ASTM D6980-12
(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
This test method is intended for use as a control, acceptance, and assessment test.
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.
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 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.
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Designation: D6980 − 12
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 3.2.1.1 Discussion—The effects of lift are compensated for
in different ways by different manufacturers.
1.1 This test method covers the quantitative determination
3.2.2 tempering—a process that re-defines the molecular
of moisture by means of loss in weight technology down to 50
structure of a metal to enhance its performance.
mg/kg as it applies to most plastics.
1.2 The values stated in SI units are to be regarded as the
4. Summary of Test Method
standard.
4.1 The specimen is spread onto a sample pan that is
1.3 Specimenstestedbythismethodwillbehot,usecaution
supported on a balance in a heating chamber that has been
when handling them after testing has been completed.
preheated and equilibrated to the specified idle temperature. It
is then heated to vaporize the moisture. The analysis is
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the completed when the indicated weight loss falls below a rate
specified in the test conditions. The total loss of weight is
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- integrated and displayed as the percent of moisture. Both the
analyzer’s balance and heater are calibrated to NIST standards
bility of regulatory limitations prior to use.
to achieve precise and accurate results.
NOTE 1—There is no known ISO equivalent to this standard.
4.2 Through adjustment of the analyzer’s parameter
2. Referenced Documents
settings, a set of conditions is developed to measure moisture.
2
2.1 ASTM Standards:
5. Significance and Use
D883 Terminology Relating to Plastics
5.1 This test method is intended for use as a control,
D1600 Terminology forAbbreviatedTerms Relating to Plas-
acceptance, and assessment test.
tics
D6869 Test Method for Coulometric and Volumetric Deter-
5.2 Moisture will affect the processability of some materi-
mination of Moisture in Plastics Using the Karl Fischer
als.Forthesematerials,defectswilloccuriftheyareprocessed
Reaction (the Reaction of Iodine with Water)
with a moisture content outside of the recommended range.
E691 Practice for Conducting an Interlaboratory Study to
5.3 The physical properties of some plastics are greatly
Determine the Precision of a Test Method
affected by the moisture content.
3. Terminology
6. Interferences
3.1 Definitions—The definitions used in this test method are
6.1 When testing plastic materials for moisture by a loss in
in accordance with Terminologies D883 and D1600.
weight technique, the possibility exists for volatiles other than
3.2 Symbols: moisture to be evolved and cause a biased high result if the
3.2.1 lift—the result of convection currents created during material has not been dried to remove excess moisture and low
the heating of the specimen raising the sample pan off of its
boiling volatiles. It is important to have a working knowledge
support falsely indicating a moisture loss. of the material that is being tested and to remain below any
melting or decomposition temperatures that would unnecessar-
ily cause the emission of volatiles which can be harmful.
1
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
and is the direct responsibility of Subcommittee D20.70 on Analytical Methods.
7. Apparatus
Current edition approved Feb. 1, 2012. Published March 2012. Originally
7.1 Moisture Analyzer, containing:
approved in 2004. Last previous edition approved in 2009 as D6980 - 09. DOI:
10.1520/D6980-12.
7.1.1 The capability of the oven shall be selected based
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
upon the specific material being tested. Suggested test tem-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
peratures for specific plastics are shown in Tables A1.1 and
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. A2.1.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D6980 − 12
NOTE 2—It will be necessary to contact the analyzer manufacturer for NOTE3—IftestconditionsforaspecificmaterialarenotlistedinAnnex
suggested test temperatures for materials not listed in Tables A1.1 and A1, AnnexA2,or AnnexA3, they wi
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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:D6980–09 Designation:D6980–12
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
1.1 This test method covers the quantitative determination of moisture by means of loss in weight technology down to 50
ppmmg/kg 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 inby this method can reach or exceed 250°C,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.
NOTE1—There is no similar or equivalent ISO standard. 1—There is no known ISO equivalent to this standard.
2. Referenced Documents
2
2.1 ASTM Standards:
D883 Terminology Relating to Plastics
D1600 Terminology for Abbreviated Terms Relating to Plastics
D6869 TestMethodforCoulometricandVolumetricDeterminationofMoistureinPlasticsUsingtheKarlFischerReaction(the
Reaction of Iodine with Water) E177Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
3. Terminology
3.1 DefinitionsDefinitions:
3.1.1The—The definitions used in this test method are in accordance with Terminologies D883 and D1600.
3.1.2
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.
3.1.2.1
3.2.1.1 Discussion—The effects of lift are compensated for in different ways by different manufacturers.
3.1.3
3.2.2 tempering—a process that re-defines the molecular structure of a metal to enhance its performance.
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
percentofmoisture.Boththeanalyzer’sbalanceandheaterarecalibratedtoNISTstandardstoachievepreciseandaccurateresults.
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.
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, 2009.2012. Published March 2009.2012. Originally approved in 2004. Last previous edition approved in 20042009 as D6980 - 049. DOI:
10.1520/D6980-09.10.1520/D6980-12.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D6980–12
5.2Moisture can seriously affect the processability of plastics. It is possible that high moisture content will cause surface
imperfections (that is, splay or bubbling) or degradation by hydrolysis. Low moisture (with high temperature) has been known to
cause solid phase polymerization.
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 other than
watermoisture to be evolved and cause a biased h
...
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