ASTM D2556-93a(2005)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D2556 – 93a (Reapproved 2005)
Standard Test Method for
Apparent Viscosity of Adhesives Having Shear-Rate-
Dependent Flow Properties
This standard is issued under the fixed designation D2556; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 3.2.1 apparent viscosity, n—resistance to shear at a given
rate of shear, expressed as viscosity in absolute units.
1.1 This test method covers the measurement of the appar-
ent viscosity of shear-rate-dependent adhesives.
4. Significance and Use
1.2 The values stated in SI units are to be regarded as
4.1 Theprincipleofmeasurementisbaseduponareversible
standard. The values given in parentheses are for information
isothermal change in apparent viscosity with change in rate of
only.
shear.
1.3 This standard does not purport to address all of the
4.2 Measurementisperformedwithaspindle,disk,T-bar,or
safety concerns, if any, associated with its use. It is the
coaxial cylinder rotational viscometer under standardized con-
responsibility of the user of this standard to establish appro-
ditions with rigid control of the time intervals of measurement.
priate safety and health practices and determine the applica-
Readings are obtained on the viscometer dial scale at the end
bility of regulatory limitations prior to use.
of 1 min for each rotational speed. Changes from the lowest
2. Referenced Documents speed to the highest speed, and return to the lowest speed, are
made without stopping the instrument.
2.1 ASTM Standards:
D907 Terminology of Adhesives
5. Apparatus
3 3
3. Terminology 5.1 Viscometer—The apparatus consists of a spindle, disk,
3 4
T-bar, or coaxial-type viscometer with appropriate spindles,
3.1 Definitions: Many terms in this test method are defined
disks, T-bars, or cylinders. Do not use a scored, warped, or
in Terminology D907.
otherwise damaged spindle, disk, T-bar, or cylinder. Except
3.1.1 Newtonian behavior, n—the property of a liquid in
when using the coaxial cylinder-type viscometer, the size of
which its viscosity is constant over a stated range of strain
container to be used is determined by mutual agreement. Some
rates. (Compare non-Newtonian behavior.)
instruments have two concentric scales, and care is to be taken
3.1.2 non-Newtonian behavior, n—the property of a liquid
to read the pointer on the correct scale.
in which its viscosity is not constant over a stated range of
5.2 Supporting Stand —Use a support for the viscometer
strain rates.
which consists of a suitable stand with a supporting arm
3.2 Definitions of Terms Specific to This Standard:
capableofbeingloweredorraisedeithermanuallyormechani-
cally.
This test method is under the jurisdiction of ASTM Committee D14 on
Adhesives and is the direct responsibility of Subcommittee D14.10 on Working
Properties. TheBrookfieldSynchro-LectricViscometers,ModelsLV,RV, or HVhave been
Current edition approved Oct. 1, 2005. Published November 2005. Originally found satisfactory for this purpose and are available from the Brookfield Engineer-
approved in 1966. Last previous edition approved in 1997 as D2556 – 93a (1997). ing Laboratories, Stoughton, MA.
DOI: 10.1520/D2556-93AR05. The Ferranti Portable Viscometers, Models VL, VM, or VH have been found
For referenced ASTM standards, visit the ASTM website, www.astm.org, or satisfactory for this test method and are available from Ferranti Electric Inc.,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Plainview, Long Island, NY.
Standards volume information, refer to the standard’s Document Summary page on The Brookfield Helipath Stand or other commercially available stands may be
the ASTM website. used.
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D2556 – 93a (2005)
5.3 Thermometer—Use a precision thermometer, with 7.3 A plot of rotational speed versus apparent viscosity as
graduations not greater than 0.2°C (0.5°F), for temperature determined from the dial readings provides evidence as to
measurements. shear-rate dependency of the material. A value of apparent
viscosity may be obtained from any point on the curve.
6. Conditioning
8. Report
6.1 Condition the adhesive sample and instrument at 23 6
8.1 Report the following information:
0.5°C (73.4 6 1.0°F) (or other temperature agreed upon
8.1.1 Date of test and complete identification of the adhe-
between the adhesive vendor and the purchaser) at least 16 h.
sive tested, including type, source, manufacturer’s code num-
If special conditioning methods are n
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