ASTM D4669-98

Standard Test Method for Polyurethane Raw Materials Determination of Specific Gravity of Polyols

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 problems, 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

• Status: Historical
• Publication Date: 09-Nov-1998
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.22 - Cellular Materials - Plastics and Elastomers

Relations

• Replaced By: ASTM D4669-98(2002)e1 - Standard Test Method for Polyurethane Raw Materials: Determination of Specific Gravity of Polyols
• Effective Date: 10-Nov-2002

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 4669 – 98
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.
1. Scope* 5. Apparatus
1.1 This test method measures the specific gravity of poly- 5.1 Pycnometer, of 25 or 50-mL capacity, conical shape
ols using a pycnometer. (See Note 1.) with a capillary side arm overflow tube complete with a
1.2 This standard does not purport to address all of the standard-taper ⁄12 ground-glass joint to receive a ground-glass
safety concerns, if any, associated with its use. It is the vented cap. A thermometer with a scale graduated from 12 to
responsibility of the user of this standard to establish appro- 38°C in 0.2-degree divisions joins the neck of the flask with a
priate safety and health practices and determine the applica- standard-taper 10/18 ground-glass joint. The thermometer
bility of regulatory limitations prior to use. contained in the pycnometer shall be calibrated in accordance
with Specification E 1.
NOTE 1—There is no equivalent ISO standard.
5.2 Water Bath, capable of maintaining a temperature of
25.0 6 0.05°C during the test.
2. Referenced Documents
5.3 Thermometer, an ASTM Low Softening Point Ther-
2.1 ASTM Standards:
mometer having a range from -2 to +80°C and conforming to
D 883 Terminology Relating to Plastics
3 the requirements for Thermometer 15°C as prescribed in
E 1 Specification for ASTM Thermometers
Specification E 1.
E 202 Test Methods for Analysis of Ethylene Glycols and
4 5.4 Analytical Balance, sensitive to 0.1 mg.
Propylene Glycols.
6. Reagents
3. Terminology
6.1 Chromic Acid Cleaning Solution—Prepare a saturated
3.1 Definitions—For definitions of terms used in this test
solution of chromic acid (CrO ) in concentrated sulfuric acid
method see Terminology D 883.
(H SO , sp gr 1.84).
2 4
3.2 Description of Term Specific to This Standard:
3.2.1 specific gravity—the ratio of the weight in air of a
7. Sampling
given volume of the material at a stated temperature to the
7.1 Polyesters and polyethers usually contain molecules
weight in air of an equal volume of water at a stated
covering an appreciable range of molecular weights. These
temperature. It shall be expressed as specific gravity, 25/25°C,
have a tendency to fractionate during solidification. Unless the
indicating that the sample and reference water were both
material is a finely ground solid it is necessary to melt (using
measured at 25°C.
no higher temperature than necessary) and mix the resin well
before removing a sample for analysis. Since many polyols are
4. Significance and Use
hygroscopic, take care to provide minimum exposure to
4.1 This test method is suitable for quality control, as a
atmospheric moisture during the sampling.
specification test, and for research. It is necessary when
converting from kinematic to absolute viscosity.
8. Procedure
8.1 Clean the pycnometer by filling it with a chromic acid
cleaning solution. Allow it to stand for a few hours, empty, and
This test method is under the jurisdiction of ASTM CommitteeD-20 on Plastics
rinse well with distilled water.
and is the direct responsibility of Subcommittee D20.22 onCellular Plastics. It was
8.2 Fill the pycnometer with freshly boiled distilled water
recommended to ASTM by the Society of the Plastics Industry Polyurethane Raw
cooled to 22 to 24°C, and set the pycnometer thermometer in
Materials Analysis Committee.
Current edition approved Nov. 10, 1998. Published January 1999. Originally
place carefully, avoiding trapping of air. Place the pycnometer
published as D 4669 – 87. Last previous edition D 4669 – 93.
in the water bath that has been maintained at 25.0 6 0.05°C for
Annual Book of ASTM Standards, Vol 08.01.
at least 30 min. Wipe the overflow from the side-arm capillary
Annual Book of ASTM Standards, Vol 14.03.
Annual Book of ASTM Standards, Vol 15.05.
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