ASTM D562-01
(Test Method)Standard Test Method for Consistency of Paints Measuring Krebs Unit (KU) Viscosity Using a Stormer-Type Viscometer
Standard Test Method for Consistency of Paints Measuring Krebs Unit (KU) Viscosity Using a Stormer-Type Viscometer
SCOPE
1.1 This test method covers the measurement of Krebs Unit (KU) viscosity to evaluate the consistency of paints and related coatings using the Stormer-type viscometer.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 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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Designation:D562–01
Standard Test Method for
Consistency of Paints Measuring Krebs Unit (KU) Viscosity
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Using a Stormer-Type Viscometer
This standard is issued under the fixed designation D 562; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 5. Significance and Use
1.1 This test method covers the measurement of Krebs Unit 5.1 This test method provides values that are useful in
(KU) viscosity to evaluatet the consistency of paints and specifying and controlling the consistency of paints, such as
related coatings using the Stormer-type viscometer. consumer or trade sales products.
1.2 The values stated in SI units are to be regarded as the
METHOD A
standard. The values given in parentheses are for information
only. 6. Apparatus
1.3 This standard does not purport to address all of the
6.1 Viscometer, Stormer, with the paddle-type rotor as
safety concerns, if any, associated with its use. It is the
illustrated in Fig. 1 and Fig. 2. The stroboscopic timer
responsibility of the user of this standard to establish appro-
attachment in Fig. 1 can be removed and the instrument used
priate safety and health practices and determine the applica-
without it but with a sacrifice of speed and accuracy. The
bility of regulatory limitations prior to use.
stroboscopic timer gives the 200 r/min reading directly.
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6.2 Container, 500-mL (1-pt), 85 mm(3 ⁄8 in.) in diameter.
2. Referenced Documents
6.3 Thermometer—An ASTM Stormer Viscosity thermom-
2.1 ASTM Standards:
eter having a range from 20 to 70°C and conforming to the
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E1 Specification for ASTM Thermometers
requirements for Thermometer 49C, as prescribed in Specifi-
cationE1.
3. Terminology
6.4 Stopwatch, or suitable timer measuring to 0.2 s.
3.1 Definitions of Terms Specific to This Standard:
6.5 Weights, a set covering the range from 5 to 1000 g.
3.1.1 consistency—load in grams to produce a rotational
frequency of 200 r/min (Stormer Viscometer)
7. Materials
3.1.2 Krebs units (KU)—values of a scale commonly used
7.1 Two standard oils, calibrated in absolute viscosity
to express the consistency of paints generally applied by brush
(poise), that are within the viscosity range of the coatings to be
or roller.
measured. These oils should differ in viscosity by at least 5 P.
3.1.2.1 Discussion—This scale is a function of the “load to
NOTE 1—The normal range of the Stormer is covered by oils having
produce 200-r/min” scale.
viscosities of 4 P (70 KU), 10 P (85 KU), and 14 P (95 KU).
4. Summary of Test Method
7.1.1 Suitable standards are silicone, hydrocarbon, linseed,
4.1 The load required to produce a rotational frequency of and castor oils. Silicone and hydrocarbon oils calibrated in
200 r/min for an offset paddle rotor immersed in a paint is poises are commercially available. Uncalibrated linseed and
determined. castor oils may be calibrated with any apparatus that provides
measurements of absolute viscosity.
7.1.2 Assignavalueofloadtoproduce200r/mintoeachoil
by converting its viscosity value in poises to load in grams by
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This test method is under the jurisdiction of ASTM Committee D01 on Paint
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the following equation:
and Related Coatings, Materials, andApplications and is the direct responsibility of
Subcommittee D01.24 on Physical Properties of Liquid Paints and Paint Materials.
Current edition approved Feb. 10, 2001. Published April 2001. Originally
e1 3
published as D 562 – 47 T. Last previous edition D 562 – 81 (1997) . Geddes, J. A., and Dawson, D. H., “Calculation of Viscosity From Stormer
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Annual Book of ASTM Standards, Vol 14.03. Viscosity Data,” Industrial and Engineering Chemistry, Vol 34, 1942, p. 163.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D562–01
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8. Calibration
8.1 Remove the rotor and weight carrier from the viscom-
eter. Make sure the string is wound evenly on the drum and
does not overlap itself.
8.2 Attach a 5-g weight onto the string and then release the
brake. If the viscometer starts to run from this dead start and
continuestorunthroughseveralrevolutionsofthestringdrum,
it is satisfactory for use. If it does not start unaided when the
5-g weight is applied, the instrument should be reconditioned.
8.3 Check the dimensions of the paddle-type rotor. They
shouldbewithin0.1mm(60.004in.)ofthedimensionsshown
in Fig. 2.
8.4 Select two standard oils having assigned values of load
to produce 200 r/min within the range of the v
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