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ASTM D756-93

(Practice)

Practice for Determination of Weight and Shape Changes of Plastics Under Accelerated Service Conditions (Withdrawn 1998)

Practice for Determination of Weight and Shape Changes of Plastics Under Accelerated Service Conditions (Withdrawn 1998)

General Information

Status
Withdrawn
Withdrawal Date
09-Mar-1998
ICS
83.080.01 - Plastics in general
Technical Committee
D20 - Plastics
Drafting Committee
D20.50 - Durability of Plastics
Current Stage
Ref Project

Relations

Referred By
ASTM D618-21 - Standard Practice for Conditioning Plastics for Testing
Effective Date
30-Sep-2023

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ASTM D756-93 - Practice for Determination of Weight and Shape Changes of Plastics Under Accelerated Service Conditions (Withdrawn 1998)ASTM D756-93 - Practice for Determination of Weight and Shape Changes of Plastics Under Accelerated Service Conditions (Withdrawn 1998)
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ASTM D756-93 - Practice for Determination of Weight and Shape Changes of Plastics Under Accelerated Service Conditions (Withdrawn 1998)
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D756–93
Standard Practice for
Determination of Weight and Shape Changes of Plastics
1
Under Accelerated Service Conditions
This standard is issued under the fixed designation D756; 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 (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 to replace Method 6011 of Federal Test Method
Standard 406. Consult the DoD Index of Specifications and Standards for the specific year of issue which has been adopted by the
Department of Defense.
1. Scope 2. Referenced Documents
1.1 Thispracticecoversthedeterminationoftheweightand 2.1 ASTM Standards:
shapechangesoccurringinplasticsundervariousconditionsof D618 Practice for Conditioning Plastics and Electrical
2
use, not where exposure to direct sunlight, weathering, corro- Insulating Materials for Testing
2
siveatmospheres,orheataloneisinvolved,butwherechanges D883 Terminology Relating to Plastics
inatmospherictemperatureandhumidityareencountered.This
3. Terminology
embraces the interior of buildings, and the interior of transport
facilitiessuchasmotorvehicles,airplanecargospacesorwing 3.1 Definitions—Definitions of terms applying to this prac-
tice appear in Terminology D883.
interiors, holds of ships, and railroad cars. Procedures are
provided for exposing plastics to combinations of extreme
4. Significance and Use
humidity and temperature that will accelerate the changes
4.1 The test conditions covered in this practice represent a
taking place in the materials kept in sheltered spaces but
start towards organizing a group of test procedures for deter-
subjecttohumidityandtemperaturevariation(seeExplanatory
mining the effects of specified changes of atmospheric tem-
Note).
perature and humidity upon plastic articles. These procedures
1.2 Seven test procedures are provided which prescribe
have been used for testing both thermosetting and thermoplas-
conditions for different types of exposure. Six of the proce-
tic materials.
dures cover exposures at graduated levels of temperature and
extremes of humidity; the seventh prescribes conditions in-
NOTE 2—The test procedures covered in this practice have been drawn
volving alternate exposure to high and low temperatures.
from various tests used in branches of the plastics industry, and by
Insofar as weight and shape changes, embraced under the
government agencies in procurement of materials.
general term of dimensional stability, are concerned, these
4.2 Whileseveralofthetestingtemperaturesarenotusedin
procedures provide a method of test. Further use of any of the
other ASTM standards, they have a background of several
conditions set up in the procedures is suggested, such as
yearsexperienceinportionsoftheplasticsindustry.Especially
conditioning schedules prior to physical testing of the plastic
in Procedures D and E (Sections 13 and 14) the accelerating
either to test it at the particular condition involved, or to study
effect of temperature in prompting changes caused by a rise in
changes resulting from exposure to that condition.
humidity leads to temperatures that are well above those
1.3 The values stated in SI units are to be regarded as the
encountered in normal service, and they are used simply to
standard. The values given in parentheses are for information
accelerate change.
only.
4.3 Procedure A (Section 10) has been found to develop
1.4 This standard does not purport to address all of the
warping, weight change, and exudation in plastic parts. Proce-
safety problems, if any, associated with its use. It is the
dure B (Section 11) is designed to reveal poorly cured plastics
responsibility of the user of this standard to establish appro-
by developing cracks in them. Procedures C and D are more
priate safety and health practices and determine the applica-
severe measures of the same tendencies developed in Proce-
bility of regulatory limitations prior to use.
dureA; the conditions of Procedure D will produce noticeable
NOTE 1—There is no similar or comparable ISO standard. chemical decomposition in many plastics. Procedure E (Sec-
tion 14) is especially valuable in testing the behavior of plastic
parts with metallic inserts and laminates, for cracking on
1
This practice is under the jurisdiction of ASTM Committee D-20 on Plastics
andisthedirectresponsibilityofSubcommitteeD20.50onPermanenceProperties.
Current edition approved Feb. 15, 1993. Published April 1993. Originally
e1 2
published as D756–44T. Last previous edition D756–78 (1983) . Annual Book of ASTM Standards, Vol 08.01.
Copyright © ASTM International, 100 Barr Harbor Drive,
...

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5.1 The property KIc  (GIc) determined by these test methods characterizes the resistance of a material to fracture in a neutral environment in the presence of a sharp crack under severe tensile constraint, such that the state of stress near the crack front approaches plane strain, and the crack-tip plastic (or non-linear viscoelastic) region is small compared with the crack size and specimen dimensions in the constraint direction. A KIc value is believed to represent a lower limiting value of fracture toughness. This value has been used to estimate the relation between failure stress and defect size for a material in service wherein the conditions of high constraint described above would be expected. Background information concerning the basis for development of these test methods in terms of linear elastic fracture mechanics can be found in Refs  (1-5).3  
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1.1 These test methods are designed to characterize the toughness of plastics in terms of the critical-stress-intensity factor, KIc, and the energy per unit area of crack surface or critical strain energy release rate, GIc, at fracture initiation.  
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1.6 The significance of these test methods and many conditions of testing are identical to those of Test Method E399, and, therefore, in most cases, appear here with many similarities to the metals standard. However, certain conditions and specifications not covered in Test Method E399, but important for plastics, are included.  
1.7 This protocol covers the determination of GIc as well, which is of particular importance for plastics.  
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Standard Terminology Relating to Plastics

SCOPE
1.1 This terminology covers definitions of technical terms used in the plastics industry. Terms that are generally understood or adequately defined in other readily available sources are not included.  
1.2 When a term is used in an ASTM document for which Committee D20 is responsible it is included only when judged, after review, by Subcommittee D20.92 to be a generally usable term.  
1.3 Definitions that are identical to those published by another standards body are identified with the abbreviation of the name of the organization; for example, IUPAC is the International Union of Pure and Applied Chemistry.  
1.4 A definition is a single sentence with additional information included in discussion notes. It is reviewed every 5 years; the year of last review is appended.  
1.5 For literature related to plastics terminology, see Appendix X1.  
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