Standard Test Method for Melting Point of Petroleum Wax (Cooling Curve)

SIGNIFICANCE AND USE
Melting point (cooling curve) is a test that is widely used by wax suppliers and consumers. it is particularly applied to petroleum waxes that are rather highly paraffinic or crystalline in nature. A plateau occurs with specimens containing appreciable amounts of hydrocarbons that crystallize at the same temperature, giving up heat of fusion, thus temporarily retarding the cooling rate. In general, petroleum waxes with large amounts of non-normal hydrocarbons or with amorphous solid forms will not show the plateau.
SCOPE
1.1 This test method covers the determination of the melting point (cooling curve) of petroleum wax. It is unsuitable for waxes of the petrolatum group, microcrystalline waxes, or blends of such waxes with paraffin wax or scale wax. Note 1For additional methods used for testing petroleum waxes, see Test Method D 127 and Test Method D 938. Results may differ, depending on the method used. For pharmaceutical petrolatum, Test Method D 127 usually is used.
1.2 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.
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.

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Publication Date
31-Jan-2007
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ASTM D87-07 - Standard Test Method for Melting Point of Petroleum Wax (Cooling Curve)
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An American National Standard
Designation:D87–07 Technical Association of Pulp
and Paper Industry
Standard Method T 630m-61
Method 1402-Federal Test
Method Standard No. 791b
British Standard 4695
Designation: 55/77(83)
Standard Test Method for
1
Melting Point of Petroleum Wax (Cooling Curve)
ThisstandardisissuedunderthefixeddesignationD 87;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope* 3.1.1 melting point (cooling curve) of petroleum wax—
temperature at which melted petroleum wax first shows a
1.1 Thistestmethodcoversthedeterminationofthemelting
minimum rate of temperature change when allowed to cool
point (cooling curve) of petroleum wax. It is unsuitable for
under prescribed conditions.
waxes of the petrolatum group, microcrystalline waxes, or
blends of such waxes with paraffin wax or scale wax.
NOTE 2—The so-called “American Melting Point” is arbitrarily 1.65°C
(3°F) above the Melting Point (Cooling Curve) of Petroleum Wax.
NOTE 1—For additional methods used for testing petroleum waxes, see
TestMethodD 127andTestMethodD 938.Resultsmaydiffer,depending
4. Summary of Test Method
on the method used. For pharmaceutical petrolatum, Test Method D 127
4.1 In ProcedureA(Manual Method), a specimen of molten
usually is used.
wax in a test tube fitted with a thermometer is placed in an air
1.2 The values stated in SI units are to be regarded as the
bath, which in turn is surrounded by a water bath held at 16 to
standard. The values in parentheses are for information only.
28°C (60 to 80°F).As the molten wax cools, periodic readings
1.3 This standard does not purport to address all of the
of its temperature are taken. When solidification of the wax
safety concerns, if any, associated with its use. It is the
occurs, the rate of temperature decreases, yielding a plateau in
responsibility of the user of this standard to establish appro-
the cooling curve. The temperature at that point is recorded as
priate safety and health practices and determine the applica-
the melting point (cooling curve) of the sample.
bility of regulatory limitations prior to use.
4.2 In Procedure B, an automatic analyzer is used. As the
molten wax cools, the sample temperature decrease is mea-
2. Referenced Documents
2 sured every 15 s in 0.01°C (0.1°F) readings. The melting point
2.1 ASTM Standards:
is considered reached when five consecutive measurements are
D 127 Test Method for Drop Melting Point of Petroleum
constant within a given temperature interval, usually 0.1°C
Wax, Including Petrolatum
(0.2°F).
D 938 Test Method for Congealing Point of Petroleum
Waxes, Including Petrolatum
5. Significance and Use
D 6299 Practice for Applying Statistical Quality Assurance
5.1 Melting point (cooling curve) is a test that is widely
Techniques to Evaluate Analytical Measurement System
used by wax suppliers and consumers. it is particularly applied
Performance
to petroleum waxes that are rather highly paraffinic or crystal-
E1 Specification forASTM Liquid-in-Glass Thermometers
line in nature. A plateau occurs with specimens containing
appreciable amounts of hydrocarbons that crystallize at the
3. Terminology
same temperature, giving up heat of fusion, thus temporarily
3.1 Definition:
retarding the cooling rate. In general, petroleum waxes with
large amounts of non-normal hydrocarbons or with amorphous
1
solid forms will not show the plateau.
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
D02.10.0A on Physical/Chemical Properties.
6. Apparatus
In the IP, this test method is under the jurisdiction of the Standardization
6.1 The necessary apparatus for ProcedureAis described in
Committee. This test method was adopted as a joint ASTM-IP standard in 1966.
Current edition approved Feb. 1, 2007. Published March 2007. Originally Annex A1.
approved in 1921. Last previous edition approved in 2004 as D 87–04.
6.2 The automatic instrument consists of a bath (for ex-
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
ample, an aluminum block with two measuring locations, two
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
apertures to place the test tubes, and two apertures for the
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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