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ASTM D2732-03

(Test Method)

Standard Test Method for Unrestrained Linear Thermal Shrinkage of Plastic Film and Sheeting

Standard Test Method for Unrestrained Linear Thermal Shrinkage of Plastic Film and Sheeting

SIGNIFICANCE AND USE
As a result of the manufacturing process, internal stresses may be locked into the film which can be released by heating. The temperature at which shrinkage will occur is related to the processing techniques employed to manufacture the film and may also be related to a phase transition in the base resin. The magnitude of the shrinkage will vary with the temperature of the film.
Shrinkage of a particular material produced by a particular process may be characterized by this test method by making measurements at several temperatures through the shrinkage range of the material.
Following a characterization in a particular case, it is usually sufficient thereafter to measure shrinkage at only one selected temperature for purposes of process or quality control, or both.
SCOPE
1.1 This test method covers determination of the degree of unrestrained linear thermal shrinkage at given specimen temperatures of plastic film and sheeting of 0.76 mm [0.030 in.] thickness or less. This test method does not cover shrinkage from loss of solvent in some materials.
1.2 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—This document is not equivalent to ISO 11501.

General Information

Status
Historical
Publication Date
09-Aug-2003
ICS
83.140.10 - Films and sheets
Technical Committee
D20 - Plastics
Drafting Committee
D20.19 - Film, Sheeting, and Molded Products
Current Stage
Ref Project

Relations

Replaces
ASTM D2732-96 - Standard Test Method for Unrestrained Linear Thermal Shrinkage of Plastic Film and Sheeting
Effective Date
10-Aug-2003
Replaced By
ASTM D2732-08 - Standard Test Method for Unrestrained Linear Thermal Shrinkage of Plastic Film and Sheeting
Effective Date
01-Nov-2008
Referred By
ASTM D8065/D8065M-16 - Standard Classification System and Basis for Specification for Specifying Plastic Films
Effective Date
10-Aug-2003
Referred By
ASTM D2673-14(2022) - Standard Specification for Oriented Polypropylene Film
Effective Date
10-Aug-2003
Referred By
ASTM D1204-14(2020) - Standard Test Method for Linear Dimensional Changes of Nonrigid Thermoplastic Sheeting or Film at Elevated Temperature
Effective Date
10-Aug-2003

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ASTM D2732-03 - Standard Test Method for Unrestrained Linear Thermal Shrinkage of Plastic Film and SheetingASTM D2732-03 - Standard Test Method for Unrestrained Linear Thermal Shrinkage of Plastic Film and Sheeting
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ASTM D2732-03 - Standard Test Method for Unrestrained Linear Thermal Shrinkage of Plastic Film and Sheeting
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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:D2732–03
Standard Test Method for
Unrestrained Linear Thermal Shrinkage of Plastic Film
1
and Sheeting
This standard is issued under the fixed designation D 2732; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope* gible restraint to inhibit shrinkage is present. It is normally
expressed as a percentage of the original dimension.
1.1 This test method covers determination of the degree of
unrestrained linear thermal shrinkage at given specimen tem-
4. Significance and Use
peratures of plastic film and sheeting of 0.76 mm [0.030 in.]
4.1 As a result of the manufacturing process, internal
thickness or less. This test method does not cover shrinkage
stresses may be locked into the film which can be released by
from loss of solvent in some materials.
heating. The temperature at which shrinkage will occur is
1.2 This standard does not purport to address all of the
related to the processing techniques employed to manufacture
safety concerns, if any, associated with its use. It is the
thefilmandmayalsoberelatedtoaphasetransitioninthebase
responsibility of the user of this standard to establish appro-
resin. The magnitude of the shrinkage will vary with the
priate safety and health practices and determine the applica-
temperature of the film.
bility of regulatory limitations prior to use.
4.2 Shrinkage of a particular material produced by a par-
NOTE 1—This document is not equivalent to ISO 11501.
ticular process may be characterized by this test method by
making measurements at several temperatures through the
2. Referenced Documents
shrinkage range of the material.
2
2.1 ASTM Standards:
4.3 Following a characterization in a particular case, it is
D 618 Practice for Conditioning Plastics for Testing
usually sufficient thereafter to measure shrinkage at only one
D 883 Terminology Relating to Plastics
selected temperature for purposes of process or quality control,
D 1204 Test Method for Linear Dimensional Changes of
or both.
Nonrigid Thermoplastic Sheeting or Film at Elevated
Temperature 5. Apparatus
E1 Specification for ASTM Thermometers
5.1 Constant-Temperature Liquid Bath, capable of control-
3
2.2 ISO Standard:
ling accurately to 60.5°C.
ISO 11501 Determination of Dimensional Change on Heat-
5.1.1 The liquid for the bath should not plasticize or react
ing
with the specimens. Poly(ethylene glycol), glycerin, and water
have been found to have wide applicability.
3. Terminology
5.2 Thermometer—ASTM Thermometer 1 C conforming to
3.1 Definitions:
the requirements as prescribed in SpecificationE1.
3.1.1 unrestrained linear thermal shrinkage (free shrink or
5.3 Square Metal Stamp, 100 by 100 mm, with engraved
shrinkage)—the irreversible and rapid reduction in linear
arrow indicating machine direction of film and stamp pad and
dimension in a specified direction occurring in film subjected
ink. (The ink should not be soluble in the bath liquid.)
to elevated temperatures under conditions where nil or negli-
NOTE 2—Ametal die or template (100 by 100 mm) can be used instead
of the square metal stamp.
1
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
5.4 Free Shrink Holder—A holder designed for test of a
and is the direct responsibility of Subcommittee D20.19 on Film and Sheeting.
single specimen, such as that shown in Fig. 1 and Fig. 2.
Current edition approved Aug. 10, 2003. Published October 2003. Originally
approved in 1968. Last previous edition approved in 1996 as D 2732 – 96.
Alternatively, a holder such as that shown in Fig. 3 may be
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
used to immerse several specimens at a time. However, checks
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
must be made to assure that contact among the specimens does
Standards volume information, refer to the standard’s Document Summary page on
not result in errors.
the ASTM website.
3
Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
4th Floor, New York, NY 10036.
*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 ----------------------
D2732–03
NOTE:
1 1
1. (A) Cut hardware cloth 6 ⁄8 by 6 ⁄8 .
(B) Form a pocket in center of cloth.
(C) Weld cloth to frame as shown.
2. Two required for assembly.
FIG. 1 Construction of Top and Bottom Grid Retainers of Specimen Holder
...

