ASTM D4669-98(2002)e1
(Test Method)Standard Test Method for Polyurethane Raw Materials: Determination of Specific Gravity of Polyols
Standard Test Method for Polyurethane Raw Materials: Determination of Specific Gravity of Polyols
SIGNIFICANCE AND USE
This test method is suitable for quality control, as a specification test, and for research. It is necessary when converting from kinematic to absolute viscosity.
SCOPE
1.1 This test method measures the specific gravity of polyols using a pycnometer. (See Note 1.)
1.2 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 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D 4669 – 98 (Reapproved 2002)
Standard Test Method for
Polyurethane Raw Materials: Determination of Specific
Gravity of Polyols
This standard is issued under the fixed designation D 4669; 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.
e NOTE—Editorially updated the organizational reference in Footnote 1 in November 2002.
1. Scope* 4. Significance and Use
1.1 This test method measures the specific gravity of poly- 4.1 This test method is suitable for quality control, as a
ols using a pycnometer. (See Note 1.) specification test, and for research. It is necessary when
1.2 This standard does not purport to address all of the converting from kinematic to absolute viscosity.
safety concerns, if any, associated with its use. It is the
5. Apparatus
responsibility of the user of this standard to establish appro-
5.1 Pycnometer, of 25 or 50-mL capacity, conical shape
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. with a capillary side arm overflow tube complete with a
standard-taper ⁄12 ground-glass joint to receive a ground-glass
NOTE 1—There is no equivalent ISO standard.
vented cap. A thermometer with a scale graduated from 12 to
38°C in 0.2-degree divisions joins the neck of the flask with a
2. Referenced Documents
2 standard-taper ⁄18 ground-glass joint. The thermometer con-
2.1 ASTM Standards:
tained in the pycnometer shall be calibrated in accordance with
D 883 Terminology Relating to Plastics
Specification E 1.
E 1 Specification for ASTM Thermometers
5.2 Water Bath, capable of maintaining a temperature of
E 202 Test Methods for Analysis of Ethylene Glycols and
25.0 6 0.05°C during the test.
Propylene Glycols
5.3 Thermometer, an ASTM Low Softening Point Ther-
mometer having a range from -2 to +80°C and conforming to
3. Terminology
the requirements for Thermometer 15°C as prescribed in
3.1 Definitions—For definitions of terms used in this test
Specification E 1.
method see Terminology D 883.
5.4 Analytical Balance, sensitive to 0.1 mg.
3.2 Description of Term Specific to This Standard:
3.2.1 specific gravity—the ratio of the weight in air of a
6. Reagents
given volume of the material at a stated temperature to the
6.1 Chromic Acid Cleaning Solution—Prepare a saturated
weight in air of an equal volume of water at a stated
solution of chromic acid (CrO ) in concentrated sulfuric acid
temperature. It shall be expressed as specific gravity, 25/25°C,
(H SO , sp gr 1.84).
2 4
indicating that the sample and reference water were both
measured at 25°C.
7. Sampling
7.1 Polyesters and polyethers usually contain molecules
covering an appreciable range of molecular weights. These
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
and is the direct responsibility of Subcommittee D20.22 on Cellular Materials—
have a tendency to fractionate during solidification. Unless the
Plastics and Elastomers. It was recommended to ASTM by the Alliance for the
material is a finely ground solid it is necessary to melt (using
Polyurethane Industry’s Polyurethane Raw Materials Analysis Committee.
no higher temperature than necessary) and mix the resin well
Current edition approved November 10, 2002. Published January 2003. Origi-
before removing a sample for analysis. Since many polyols are
nally approved in 1987. Last previous edition approved in 1996 as D 4669 – 98.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
hygroscopic, take care to provide minimum exposure to
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
atmospheric moisture during the sampling.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
*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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D 4669 – 98 (2002)
8. Procedure
where:
S = sample used, g, and
8.1 Clean the pycnometer by filling it with a chromic acid
W
...
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