ASTM D2556-14(2018)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D2556 − 14 (Reapproved 2018)
Standard Test Method for
Apparent Viscosity of Adhesives Having Shear-Rate-
Dependent Flow Properties Using Rotational Viscometry
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 U.S. Department of Defense.
1. Scope 3.1.3 non-Newtonian behavior, n—the property of a liquid
in which its viscosity is not constant over a stated range of
1.1 This test method covers the measurement of the appar-
strain rates.
ent viscosity of shear-rate-dependent adhesives using a rota-
tional viscometer. 3.2 Definitions of Terms Specific to This Standard:
3.2.1 apparent viscosity, n—resistance to shear at a given
1.2 The values stated in SI units are to be regarded as
rate of shear, expressed as viscosity in mPa·s.
standard. No other units of measurement are included in this
standard.
NOTE 1—The SI unit of mPa·s is equivalent to cP.
1.3 This standard does not purport to address all of the 3.2.2 thixotropic index, n—the ratio of apparent viscosities
safety concerns, if any, associated with its use. It is the at two rotational speeds.
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter- 4. Significance and Use
mine the applicability of regulatory limitations prior to use.
4.1 The principle of measurement is based upon a reversible
1.4 This international standard was developed in accor-
isothermal change in apparent viscosity with change in rate of
dance with internationally recognized principles on standard-
shear produced by a change in rotational speed.
ization established in the Decision on Principles for the
4.2 Measurement is performed with a rotational viscometer
Development of International Standards, Guides and Recom-
under standardized conditions with rigid control of the time
mendations issued by the World Trade Organization Technical
intervals of measurement. Viscosity readings are obtained at
Barriers to Trade (TBT) Committee.
the end of 1 min for each rotational speed. Changes from the
lowest speed to the highest speed, and return to the lowest
2. Referenced Documents
speed, are made without stopping the instrument.
2.1 ASTM Standards:
D907 Terminology of Adhesives
5. Apparatus
5.1 Rotational Viscometer—The essential instrumentation
3. Terminology
required providing the minimum rotational viscometer analyti-
3.1 Definitions:
cal capabilities include:
3.1.1 Many terms in this test method are defined in Termi-
5.1.1 A drive motor, to apply a unidirection rotational
nology D907.
displacement to the specimen at a rate of 0.2 revolutions per
3.1.2 Newtonian behavior, n—the property of a liquid in
minute to 60 rev/min constant to within 61%.
which its viscosity is constant over a stated range of strain
5.1.2 Aforce sensor to measure the torque developed by the
rates. (Compare non-Newtonian behavior.)
specimen to within 61%.
5.1.3 A coupling shaft or other means to transmit the
rotational displacement from the motor to the specimen.
This test method is under the jurisdiction of ASTM Committee D14 on
5.1.4 A spindle, geometry, tool, or rotational element to fix
Adhesives and is the direct responsibility of Subcommittee D14.10 on Working
the specimen between the drive shaft and a stationary position.
Properties.
Current edition approved Nov. 1, 2018. Published November 2018. Originally
NOTE 2—Each rotational element typically covers a range of 1.5
approved in 1966. Last previous edition approved in 2014 as D2556 – 14. DOI:
decades of viscosity. The rotational element may be a spindle, disk, T-bar,
10.1520/D2556-14R18.
coaxial cylinder of other configuration selected by mutual agreement
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
among the parties involved.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on NOTE 3—Do not use a scored, warped, or otherwise damaged rotational
the ASTM website. element.
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D2556 − 14 (2018)
5.1.5 Aspecimen container with capacity to contain the test 7.7 Repeat step 7.6 until the maximum readable
specimen during testing. torque (90 % full scale) is achieved.
7.8 Decrease the rotational speed to the next lower rota-
NOTE 4—The size of the container used is determined by the size and
design of the rotational element used.The container used may be specified
tional speed setting and maintain this speed for 60 6 2s.
by mutual agreement among the parties involved.
Record the rotational speed and the apparent viscosity deter-
5.1.6 A guard to protect the geometry from mechanical mined from the measured torque value according to the
damage. manufacturer’s operations manual.
5.1.7 A temp
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