ASTM D6980-17
(Test Method)Standard Test Method for Determination of Moisture in Plastics by Loss in Weight
Standard Test Method for Determination of Moisture in Plastics by Loss in Weight
SIGNIFICANCE AND USE
5.1 This test method is intended for use as a control, acceptance, and assessment test.
5.2 Moisture will affect the processability of some materials. For these materials, defects will occur if they are processed with a moisture content outside of the recommended range.
5.3 The physical properties of some plastics are greatly affected by the moisture content.
SCOPE
1.1 This test method covers the quantitative determination of moisture by means of loss in weight technology down to 50 mg/kg (50 ppm) as it applies to most plastics.
1.2 The values stated in SI units are to be regarded as the standard.
1.3 Specimens tested by this method will be hot, use caution when handling them after testing has been completed.
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 and health practices and determine the applicability of regulatory limitations prior to use.
Note 1: There is no known ISO equivalent to this standard.
1.5 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.
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Standards Content (Sample)
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.
Designation: D6980 − 17
Standard Test Method for
1
Determination of Moisture in Plastics by Loss in Weight
This standard is issued under the fixed designation D6980; 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* 3. Terminology
1.1 This test method covers the quantitative determination 3.1 Definitions—The definitions used in this test method are
of moisture by means of loss in weight technology down to 50 in accordance with Terminologies D883 and D1600.
mg/kg (50 ppm) as it applies to most plastics.
3.2 Symbols:
1.2 The values stated in SI units are to be regarded as the 3.2.1 lift—the result of convection currents created during
standard. the heating of the specimen raising the sample pan off of its
support falsely indicating a moisture loss.
1.3 Specimenstestedbythismethodwillbehot,usecaution
3.2.1.1 Discussion—The effects of lift are compensated for
when handling them after testing has been completed.
in different ways by different manufacturers.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Summary of Test Method
responsibility of the user of this standard to establish appro-
4.1 The specimen is spread onto a sample pan that is
priate safety and health practices and determine the applica-
supported on a balance in a heating chamber that has been
bility of regulatory limitations prior to use.
preheated and equilibrated to the specified idle temperature. It
NOTE 1—There is no known ISO equivalent to this standard.
is then heated to vaporize the moisture. The analysis is
completed when the indicated weight loss falls below a rate
1.5 This international standard was developed in accor-
specified in the test conditions. The total loss of weight is
dance with internationally recognized principles on standard-
integrated and displayed as the percent of moisture.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
4.2 Through adjustment of the analyzer’s parameter
mendations issued by the World Trade Organization Technical
settings, a set of conditions is developed to measure moisture.
Barriers to Trade (TBT) Committee.
5. Significance and Use
2. Referenced Documents
5.1 This test method is intended for use as a control,
2
2.1 ASTM Standards:
acceptance, and assessment test.
D883 Terminology Relating to Plastics
5.2 Moisture will affect the processability of some materi-
D1600 Terminology forAbbreviatedTerms Relating to Plas-
als. For these materials, defects will occur if they are processed
tics
with a moisture content outside of the recommended range.
D6869 Test Method for Coulometric and Volumetric Deter-
5.3 The physical properties of some plastics are greatly
mination of Moisture in Plastics Using the Karl Fischer
affected by the moisture content.
Reaction (the Reaction of Iodine with Water)
E691 Practice for Conducting an Interlaboratory Study to
6. Interferences
Determine the Precision of a Test Method
E2935 Practice for Conducting Equivalence Testing in
6.1 When testing plastic materials for moisture by a loss in
Laboratory Applications weight technique, the possibility exists for volatiles other than
moisture to be evolved and cause a biased high result if the
material has not been dried to remove excess moisture and low
1
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
boiling volatiles. It is important to have a working knowledge
and is the direct responsibility of Subcommittee D20.70 on Analytical Methods.
of the material that is being tested and to remain below any
Current edition approved June 15, 2017. Published August 2017. Originally
melting or decomposition temperatures that would unnecessar-
approved in 2004. Last previous edition approved in 2012 as D6980 - 12. DOI:
10.1520/D6980-17. ily cause the emission of volatiles which can be harmful.
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
7. Apparatus
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 7.1 Moisture Analyzer, containing:
*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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...
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: D6980 − 12 D6980 − 17
Standard Test Method for
1
Determination of Moisture in Plastics by Loss in Weight
This standard is issued under the fixed designation D6980; 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 covers the quantitative determination of moisture by means of loss in weight technology down to 50 mg/kg
(50 ppm) as it applies to most plastics.
1.2 The values stated in SI units are to be regarded as the standard.
1.3 Specimens tested by this method will be hot, use caution when handling them after testing has been completed.
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 and health practices and determine the applicability of regulatory
limitations prior to use.
NOTE 1—There is no known ISO equivalent to this standard.
1.5 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:
D883 Terminology Relating to Plastics
D1600 Terminology for Abbreviated Terms Relating to Plastics
D6869 Test Method for Coulometric and Volumetric Determination of Moisture in Plastics Using the Karl Fischer Reaction (the
Reaction of Iodine with Water)
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
E2935 Practice for Conducting Equivalence Testing in Laboratory Applications
3. Terminology
3.1 Definitions—The definitions used in this test method are in accordance with Terminologies D883 and D1600.
3.2 Symbols:
3.2.1 lift—the result of convection currents created during the heating of the specimen raising the sample pan off of its support
falsely indicating a moisture loss.
1
This test method is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.70 on Analytical Methods.
Current edition approved Feb. 1, 2012June 15, 2017. Published March 2012August 2017. Originally approved in 2004. Last previous edition approved in 20092012 as
D6980 - 09.D6980 - 12. DOI: 10.1520/D6980-12.10.1520/D6980-17.
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.
3.2.1.1 Discussion—
The effects of lift are compensated for in different ways by different manufacturers.
3.2.2 tempering—a process that re-defines the molecular structure of a metal to enhance its performance.
*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 ----------------------
D6980 − 17
4. Summary of Test Method
4.1 The specimen is spread onto a sample pan that is supported on a balance in a heating chamber that has been preheated and
equilibrated to the specified idle temperature. It is then heated to vaporize the moisture. The analysis is completed when the
indicated weight loss falls below a rate specified in the test conditions. The total loss of weight is integrated and displayed as the
percent of moisture. Both the analyzer’s balance and heater are calibrated to NIST standards to achieve precise and accurate results.
4.2 Through adjustment of the analyzer’s parameter settings, a set of conditions is developed to measure moisture.
5. Significance and Use
5.1 This test method is intended for use as a control, acceptance, and assessment test.
5.2 Moisture will affect the processability of some materials. For these materials, defects will occur if they are processed with
a moisture content outside of the recommended range.
5.3 The physical properties of some plastics are greatly affected by the moisture content.
6. Interferences
6.1 When testing plastic materials for moisture by a loss in weight technique, the possibility exists for volatiles
...
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