ASTM D618-05
(Practice)Standard Practice for Conditioning Plastics for Testing
Standard Practice for Conditioning Plastics for Testing
SIGNIFICANCE AND USE
Conditioning of specimens may be undertaken: (1) for the purpose of bringing the material into equilibrium with normal or average room conditions, (2) simply to obtain reproducible results, regardless of previous history of exposure, or (3) to subject the material to abnormal conditions of temperature or humidity in order to predict its service behavior.
The conditioning procedures prescribed in this practice are designed to obtain reproducible results and may give physical values somewhat higher or somewhat lower than values under equilibrium at normal conditions, depending upon the particular material and test. To ensure substantial equilibrium under normal conditions of humidity and temperature, however, may require from 20 to 100 days or more depending upon thickness and type of material and its previous history. Consequently, conditioning for reproducibility must of necessity be used for general purchase specifications and product control tests.
SCOPE
1.1 In general, the physical and electrical properties of plastics are influenced by temperature and relative humidity in a manner that materially affects test results. In order that reliable comparisons may be made of different materials and between different laboratories, it is necessary to standardize the humidity conditions, as well as the temperature, to which specimens of these materials are subjected prior to and during testing. This practice defines procedures for conditioning plastics (although not necessarily to equilibrium) prior to testing, and the conditions under which they shall be tested.
1.2 For some materials, there may be a material specification that requires the use of this practice, but with some procedural modifications. The material specification takes precedence over this practice. Refer to the material specification before using this practice. Table 1 in Classification D 4000 lists the ASTM material specifications that currently exist.
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-ISO 291 is related to this practice; however, ISO 291 describes only two temperature and humidity conditions for conditioning or testing, or both.
General Information
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Standards Content (Sample)
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Designation:D618–05
Standard Practice for
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Conditioning Plastics for Testing
This standard is issued under the fixed designation D 618; 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* E 104 Practice for Maintaining Constant Relative Humidity
by Means of Aqueous Solutions
1.1 In general, the physical and electrical properties of
2.2 ISO Standard:
plastics are influenced by temperature and relative humidity in
ISO 291 Plastics—Standard Atmospheres for Conditioning
a manner that materially affects test results. In order that
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and Testing
reliable comparisons may be made of different materials and
betweendifferentlaboratories,itisnecessarytostandardizethe
3. Terminology
humidity conditions, as well as the temperature, to which
3.1 Definitions:
specimens of these materials are subjected prior to and during
3.1.1 room temperature—a temperature in the range from
testing. This practice defines procedures for conditioning
20 to 30°C [68 to 85°F].
plastics (although not necessarily to equilibrium) prior to
3.1.2 standard laboratory atmosphere—an atmosphere hav-
testing, and the conditions under which they shall be tested.
ing a temperature of 23°C [73.4°F] and a relative humidity of
1.2 For some materials, there may be a material specifica-
50 % with standard tolerances as specified in 3.2 shall be the
tion that requires the use of this practice, but with some
standard laboratory atmosphere.
procedural modifications. The material specification takes
3.1.3 standard laboratory temperature—a temperature of
precedence over this practice. Refer to the material specifica-
23°C [73.4°F] with standard tolerance as specified in 3.2 shall
tion before using this practice.Table 1 in Classification D 4000
be the standard laboratory temperature.
lists the ASTM material specifications that currently exist.
3.2 Tolerances:
1.3 This standard does not purport to address all of the
3.3 relative humidity—standard tolerance shall be 65%.
safety concerns, if any, associated with its use. It is the
3.3.1 Discussion—Where the closer tolerance 62 % is re-
responsibility of the user of this standard to establish appro-
quired, it may be specified and the tolerance used reported.
priate safety and health practices and determine the applica-
3.4 standard test temperatures other than standard labora-
bility of regulatory limitations prior to use.
tory temperature—when data are to be obtained for compari-
NOTE 1—ISO 291 is related to this practice; however, ISO 291 de-
son purposes at a specific temperature either above or below
scribes only two temperature and humidity conditions for conditioning or
the standard laboratory temperature, the temperature should be
testing, or both.
selected from the following:
2. Referenced Documents Test Tolerance,
Temperatures, °C [°F] plus or minus, °C [°F]
2
2.1 ASTM Standards:
−70 [−94] 2.0 [3.6]
−55 [−67] 2.0 [3.6]
D 709 Specification for LaminatedThermosetting Materials
−40 [−40] 2.0 [3.6]
D 756 Practice for Determination of Weight and Shape
−25 [−13] 2.0 [3.6]
Changes of Plastics UnderAccelerated Service Conditions
0 [32] 2.0 [3.6]
35 [95] 1.0 [1.8]
D 4000 Classification System for Specifying Plastic Mate-
50 [122] 2.0 [3.6]
rials
70 [158] 2.0 [3.6]
D 5032 Practice for Maintaining Constant Relative Humid-
90 [194] 2.0 [3.6]
105 [221] 2.0 [3.6]
ity by Means of Aqueous Glycerin Solutions
120 [248] 2.0 [3.6]
130 [266] 2.0 [3.6]
155 [311] 2.0 [3.6]
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This practice is under the jurisdiction ofASTM Committee D20 on Plastics and
180 [356] 2.0 [3.6]
is the direct responsibility of Subcommittee D20.50 on Permanence Properties.
200 [392] 3.0 [5.4]
Current edition approved November 1, 2005. Published November 2005. 225 [437] 3.0 [5.4]
Originally approved in 1941. Last previous edition approved in 2000 as D 618 - 00.
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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
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Standards volume information, refer to the standard’s Document Summary page on Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
the ASTM website. 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.
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D618–05
7.1.1.2 A number indicating in degrees Celsius the condi-
Test Tolerance,
Temperatures, °C [°F] plus or minus, °C [°F]
ti
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