ASTM D789-98

Standard Test Methods for Determination of Relative Viscosity and Moisture Content of Polyamide (PA)

SCOPE
1.1 These test methods cover the determination of relative viscosity, and moisture content 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 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. For a specific statement on safety, see 10.4.

General Information

• Status: Historical
• Publication Date: 09-Nov-1998
• ICS: 83.080.20 - Thermoplastic materials
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.15 - Thermoplastic Materials

Relations

• Replaced By: ASTM D789-04 - Standard Test Method for Determination of Relative Viscosity of Polyamide (PA)
• Effective Date: 01-May-2004
• Referred By: ASTM D6779-23 - Standard Classification System for and Basis of Specification for Polyamide Molding and Extrusion Materials (PA)
• Effective Date: 10-Nov-1998
• Referred By: ASTM D2857-22 - Standard Practice for Dilute Solution Viscosity of Polymers
• Effective Date: 10-Nov-1998
• Referred By: ASTM D2609-21 - Standard Specification for Plastic Insert Fittings for Polyethylene (PE) Plastic Pipe
• Effective Date: 10-Nov-1998
• Referred By: ASTM F2945-18 - Standard Specification for Polyamide 11 Gas Pressure Pipe, Tubing, and Fittings
• Effective Date: 10-Nov-1998
• Referred By: ASTM D4066-13(2019) - Standard Classification System for Nylon Injection and Extrusion Materials (PA)
• Effective Date: 10-Nov-1998
• Referred By: ASTM F3524/F3524M-23 - Standard Specification for Polyamide-12 (PA12) Line Pipe
• Effective Date: 10-Nov-1998
• Referred By: ASTM F2785-21 - Standard Specification for Polyamide 12 Gas Pressure Pipe, Tubing, and Fittings
• Effective Date: 10-Nov-1998
• Referred By: ASTM D5577-19 - Standard Guide for Techniques to Separate and Identify Contaminants in Recycled Plastics
• Effective Date: 10-Nov-1998
• Referred By: ASTM D4000-23 - Standard Classification System for Specifying Plastic Materials
• Effective Date: 10-Nov-1998

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Please contact ASTM International (www.astm.org) for the latest information.
Designation:D 789–98
Standard Test Methods for
Determination of Relative Viscosity and Moisture Content of
1
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 (ϵ) indicates an editorial change since the last revision or reapproval.
1. Scope* D 4000D 4000 lists materials that would be applicable to the
tests contained in these test methods.
1.1 These test methods cover the determination of relative
viscosity and moisture content as they apply to polyamide
5. Test Specimen
(PA).
5.1 Test specimens for the various tests shall conform to the
1.2 The values stated in SI units are to be regarded as the
requirements prescribed herein.
standard. The values given in parentheses are for information
only.
6. Number of Tests
1.3 This standard does not purport to address all of the
6.1 Duplicate determinations, using two separate samples,
safety concerns, if any, associated with its use. It is the
shall be considered sufficient for testing each molding powder
responsibility of the user of this standard to establish appro-
batch or resin lot.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. For a specific
7. Sampling
statement on safety, see 10.4.
7.1 Unless otherwise agreed upon between the purchaser
NOTE 1—There is no similar or equivalent ISO standard.
and the seller, sample the materials in accordance with the
sampling procedure prescribed in Practice D 1898D 1898.
2. Referenced Documents
Adequatestatisticalsamplingshallbeconsideredanacceptable
2.1 ASTM Standards:
alternative.Abatch or lot of resin shall be considered as a unit
2
D 883 Terminology Relating to Plastics
of manufacture as prepared for shipment and may consist of a
2
D 1898 Practice for Sampling of Plastics
blend of two or more “production runs” of material.
D 4000 Classification System for Specifying Plastic Mate-
3
8. Conditioning
rials
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
TEST METHODS
are in accordance with Terminology D 883D 883.
4. Significance and Use 9. Relative Viscosity
9.1 General—Determine the relative viscosity of the nylon
4.1 These test methods are intended for use as control and
acceptance tests. They may be used also in the partial evalua- polymer by either the pipet viscometer method (9.2)orthe
4
Brookfield viscometer method (9.3). The pipet viscometer
tion of materials for specific end uses and as a means for
detecting changes in materials due to specific deteriorating method is the referee method.
9.2 Pipet Viscosity:
causes.
4.2 Since some materials require special treatment, refer- 9.2.1 Apparatus:
9.2.1.1 Constant-Temperature Water Bath, set to operate at
ence should also be made to theASTM test methods applicable
to the material being tested. Classification System 25 6 0.1°C.
9.2.1.2 Precision Thermometer, calibrated, for use in the
water bath.
5
9.2.1.3 Pipet Viscometer, calibrated, 25-mL.
1
These test methods are under the jurisdiction of ASTM Committee D20 on
Plastics and are the direct responsibility of Subcommittee D20.15 on Thermoplastic
Materials (Section D20.15.09).
4
Current edition approved Nov. 10, 1998. Published January 1999. Originally A Brookfield viscometer is available from Brookfield Engineering Laborato-
published as D 789 – 44 T. Last previous edition D 789 – 97. ries, Inc., 240 Cushing St., Stoughton, MA 02072.
2 5
Annual Book of ASTM Standards, Vol 08.01. Drawing No. 66-1644, available from the Scientific Glass Apparatus Co., 51
3
Annual Book of ASTM Standards, Vol 08.02. 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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Please contact ASTM International (www.astm.org) for the latest information.
D789–98
2
9.2.1.4 Ostwald Viscometer, calibrated.
f = kinematic viscosity of S-20 oil, mm /s (cST)/t ,
20 20
2
9.2.1.5 Pycnometer, calibrated, 50-mL.
f = kinematic viscosity of S-60 oil, mm /s (cST)/t ,
60 60
9.2.1.6 Automatic Pipet, calibrated, 100-mL.
t = average efflux time of S-20 oil, s, and
20
9.2.1.7 Erlenmeyer Flasks, 250-mL, heat-resistant glass. t = average efflux time of S-60 oil, s.
60
9.2.1.8 Shaking Machine.
This value shall be used in calculating the relative viscosity
9.2.1.9 Rubber Bulbs.
...