ASTM D1665-98
(Test Method)Standard Test Method for Engler Specific Viscosity of Tar Products
Standard Test Method for Engler Specific Viscosity of Tar Products
SCOPE
1.1 This test method covers the determination of specific viscosity of tars and their fluid products. It does not determine absolute viscosity, but is an empirical flow test. Only by conforming strictly to requirements of the test method are reproducible results obtained.
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. >
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Designation: D 1665 – 98
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
1
Engler Specific Viscosity of Tar Products
This standard is issued under the fixed designation D 1665; 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. Significance and Use
1.1 This test method covers the determination of specific 5.1 This test method is useful in characterizing the consis-
viscosity of tars and their fluid products. It does not determine tency of tar and tar distillates by measuring their flow proper-
absolute viscosity, but is an empirical flow test. Only by ties. It is applicable to materials that are readily liquid at
conforming strictly to requirements of the test method are temperatures up to 100°C.
reproducible results obtained.
6. Apparatus
1.2 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the 6.1 Engler Viscosimeter as shown in Fig. 1, consisting of
the following:
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 6.1.1 Cup—This is a gold-plated cylindrical brass vessel of
106.0 6 1.0 mm, A, inside diameter, closed at the top by a
bility of regulatory limitations prior to use.
double walled lid. To the rounded bottom is attached a
2. Referenced Documents
metal-encased tapered platinum efflux tube 20.06 0.1 mm, H,
2.1 ASTM Standards: long with an inside diameter of 2.906 0.02 mm, E, at the top
2
D 140 Practice for Sampling Bituminous Materials and 2.806 0.02 mm, F, at the bottom. The efflux tube shall
3
E 1 Specification for ASTM Thermometers project through and extend 3.0 6 0.2 mm, G, below a jacket
E 11 Specification for Wire-Cloth Sieves for Testing Pur- that surrounds the cup and shall have a bottom outside
4
poses diameter, including its surrounding metal, of 4.5 6 0.2 mm, I.
Three metal measuring points, spaced equidistantly around the
3. Terminology
circumference of the cup, are fastened to the sides and extend
3.1 Definition: inwardly approximately 7 mm, then turn up at a right angle and
3.1.1 Engler specific viscosity—the ratio obtained by divid-
end in sharp points which are located 52.0 6 0.5 mm, D,
ing the time of flow, in s, of 50 mL of material using an Engler vertically above the lower end of the efflux tube and 25.0 6 1.0
viscosimeter at a selected temperature by a factor representing
mm, C, above the lowest portion of the cylindrical sidewall of
the time of flow, in s, for an equal volume of water at 25°C. The the cup. They serve both for indicating when the instrument is
usual temperatures for determination of specific viscosity of tar
level and for measuring the charge of material, which is
materials are 25°C, 40°C, 50°C, and 100°C, and generally the approximately 250 mL.
temperature is so selected that the specific viscosity is not more 6.1.2 Jacket—The cup is surrounded by a jacket which
than 45.
holds water or other suitable liquid serving as a constant
temperature bath. In the type illustrated, the jacket is provided
4. Summary of Test Method
with a thermometer clamp and stirring device. A tripod
4.1 The time, in s, is measured for a fixed volume of liquid
supports the apparatus and also carries a ring burner by means
material to flow through an efflux tube under an accurately
of which the bath is heated. Adjustable legs on the tripod serve
reproducible head and at a closely controlled temperature. The
to level the instrument. Other arrangements of outer baths,
Engler specific viscosity is then calculated by dividing the
supports, and stirring devices are acceptable, especially when it
efflux time by the viscometer calibration factor as determined
is desired to use more than one standardized cup in a single
by making the same efflux measurement for water.
bath.
6.1.3 Stopper—The efflux tube in the cup is closed or
opened by the insertion or withdrawal of a tapered hardwood
1
This test method is under the jurisdiction of ASTM Committee D-4 on Road
stopper which, to leave the tube open, can be suspended by its
and Paving Materials and is the direct responsibility of Subcommittee D04.43 on
brass pin from the hook on the cover. The stopper shall be a
Specifications and Tests for Tar and Tar Products.
Current edition approved January 10, 1998. Published February 1999. Originally
smooth, round wooden rod 180 mm long and 8 mm in
published as D 1665 – 59 T. Previous edition D 1665 – 91.
diameter, with a brass wire pin 20 mm
...
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