ASTM D1686-96(2004)
(Test Method)Standard Test Method for Color of Solid Aromatic Hydrocarbons and Related Materials in the Molten State (Platinum-Cobalt Scale)
Standard Test Method for Color of Solid Aromatic Hydrocarbons and Related Materials in the Molten State (Platinum-Cobalt Scale)
SIGNIFICANCE AND USE
Color by this test method is a measure of color-producing impurities present in the thermally stable solids. This test method is suitable for setting specifications and for use as an internal quality control tool.
SCOPE
1.1 This test method covers the visual measurement of the color of thermally stable solids melting below 150oC. It is applicable only to materials in which the color-producing bodies present have light absorption characteristics quite similar to those of the standards used.
1.2 The following applies to all specified limits in this test method: for purposes of determining conformance with this test method, an observed value or a calculated value shall be rounded off "to the nearest unit" in the last right-hand digit used in expressing the specification limit, in accordance with the rounding-off method of Practice E29.
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 specific hazard statements see Sections 7 and 9.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D1686–96(Reapproved2004)
Standard Test Method for
Color of Solid Aromatic Hydrocarbons and Related Materials
1
in the Molten State (Platinum-Cobalt Scale)
This standard is issued under the fixed designation D1686; 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 2.2 Other Document:
OSHA Regulations 29 CFR paragraphs 1910.1000 and
1.1 This test method covers the visual measurement of the
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1910.1200
color of thermally stable solids melting below 150°C. It is
applicable only to materials in which the color-producing
3. Significance and Use
bodies present have light absorption characteristics quite simi-
3.1 Color by this test method is a measure of color-
lar to those of the standards used.
producing impurities present in the thermally stable solids.
1.2 The following applies to all specified limits in this test
This test method is suitable for setting specifications and for
method: for purposes of determining conformance with this
use as an internal quality control tool.
test method, an observed value or a calculated value shall be
rounded off “to the nearest unit” in the last right-hand digit
4. Apparatus
used in expressing the specification limit, in accordance with
4.1 Color Comparison Tubes—Matched 100-mL, tall-form
the rounding-off method of Practice E29.
Nessler tubes, provided with ground-on, optically clear, glass
1.3 This standard does not purport to address all of the
caps.Tubesshouldbeselectedsothattheheightofthe100-mL
safety concerns, if any, associated with its use. It is the
graduation mark is 300 6 3 mm above the bottom of the tube.
responsibility of the user of this standard to establish appro-
The use of heat-resistant tubes is preferred for safety reasons.
priate safety and health practices and determine the applica-
4.2 Color Comparator—A color comparator constructed to
bility of regulatory limitations prior to use. For specific hazard
permit visual comparison of light transmitted through tall-
statements see Sections 7 and 9.
form, 100-mL Nessler tubes in the direction of their longitu-
dinal axes.The comparator should be constructed so that white
2. Referenced Documents
2 light is reflected off a white plate and directed with equal
2.1 ASTM Standards:
intensity through the tubes, and should be shielded so that no
D1193 Specification for Reagent Water
light enters the tubes from the side.
D3438 Practice for Sampling and Handling Naphthalene,
4.3 Oven—An oven, preferably of the forced draft type and
Maleic Anhydride, and Phthalic Anhydride
capable of maintaining a constant temperature 61°C in the
D3852 Practice for Sampling and Handling Phenol,
range up to 150°C. Alternatively, the use of an aluminum
Cresols, and Cresylic Acid
heating block provided with proper temperature control or
E29 Practice for Using Significant Digits in Test Data to
other similar equipment is permissible.
Determine Conformance with Specifications
5. Reagents
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This test method is under the jurisdiction of ASTM Committee D16 on
5.1 Purity of Reagents—Reagent grade chemicals shall be
Aromatic Hydrocarbons and Related Chemicals and is the direct responsibility of
used in all tests. Unless otherwise indicated, it is intended that
Subcommittee D16.02 on Oxygenated Aromatics.
all reagents shall conform to the specifications of the Commit-
Current edition approved June 1, 2004. Published June 2004. Originally
approved in 1959. Last previous edition approved in 2000 as D1686 – 96 (2000). tee onAnalytical Reagents of theAmerican Chemical Society,
DOI: 10.1520/D1686-96R04.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM AvailablefromU.S.GovernmentPrintingOfficeSuperintendentofDocuments,
Standards volume information, refer to the standard’s Document Summary page on 732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http://
the ASTM website. www.access.gpo.gov.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D1686–96 (2004)
A
TABLE 1 Platinum-Cobalt Color Standards
9. Procedure
Color Stock Color Stock
9.1 Melt approximately 150 g of the sample and simulta-
Standard Solution, Standard Solution,
neously preheat a Nessler tube and cap in an oven maintained
No. mL No. mL
at constant temperature at 10 to 20°C above the solidification
51 35 7
point of the sample. The sample must not be heated to more
10 2 40 8
15 3 50 10
than 20°C above its solidification point.
20 4 60 12
9.2
...
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