ASTM D789-05
(Test Method)Standard Test Methods for Determination of Relative Viscosity of Polyamide (PA) 1,2
Standard Test Methods for Determination of Relative Viscosity of Polyamide (PA) <sup>1,2</sup>
SCOPE
1.1 These test methods cover the determination of relative viscosity as they apply to polyamide (PA).
1.2 The values stated in SI units are to be regarded as the standard. The values given in brackets are for information only.
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—This standard and ISO 307 address the same subject, but the technical content is different.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D 789–05
Standard Test Methods for
,
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Determination of Relative Viscosity of Polyamide (PA)
This standard is issued under the fixed designation D 789; 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.
1. Scope* evaluation of materials for specific end uses and as a means for
detecting changes in materials due to specific deteriorating
1.1 These test methods cover the determination of relative
causes.
viscosity as they apply to polyamide (PA).
4.2 Since some materials require special treatment, refer to
1.2 The values stated in SI units are to be regarded as the
theASTM test methods applicable to the material being tested.
standard.Thevaluesgiveninbracketsareforinformationonly.
Classification System D 4000 lists materials that would be
1.3 This standard does not purport to address all of the
applicable to the tests contained in these test methods.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5. Test Specimen
priate safety and health practices and determine the applica-
5.1 Test specimens for the various tests shall conform to the
bility of regulatory limitations prior to use.
requirements prescribed herein.
NOTE 1—This standard and ISO 307 address the same subject, but the
technical content is different.
6. Number of Tests
6.1 One determination shall be considered sufficient for
2. Referenced Documents
testing each molding powder batch or resin lot. Table 1 at the
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2.1 ASTM Standards:
end of this test method gives repeatability and reproducibility
D 446 Specifications and Operating Instructions for Glass
statistics for relative viscosity testing.
Capillary Kinematic Viscometers
D 883 Terminology Relating to Plastics
7. Sampling
D 4000 Classification System for Specifying Plastic Mate-
7.1 The material shall be sampled statistically or the sample
rials
shall come from a process that is in statistical control.
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2.2 ISO Standards:
7.2 Samples in many forms, such as molded powder,
ISO 307 Determination of Viscosity Number of Polyamides
molded shapes, or re-grind are permitted. It is recommended
in Dilute Solutions
thatmoldedspecimensbecutintosmallerpartspriortotesting.
ISO 17025 General Requirements for the Competence of
Testing and Calibration Laboratories
8. Conditioning
8.1 Test Conditions—Do not remove samples from sealed,
3. Terminology
airtight containers until ready for testing.
3.1 Definitions—The definitions used in these test methods
are in accordance with Terminology D 883.
TEST METHOD
4. Significance and Use
9. Relative Viscosity
4.1 These test methods are intended for use as control and
9.1 General—Determine the relative viscosity of the nylon
acceptance tests. They are also applicable in the partial
polymer by ASTM Ubbelohde (Suspended-Level)-type vis-
cometer. The ASTM Ubbelohde-type viscometer is the refer-
ence and referee method. Ostwald-type viscometers, pipet
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This test method is under the jurisdiction ofASTM Committee D20 on Plastics
viscometer, and rotational viscometer are acceptable as an
and is the direct responsibility of Subcommittee D20.15 onThermoplastic Materials
alternative method.
(Section D20.15.09).
Current edition approved July 1, 2005. Published July 2005. Originally approved
in 1944. Last previous edition approved in 2004 as D 789 - 04.
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There is no similar or equivalent ISO standard.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or ThesolesourceofsupplyoftheBrookfieldviscometerknowntothecommittee
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM at this time is Brookfield Engineering Laboratories, Inc., 240 Cushing St.,
Standards volume information, refer to the standard’s Document Summary page on Stoughton, MA02072. If you are aware of alternative suppliers, please provide this
the ASTM website. information to ASTM International Headquarters. Your comments will receive
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Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St., careful consideration at a meeting of the responsible technical committee, which
4th Floor, New York, NY 10036. you may attend.
*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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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.
D789–05
9.2 ASTM Ubbelohde (Suspended Level)-type 9.2
...
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