ASTM D1665-20

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Designation: D1665 − 20
Standard Test Method for
1
Engler Specific Viscosity of Tar Products
This standard is issued under the fixed designation D1665; 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 3.1.1 Engler specific viscosity—the ratio obtained by divid-
ing the time of flow, in s, of 50 mL of material using an Engler
1.1 This test method covers the determination of specific
viscosimeter at a selected temperature by a factor representing
viscosity of tars and their fluid products. It does not determine
the time of flow, in s, for an equal volume of water at 25 °C.
absolute viscosity, but is an empirical flow test. Only by
The usual temperatures for determination of specific viscosity
conforming strictly to requirements of the test method are
of tar materials are 25 °C, 40 °C, 50 °C, and 100 °C, and
reproducible results obtained.
generally the temperature is so selected that the specific
1.2 The values stated in SI units are to be regarded as
viscosity is not more than 45.
standard. No other units of measurement are included in this
standard.
4. Summary of Test Method
1.3 This standard does not purport to address all of the
4.1 The time, in s, is measured for a fixed volume of liquid
safety concerns, if any, associated with its use. It is the
material to flow through an efflux tube under an accurately
responsibility of the user of this standard to establish appro-
reproducible head and at a closely controlled temperature. The
priate safety, health, and environmental practices and deter-
Engler specific viscosity is then calculated by dividing the
mine the applicability of regulatory limitations prior to use.
efflux time by the viscometer calibration factor as determined
1.4 This international standard was developed in accor-
by making the same efflux measurement for water.
dance with internationally recognized principles on standard-
5. Significance and Use
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
5.1 This test method is useful in characterizing the consis-
mendations issued by the World Trade Organization Technical
tency of tar and tar distillates by measuring their flow proper-
Barriers to Trade (TBT) Committee.
ties. It is applicable to materials that are readily liquid at
temperatures up to 100 °C.
2. Referenced Documents
2
6. Apparatus
2.1 ASTM Standards:
D140/D140M Practice for Sampling Asphalt Materials
6.1 Engler Viscosimeter as shown in Fig. 1, consisting of the
D8055 Guide for Selecting an Appropriate Electronic Ther-
following:
mometer for Replacing Mercury Thermometers in D04
6.1.1 Cup—This is a gold-plated cylindrical brass vessel of
Road and Paving Standards
106.0 6 1.0 mm, A, inside diameter, closed at the top by a
E1 Specification for ASTM Liquid-in-Glass Thermometers
double-walled lid. To the rounded bottom is attached a metal-
E11 Specification for Woven Wire Test Sieve Cloth and Test
encased tapered platinum efflux tube 20.0 6 0.1 mm, H, long
Sieves
with an inside diameter of 2.90 6 0.02 mm, E, at the top and
2.80 6 0.02 mm, F, at the bottom. The efflux tube shall project
3. Terminology
through and extend 3.0 6 0.2 mm, G, below a jacket that
surrounds the cup and shall have a bottom outside diameter,
3.1 Definitions:
including its surrounding metal, of 4.5 6 0.2 mm, I. Three
metal measuring points, spaced equidistantly around the cir-
1
This test method is under the jurisdiction of ASTM Committee D04 on Road cumference of the cup, are fastened to the sides and extend
and Paving Materials and is the direct responsibility of Subcommittee D04.43 on
inwardly approximately 7 mm, then turn up at a right angle and
Specifications and Test for Tar and Tar Products.
end in sharp points which are located 52.0 6 0.5 mm, D,
Current edition approved Aug. 1, 2020. Published August 2020. Originally
vertically above the lower end of the efflux tube and 25.0 6
approved in 1959. Last previous edition approved in 2014 as D1665 – 98 (2014).
DOI: 10.1520/D1665-20.
1.0 mm, C, above the lowest portion of the cylindrical sidewall
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
of the cup. They serve both for indicating when the instrument
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
is level and for measuring the charge of material, which is
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. approximately 250 mL.
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