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SIGNIFICANCE AND USE
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SCOPE
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FIG. 1 Elements of an Instrumented Dart Drop System
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5.1 When a drop of liquid rests on the surface of a solid, and a gas is in contact with both, the forces acting at the interfaces must balance. These forces can be represented by surface energies acting in the direction of the surfaces and it follows that:
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SCOPE
1.1 This test method covers the measurement of the wetting tension of a polyethylene or polypropylene film surface in contact with drops of specific test solutions in the presence of air.  
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Standard Practice for Fabrication of Ring Test Specimens for Glass-Resin Composites

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4.1 This practice provides a uniform procedure for fabricating glass fiber/thermoset resin ring samples for use as test specimens. Specimens so prepared can be used in Test Methods D2290 and D2344/D2344M.
SCOPE
1.1 This practice is intended for use in the fabrication of ring-type test specimens to be used in the evaluation of the mechanical properties of reinforcement and resins in a composite structure. The practice outlines the steps in the preparation of the test specimens, including the final specimen machining where applicable. Three final ring configurations are included.  
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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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
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Standard Specification for Nonrigid Vinyl Chloride Plastic Film and Sheeting

ABSTRACT
This specification covers nonrigid, unsupported vinyl chloride plastic film and sheeting in which the resin portion of the composition contains at least 90 % vinyl chloride. The remaining 10 % may include one or more monomers copolymerized with vinyl chloride, or consist of other resins mechanically blended together with poly(vinyl chloride) or copolymers thereof. The film and sheeting covered herein shall be 0.075 to 0.25 mm (3 to 10 mils) in thickness for film and greater than 0.25 mm in thickness for sheet, and shall include the stabilizers and plasticizers necessary to meet the requirements of this specification. The material may be transparent, translucent, or opaque, and may be plain, printed, embossed, or otherwise surface treated. This specification designates three general-purpose types of vinyl chloride film and sheeting - calendered, extruded, and cast. The materials shall be tested for its tensile strength and elongation at rapture, tear resistance, volatile loss, water extraction, low temperature impact, burning rate, shrinkage, and color fastness to rubbing.
SCOPE
1.1 This specification covers nonrigid, unsupported vinyl chloride plastic film and sheeting in which the resin portion of the composition contains at least 90 % vinyl chloride. The remaining 10 % can include one or more monomers copolymerized with vinyl chloride, or consist of other resins mechanically blended together with poly(vinyl chloride) or copolymers thereof.  
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    4 pages
    English language
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