions of Solid Plastics Specimens
3. Terminology
3.1 Definitions: Definitions of terms applying to this test method appear in Terminology D883.
4. Significance and Use
4.1 This test method is intended only as a convenient test method for measurement of linear dimensional changes in plastics
subjected to defined conditions of test as outlined in Sections 7 and 8.
5. Apparatus
5.1 Scriber, so constructed that two sharp needle points are rigidly separated by 100 6 0.2 mm. The scriber, as shown in Fig.
1, consists of two sharp steel needles, approximately 1.5 mm in diameter. The needles are to be inserted in drilled holes with their
axes parallel to each other and perpendicular to and intersecting the long axis of a stainless steel rigid rod or bar stock, 125 6 5
mm in length. The needles’ points shall extend 6 6 2 mm beyond the supporting rod and are held in position by setscrews inserted
through the ends of the rod. The scriber shall be calibrated by scribing an arc onto an unconditioned sample and measuring this
initial scribed distance with a calibrated caliper to the nearest 0.1 mm. Thickness of arc lines shall not exceed 0.02 mm.
NOTE 2—Phonograph needles may be used as a satisfactory scriber.
5.2 Measuring Microscope, having a magnification of at least 20× and graduated to have a resolution of 0.01 mm.
NOTE 3—For more precise measurements, a micrometer microscope should be used.
This test method is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.50 on Durability of Plastics.
Current edition approved Nov. 15, 2012Aug. 1, 2017. Published December 2012August 2017. Originally published as D1042 – 49T. Last previous edition
D1042 – 06.D1042 – 12. DOI: 10.1520/D1042-12.10.1520/D1042-12R17.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D1042 − 12 (2017)
FIG. 1 Scriber
5.3 Caliper, 6-in., with a readability of 0.01 mm and an illuminated desk magnifier, 1.75× to 2.0× to assist with the placement
of the caliper points onto the scribed lines
5.4 Beaker, having a suitable size for the number of specimens to be evaluated and is constructed of a material that is stable
under the test conditions.
5.5 Room or Conditioning Chamber, capable of being maintained at 23 6 2°C and 50 6 10 % RH.
5.6 Conditioning Oven, full draft air-circulating oven, capable of being maintained within 62°C of the set temperature.
5.7 Absorbent Material, cloth or paper suitable for drying.
6. Test Specimens
6.1 Specimens shall not be less than 110 mm in length in the direction of test. The preferred specimen size is 125 6 5 mm in
length by 13 6 0.5 mm wide by 3.0 (-0.0 + 0.2) mm thick. Refer to Test Method D5947 for guidance on measuring physical
dimensions of solid plastic specimens.
6.2 Three specimens shall be tested for each conditioning.
6.3 Individual specimens shall be positioned vertically in the specified environment.
NOTE 4—A wire hook inserted in a hole drilled in one end of the specimen has been found acceptable.
7. Conditioning and Exposure
7.1 Preconditioning
7.1.1 Unless otherwise specified in the appropriate material specification, precondition specimens at 23 6 2°C and 50 6 10 %
relative humidity for a minimum of 40 h prior to initial scribing.
NOTE 5—If moisture equilibrium is required prior to preconditioning, refer to the specific material specifications.
7.1.2 After removal from the pre-conditioning environment, specimens shall be tested within 30 min.
7.2 Method A—Water Immersion
7.2.1 Specimens shall be immersed in water maintained at 23 6 2°C for 168 6 1 h.
7.2.2 The specimens shall be wiped dry with the absorbent cloth after removal from the water and tested within 3 min.
7.3 Method B—Oven Conditioning
7.3.1 Specimens shall be conditioned in an oven at 70 6 2°C for 25 6 1 h.
7.3.2 After removal from the oven, the specimens shall be tested within 3
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