ASTM D789-07
(Test Method)Standard Test Methods for Determination of Solution Viscosities of Polyamide (PA)
Standard Test Methods for Determination of Solution Viscosities of Polyamide (PA)
SCOPE
1.1 These test methods cover the determination of solution viscosities 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.
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Designation:D789–07
Standard Test Methods for
,
1 2
Determination of Solution Viscosities of Polyamide (PA)
This standard is issued under the fixed designation D789; 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 These test methods cover the determination of solution 3.1 Definitions—The definitions used in these test methods
viscosities as they apply to polyamide (PA). are in accordance with Terminology D883.
1.2 The values stated in SI units are to be regarded as
4. Significance and Use
standard.Thevaluesgiveninbracketsareforinformationonly.
1.3 This standard does not purport to address all of the 4.1 These test methods are intended for use as control and
acceptance tests. They are also applicable in the partial
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- evaluation of materials for specific end uses and as a means for
detecting changes in materials due to specific deteriorating
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. causes.
4.2 Since some materials require special treatment, refer to
NOTE 1—This standard and ISO 307 address the same subject, but the
theASTM test methods applicable to the material being tested.
technical content is different.
Classification System D4000 lists materials that would be
2. Referenced Documents applicable to the tests contained in these test methods.
3
4.3 The steps involved in running this method are:
2.1 ASTM Standards:
4.3.1 Calibration of the viscometers,
D446 Specifications and Operating Instructions for Glass
4.3.2 Preparation of solutions,
Capillary Kinematic Viscometers
4.3.3 Determination of efflux time,
D883 Terminology Relating to Plastics
4.3.4 Calculation of relative viscosity (which requires the
D4000 Classification System for Specifying Plastic Materi-
following),
als
4.3.4.1 Determining the density of the polymer/formic acid
D6779 Classification System for Polyamide Molding and
solution, and
Extrusion Materials (PA)
4
4.3.4.2 Determining the absolute viscosity of the formic
2.2 ISO Standards:
acid used.
ISO 307 Determination of Viscosity Number of Polyamides
4.4 Viscosity for groups 03, 04, and 05 (PA11, PA12, and
in Dilute Solutions
PA6,12) in Classification System D6779 shall be measured
ISO 17025 General Requirements for the Competence of
using solvents other than formic acid. Relative viscosities for
Testing and Calibration Laboratories
Groups 03 and 04 shall be measured using 0.5 g of polymer
dissolved in 99.5 g of m-cresol at 25.0 6 0.1°C in a
Cannon-Fenske No. 200 viscometer. Inherent viscosity of
1
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
Group 05 shall be measured using 0.5 g of polymer dissolved
and is the direct responsibility of Subcommittee D20.15 onThermoplastic Materials
in100mLofm-cresolat25.0 60.1°CinaCannon-FenskeNo.
(Section D20.15.09).
200viscometer.Theinherentviscosityiscalculatedasfollows:
Current edition approved Sept. 1, 2007. Published September 2007. Originally
approved in 1944. Last previous edition approved in 2006 as D789 - 06a. DOI:
ln t /t
~ !
s c
10.1520/D0789-07.
Inherent viscosity 5 (1)
2 C
There is no similar or equivalent ISO standard.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
where:
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
t = average efflux time for sample solution,
s
the ASTM website.
t = average efflux time for solvent, and
c
4
Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
C = concentration in g/100 mL
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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D789–07
5. Test Specimen and/or mercury containing products into your state may be
prohibited by state law.)
5.1 Test specimens for the various tests shall conform to the
9.2.1.3 Ubbelohde (Suspended Level)-type Viscometer),
requirements prescribed herein.
calibrated by an ISO 17025-accredited laboratory or in accor-
dance with the procedure set out in 9.2.3 and manufactured
6. Number of Tests
from low-expansion borosilicate glass.
6.1 One determination shall be considered sufficient for
9.2.1.4 Ostwald-type Viscometer, calibrated by an
testing each molding powder batch or
...
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