ASTM D789-04
(Test Method)Standard Test Method for Determination of Relative Viscosity of Polyamide (PA)
Standard Test Method for Determination of Relative Viscosity of Polyamide (PA)
SCOPE
1.1 This test method covers the determination of relative viscosity as it applies to polyamide (PA).
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses 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—There is no similar or equivalent ISO standard.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 789–04
Standard Test Method 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* 5. Test Specimen
1.1 This test method covers the determination of relative 5.1 Test specimens for the various tests shall conform to the
viscosity as it applies to polyamide (PA). requirements prescribed herein.
1.2 The values stated in SI units are to be regarded as the
6. Number of Tests
standard. The values given in parentheses are for information
only. 6.1 One determination shall be considered sufficient for
testing each molding powder batch or resin lot. Table 1 at the
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the end of this test method gives repeatability and reproducibility
statistics for relative viscosity testing.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
7. Sampling
bility of regulatory limitations prior to use.
7.1 The material shall be sampled statistically or the sample
NOTE 1—There is no similar or equivalent ISO standard.
shall come from a process that is in statistical control.
7.2 Samples in many forms, such as molded powder,
2. Referenced Documents
molded shapes, or re-grind are permitted. It is recommended
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2.1 ASTM Standards:
thatmoldedspecimensbecutintosmallerpartspriortotesting.
D 883 Terminology Relating to Plastics
D 4000 Classification System for Specifying Plastic Mate-
8. Conditioning
rials
8.1 Test Conditions—Do not remove samples from sealed,
airtight containers until ready for testing.
3. Terminology
3.1 Definitions—The definitions used in this test method is
TEST METHOD
in accordance with Terminology D 883.
9. Relative Viscosity
4. Significance and Use
9.1 General—Determine the relative viscosity of the nylon
4.1 This test method is intended for use as a control and
polymer by either the pipet viscometer method (9.2) or the
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acceptance test. It is also applicable in the partial evaluation of
Brookfield viscometer method (9.3). The pipet viscometer
materials for specific end uses and as a means for detecting
method is the referee method.
changes in materials due to specific deteriorating causes.
9.2 Pipet Viscosity:
4.2 Since some materials require special treatment, refer to
9.2.1 Apparatus:
theASTM test methods applicable to the material being tested.
9.2.1.1 Constant-Temperature Water Bath, set to operate at
Classification System D 4000 lists materials that would be
25 6 0.1°C.
applicable to the test contained in this test method.
9.2.1.2 Precision Thermometer, calibrated, for use in the
water bath.
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9.2.1.3 Pipet Viscometer, calibrated, 25-mL.
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This test method is under the jurisdiction ofASTM Committee D20 on Plastics
9.2.1.4 Ostwald Viscometer, calibrated.
and is the direct responsibility of Subcommittee D20.15 onThermoplastic Materials
9.2.1.5 Pycnometer, calibrated, 50-mL.
(Section D20.15.09).
Current edition approved May 1, 2004. Published June 2004. Originally
approved in 1944. Last previous edition approved in 1998 as D 789 - 98.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or A Brookfield viscometer is available from Brookfield Engineering Laborato-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM ries, Inc., 240 Cushing St., Stoughton, MA 02072.
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Standards volume information, refer to the standard’s Document Summary page on Drawing No. 66-1644, available from the Scientific Glass Apparatus Co., 51
the ASTM website. Ackerman St., Bloomfield, NJ 07003.
*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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D789–04
9.2.1.6 Automatic Pipet, calibrated, 100-mL. This value shall be used in calculating the relative viscosity
9.2.1.7 Erlenmeyer Flasks, 250-mL, heat-resistant glass. of a polymer solution, as shown in 9.2.8.
9.2.1.8 Shaking Machine.
9.2.5 Calibration of Ostwald Viscometer—Add to the vis-
9.2.1.9 Rubber Bulbs.
cometer 10 mL of Oil S-3 at approximately 25°C from a
9.2.1.10 Timer, accurate to 0.2 s.
volumetric pipet. Immerse the viscometer in the constant-
9.2.1.11 With the exception of the pipet and Ostwald
temperature bath at 25 6 0.1°C and allow it to remain at least
viscometers, apparatus capable of equivalent accuracy may be
20 min. Apply air press
...
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