ASTM D4877-04
(Test Method)Standard Test Method for Polyurethane Raw Materials: Determination of APHA Color in Isocyanates
Standard Test Method for Polyurethane Raw Materials: Determination of APHA Color in Isocyanates
SIGNIFICANCE AND USE
This test method can be used for research or for quality control to characterize isocyanates used in polyurethane products.
For toluene diisocyanate, results from this test method can relate to reactivity or performance in polyurethane systems.
SCOPE
1.1 This test method measures the color of clear liquids. It is applicable only to materials whose color-producing bodies have light-absorption characteristics similar to those of the platinum cobalt color standards used. (See Test Method D 1209 and Note 1.)
1.2 The values stated in SI units are to be regarded as the standard.
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 specific hazards statements see 7.1 and Note 2.
Note 1—Although this test method and ISO 6271-1997 differ in some details, data obtained using either are technically equivalent.
General Information
Relations
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D4877–04
Standard Test Method for
Polyurethane Raw Materials: Determination of APHA Color
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in Isocyanates
This standard is issued under the fixed designation D4877; 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 This test method measures the color of clear liquids. It 3.1 For definitions of terms used in this test method see
is applicable only to materials whose color-producing bodies Terminology D883.
have light-absorption characteristics similar to those of the
2 4. Summary of Test Method
platinum cobalt color standards used. (See Test Method
D1209and Note 1.) 4.1 The color of the material to be tested is compared to a
series of platinum cobalt color standards, designated by mg of
1.2 The values stated in SI units are to be regarded as the
standard. Pt/mLofstandardsolution.Theresultsarereportedasthecolor
standard, which best matches the sample (Note 2).
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
NOTE 2—Color of liquids also can be measured by visible spectroscopy
responsibility of the user of this standard to establish appro-
and the results converted to any of several color scales. These results can
priate safety and health practices and determine the applica-
be converted to the APHA scale by appropriate manipulations, as for
bility of regulatory limitations prior to use. For specific example in Test Method D5386.
hazards statements see 7.1 and Warning in 8.1.
5. Significance and Use
NOTE 1—Although this test method and ISO 6271-1997 differ in some
5.1 This test method can be used for research or for quality
details, data obtained using either are technically equivalent.
control to characterize isocyanates used in polyurethane prod-
ucts.
2. Referenced Documents
3
5.2 For toluene diisocyanate, results from this test method
2.1 ASTM Standards:
can relate to reactivity or performance in polyurethane sys-
D883 Terminology Relating to Plastics
tems.
D1193 Specification for Reagent Water
D1209 Test Method for Color of Clear Liquids (Platinum-
6. Apparatus
Cobalt Scale)
6.1 Nessler Tubes, matched, 100-mL tall-form.
D5386 Test Method for Color of Liquids Using Tristimulus
Colorimetry
7. Reagents and Materials
2.2 ISO Standards:
7.1 Purity of Reagents—Reagent grade chemicals shall be
ISO 6271-1997 Clear Liquids—Estimation of Color by the
used in all tests. Unless otherwise indicated, it is intended that
4
Platinum Cobalt Scale
all reagents conform to the specifications of the Committee on
Analytical Reagents of the American Chemical Society where
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5
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
such specifications are available. Other grades can be used,
and is the direct responsibility of Subcommittee D20.22 on Cellular Materials -
provided it is first ascertained that the reagent is of sufficiently
Plastics and Elastomers.
high purity to permit its use without lessening the accuracy of
Current edition approved March 1, 2004. Published April 2004. Originally
approved in 1988. Last previous edition approved in 1998 as D4877 - 98. DOI: the determination.
10.1520/D4877-04.
2
See Standard Methods for the Examination of Water, Sewage, and Industrial
Wastes, AM. Public Health Assn., 1015 15th St. NW Washington, DC 20005.
3 5
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Reagent Chemicals, American Chemical Society Specifications, American
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Chemical Society, Washington, DC. For suggestions on the testing of reagents not
Standards volume information, refer to the standard’s Document Summary page on listed by the American Chemical Society, see Analar Standards for Laboratory
the ASTM website. Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
4
Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St., and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
4th Floor, New York, NY 10036. MD.
*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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D4877–04
TABLE 1 Color Standards
7.2 Purity of Water—Unless otherwise indicated, references
to water shall be understood to mean reagent water as defined Number 500 Standard,
Color Standard Number Water, mL
mL
by Type IV or better of Specification D1193.
1 0.2 99.8
7.3 Cobaltous Chlor
...
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