ASTM D6112-18

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: D6112 − 13 D6112 − 18
Standard Test Methods for
Compressive and Flexural Creep and Creep-Rupture of
1
Plastic Lumber and Shapes
This standard is issued under the fixed designation D6112; 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*
1.1 These test methods cover the determination of the creep and creep-rupture properties of plastic lumber and shapes, when
loaded in compression or flexure under specified environmental conditions. Test specimens in the “as-manufactured” form are
employed. As such, these are test methods for evaluating the properties of plastic lumber or shapes as a product and not material
property test methods.
1.2 Plastic lumber and plastic shapes are currently made predominantly with recycled plastics. However, this test method would
also be applicable to similar manufactured plastic products made from virgin resins where the product is non-homogenous in the
cross-section.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are for information
only.
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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
NOTE 1—There is no known ISO equivalent to this standard.
1.5 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
2.1 ASTM Standards:
D543 Practices for Evaluating the Resistance of Plastics to Chemical Reagents
D883 Terminology Relating to Plastics
D2990 Test Methods for Tensile, Compressive, and Flexural Creep and Creep-Rupture of Plastics
D4000 Classification System for Specifying Plastic Materials
3
D5033 Guide for Development of ASTM Standards Relating to Recycling and Use of Recycled Plastics (Withdrawn 2007)
D5947 Test Methods for Physical Dimensions of Solid Plastics Specimens
E4 Practices for Force Verification of Testing Machines
3. Terminology
3.1 Definitions:
3.1.1 compression—in a compressive creep test, the decrease in length produced in the gauge length or the total length of a test
specimen.
3.1.2 creep modulus—the ratio of initial applied stress to creep strain.
3.1.3 creep strain—the total strain, at any given time, produced by the applied stress during a creep test.
1
These test methods are under the jurisdiction of ASTM Committee D20 on Plastics and are the direct responsibility of Subcommittee D20.20 on Plastic Lumber (Section
D20.20.01).
Current edition approved June 1, 2013June 1, 2018. Published June 2013June 2018. Originally approved in 1997. Last previous edition approved in 20102013 as
D6112 - 10.D6112 - 13. DOI: 10.1520/D6112-13.10.1520/D6112-18.
2
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 Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
The last approved version of this historical standard is referenced on www.astm.org.
*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
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---------------------- Page: 1 ----------------------
D6112 − 18
3.1.3.1 Discussion—The term creep, as used in this test method, reflects current plastics engineering usage. In scientific practice,
creep is often defined to be the nonelastic portion of strain. However, this definition is not applicable to existing engineering
formulas. Plastics have a wide spectrum of retardation times, and elastic portions of strain cannot be separated in practice from
nonelastic. Therefore, wherever “strain” is mentioned in these test methods, it refers to the sum of elastic strain plus the additional
strain with time.
3.1.4 deflection—in a flexural creep test, the change in mid-span position of a test specimen.
3.1.5 deformation—a ch
...

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: D6112 − 18
Standard Test Methods for
Compressive and Flexural Creep and Creep-Rupture of
1
Plastic Lumber and Shapes
This standard is issued under the fixed designation D6112; 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* D543 Practices for Evaluating the Resistance of Plastics to
Chemical Reagents
1.1 These test methods cover the determination of the creep
D883 Terminology Relating to Plastics
and creep-rupture properties of plastic lumber and shapes,
D2990 Test Methods for Tensile, Compressive, and Flexural
when loaded in compression or flexure under specified envi-
Creep and Creep-Rupture of Plastics
ronmental conditions. Test specimens in the “as-manufactured”
D4000 Classification System for Specifying Plastic Materi-
form are employed. As such, these are test methods for
als
evaluating the properties of plastic lumber or shapes as a
D5033 Guide for Development of ASTM Standards Relating
product and not material property test methods.
to Recycling and Use of Recycled Plastics (Withdrawn
1.2 Plastic lumber and plastic shapes are currently made 3
2007)
predominantly with recycled plastics. However, this test
D5947 Test Methods for Physical Dimensions of Solid
method would also be applicable to similar manufactured
Plastics Specimens
plastic products made from virgin resins where the product is
E4 Practices for Force Verification of Testing Machines
non-homogenous in the cross-section.
1.3 The values stated in inch-pound units are to be regarded 3. Terminology
as standard. The values given in parentheses are for informa-
3.1 Definitions:
tion only.
3.1.1 compression—in a compressive creep test, the de-
1.4 This standard does not purport to address all of the
crease in length produced in the gauge length or the total length
safety concerns, if any, associated with its use. It is the
of a test specimen.
responsibility of the user of this standard to establish appro-
3.1.2 creep modulus—the ratio of initial applied stress to
priate safety, health, and environmental practices and deter-
creep strain.
mine the applicability of regulatory limitations prior to use.
3.1.3 creep strain—the total strain, at any given time,
NOTE 1—There is no known ISO equivalent to this standard.
produced by the applied stress during a creep test.
1.5 This international standard was developed in accor-
3.1.3.1 Discussion—The term creep, as used in this test
dance with internationally recognized principles on standard-
method, reflects current plastics engineering usage. In scientific
ization established in the Decision on Principles for the
practice, creep is often defined to be the nonelastic portion of
Development of International Standards, Guides and Recom-
strain. However, this definition is not applicable to existing
mendations issued by the World Trade Organization Technical
engineering formulas. Plastics have a wide spectrum of retar-
Barriers to Trade (TBT) Committee.
dation times, and elastic portions of strain cannot be separated
in practice from nonelastic. Therefore, wherever “strain” is
2. Referenced Documents
mentioned in these test methods, it refers to the sum of elastic
2
2.1 ASTM Standards:
strain plus the additional strain with time.
3.1.4 deflection—in a flexural creep test, the change in
mid-span position of a test specimen.
1
These test methods are under the jurisdiction of ASTM Committee D20 on
Plastics and are the direct responsibility of Subcommittee D20.20 on Plastic Lumber
3.1.5 deformation—a change in shape, size or position of a
(Section D20.20.01).
test specimen as a result of compression, deflection, or exten-
Current edition approved June 1, 2018. Published June 2018. Originally
sion:
approved in 1997. Last previous edition approved in 2013 as D6112 - 13. DOI:
10.1520/D6112-18.
2
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
3
Standards volume information, refer to the standard’s Document Summary page on The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
*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
1

---------------------- Page: 1 ----------------------
D6112 − 18
3.1.6 plastic lumber, n—a manufactured product made pri- 6. Apparatus
marily from plastic materials (filled or unfilled), typically used
6.1 General:
as a building material for purposes similar to those of tradi-
6.1.
...