ASTM D6980-09
(Test Method)Test Method for Determination of Moisture in Plastics by Loss in Weight
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 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.
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 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 in this method can reach or exceed 250°C, 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 similar or equivalent ISO standard.
General Information
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Designation:D6980–09
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 3.1.2 tempering—a process that re-defines the molecular
structure of a metal to enhance its performance.
1.1 This test method covers the quantitative determination
of moisture by means of loss in weight technology down to 50
4. Summary of Test Method
ppm as it applies to most plastics.
4.1 The specimen is spread onto a sample pan that is
1.2 The values stated in SI units are to be regarded as the
supported on a balance in a heating chamber that has been
standard.
preheated and equilibrated to the specified idle temperature. It
1.3 Specimens tested in this method can reach or exceed
is then heated to vaporize the moisture. The analysis is
250°C, use caution when handling them after testing has been
completed when the indicated weight loss falls below a rate
completed.
specified in the test conditions. The total loss of weight is
1.4 This standard does not purport to address all of the
integrated and displayed as the percent of moisture. Both the
safety concerns, if any, associated with its use. It is the
analyzer’s balance and heater are calibrated to NIST standards
responsibility of the user of this standard to establish appro-
to achieve precise and accurate results.
priate safety and health practices and determine the applica-
4.2 Through adjustment of the analyzer’s parameter set-
bility of regulatory limitations prior to use.
tings, a set of conditions is developed to measure moisture.
NOTE 1—There is no similar or equivalent ISO standard.
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 can seriously affect the processability of plas-
D1600 Terminology for Abbreviated Terms Relating to
tics. It is possible that high moisture content will cause surface
Plastics
imperfections (that is, splay or bubbling) or degradation by
D6869 Test Method for Coulometric and Volumetric Deter-
hydrolysis. Low moisture (with high temperature) has been
mination of Moisture in Plastics Using the Karl Fischer
known to cause solid phase polymerization.
Reaction (the Reaction of Iodine with Water)
5.3 The physical properties of some plastics are greatly
E177 Practice for Use of the Terms Precision and Bias in
affected by the moisture content.
ASTM Test Methods
6. Interferences
3. Terminology
6.1 When testing plastic materials for moisture by a loss in
3.1 Definitions—The definitions used in this test method are
weight technique, the possibility exists for volatiles other than
in accordance with Terminologies D883 and D1600.
water to be evolved and cause a biased high result if the
3.1.1 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
3.1.1.1 Discussion—The effects of lift are compensated for
melting or decomposition temperatures that would unnecessar-
in different ways by different manufacturers.
ily cause the emission of volatiles which can be harmful.
7. Apparatus
1
3
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
7.1 Moisture Analyzer, containing:
and is the direct responsibility of Subcommittee D20.70 on Analytical Methods.
Current edition approved Feb. 1, 2009. Published March 2009. Originally
approved in 2004. Last previous edition approved in 2004 as D6980 - 04. DOI:
3
10.1520/D6980-09. The model Computrac MAX 2000XL Moisture Analyzer, available from
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Arizona Instrument, LLC, 1912 West 4th Street, Tempe, Arizona, 85281, and the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Mark 2HP Moisture Analyzer, available from Omnimark Instrument Corporation,
Standards volume information, refer to the standard’s Document Summary page on 1320 South Priest Drive, Tempe, Arizona, 85281 have been found satisfactory for
the ASTM website. this purpose, or equivalent.
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 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:D6980–04 Designation:D6980–09
Standard Test Method for
1
Determination of Moisture in Plastics by Loss in Weight
This standard is issued under the fixed designation D 6980; 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 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 in this method can reach or exceed 250°C, 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 similar or equivalent ISO standard.
2. Referenced Documents
2
2.1 ASTM Standards:
D 883 Terminology Relating to Plastics
D 1600 Terminology for Abbreviated Terms Relating to Plastics
D 6869 Test Method for Coulometric and Volumetric Determination of Moisture in Plastics Using the Karl Fischer Reaction
(the Reaction of Iodine withWater)Test Method for Coulometric andVolumetric Determination of Moisture in Plastics Using
the Karl Fischer Reaction (the Reaction of Iodine with Water)
E 177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
3. Terminology
3.1 Definitions—The definitions used in this test method are in accordance with Terminologies D 883 and D 1600.
3.1.1 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.
3.1.1.1 Discussion—The effects of lift are compensated for in different ways by different manufacturers.
3.1.2 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.
5.2 Moisture 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.
5.3 The physical properties of some plastics are greatly affected by the moisture content.
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 July 1, 2004. Published August 2004.
Current edition approved Feb. 1, 2009. Published March 2009. Originally approved in 2004. Last previous edition approved in 2004 as D 6980 - 04.
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
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D6980–09
6. Interferences
6.1 When testing plastic materials for moisture by a loss in weight technique, the possibility exists for volatiles other than water
to be evolved and cause a biased high result if the material has not been dried to remove excess moisture and low boiling volatiles.
It is important to have a working knowledge of the material that is being tested and to remain below any melting or decomposition
temp
...
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