ASTM D789-06
(Test Method)Standard Test Methods for Determination of Relative Viscosity of Polyamide (PA)
Standard Test Methods for Determination of Relative Viscosity of Polyamide (PA)
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 standard. The values given in brackets are for information only.
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
Relations
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 789–06
Standard Test Methods for
,
1 2
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* 4. Significance and Use
1.1 These test methods cover the determination of relative 4.1 These test methods are intended for use as control and
viscosity as they apply to polyamide (PA). acceptance tests. They are also applicable in the partial
1.2 The values stated in SI units are to be regarded as evaluation of materials for specific end uses and as a means for
standard.Thevaluesgiveninbracketsareforinformationonly. detecting changes in materials due to specific deteriorating
1.3 This standard does not purport to address all of the causes.
safety concerns, if any, associated with its use. It is the 4.2 Since some materials require special treatment, refer to
responsibility of the user of this standard to establish appro- theASTM test methods applicable to the material being tested.
priate safety and health practices and determine the applica- Classification System D 4000 lists materials that would be
bility of regulatory limitations prior to use. applicable to the tests contained in these test methods.
4.3 The steps involved in running this method are:
NOTE 1—This standard and ISO 307 address the same subject, but the
4.3.1 Calibration of the viscometers,
technical content is different.
4.3.2 Preparation of solutions,
2. Referenced Documents 4.3.3 Determination of efflux time,
3
4.3.4 Calculation of relative viscosity (which requires the
2.1 ASTM Standards:
following),
D 446 Specifications and Operating Instructions for Glass
4.3.4.1 Determining the density of the polymer/formic acid
Capillary Kinematic Viscometers
solution, and
D 883 Terminology Relating to Plastics
4.3.4.2 Determining the absolute viscosity of the formic
D 4000 Classification System for Specifying Plastic Mate-
acid used.
rials
4.4 Viscosity for groups 03, 04, and 05 (PA11, PA12, and
D 6779 Classification System for Polyamide Molding and
PA6,12) in Classification System D 6779 shall be measured
Extrusion Materials (PA)
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using solvents other than formic acid. Relative viscosities for
2.2 ISO Standards:
Groups 03 and 04 shall be measured using 0.5 g of polymer
ISO 307 Determination of Viscosity Number of Polyamides
dissolved in 99.5 g of m-cresol at 25.0 6 0.1°C in a
in Dilute Solutions
Cannon-Fenske No. 200 viscometer. Inherent viscosity of
ISO 17025 General Requirements for the Competence of
Group 05 shall be measured using 0.5 g of polymer dissolved
Testing and Calibration Laboratories
in100mLofm-cresolat25.0 60.1°CinaCannon-FenskeNo.
3. Terminology
200 viscometer.The inherent viscosity is calculated as follows:
3.1 Definitions—The definitions used in these test methods
ln~t /t !
s c
Inherent viscosity 5 (1)
are in accordance with Terminology D 883.
C
where:
1
This test method is under the jurisdiction ofASTM Committee D20 on Plastics t = average efflux time for sample solution,
s
and is the direct responsibility of Subcommittee D20.15 onThermoplastic Materials
t = average efflux time for solvent, and
c
(Section D20.15.09).
C = concentration in g/100 mL
Current edition approved March 15, 2006. Published April 2006. Originally
approved in 1944. Last previous edition approved in 2005 as D 789 - 05.
5. Test Specimen
2
There is no similar or equivalent ISO standard.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.1 Test specimens for the various tests shall conform to the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
requirements prescribed herein.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
4
Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
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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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.
D789–06
6. Number of Tests 9.2.1.5 Pipet Viscometer, calibrated by an ISO 17025-
accredited laboratory or in accordance with the procedure set
6.1 One determination shall be considered sufficient for
out in 9.2.4, 25 mL and manufactured from low expansion
testing each molding powder batch or resin lot. Table 1 gives
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