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ASTM D7395-07

(Test Method)

Standard Test Method for Cone/Plate Viscosity at a 500 s-1 Shear Rate

Standard Test Method for Cone/Plate Viscosity at a 500 s<sup>-1</sup> Shear Rate

SCOPE
1.1 This test method covers the determination of the viscosity of paints and related products using a cone/plate viscometer at a shear rate of 500 s-1.
1.2 Viscosity values obtained by this method may be used as an alternative to results from No. 4 Ford cup measurements. The values from this method do not replicate Ford cup results, but can be used for quality control, producer-user specifications and viscosity reduction in the same manner that Ford cups are used.
1.3 If viscosity at a higher shear rate is needed, Test Method D 4287, which describes viscosity measurement at 10 000 to 12 000 s-1 may be used.
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.5 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.

General Information

Status
Historical
Publication Date
31-Oct-2007
ICS
87.040 - Paints and varnishes
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.24 - Physical Properties of Liquid Paints & Paint Materials
Current Stage
Ref Project

Relations

Replaced By
ASTM D7395-07(2012) - Standard Test Method for Cone/Plate Viscosity at a 500 s<sup>-1</sup> Shear Rate
Effective Date
01-Feb-2012

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ASTM D7395-07 - Standard Test Method for Cone/Plate Viscosity at a 500 s<sup>-1</sup> Shear RateASTM D7395-07 - Standard Test Method for Cone/Plate Viscosity at a 500 s<sup>-1</sup> Shear Rate
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ASTM D7395-07 - Standard Test Method for Cone/Plate Viscosity at a 500 s<sup>-1</sup> Shear Rate
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D7395 – 07
Standard Test Method for
-1
Cone/Plate Viscosity at a 500 s Shear Rate
This standard is issued under the fixed designation D7395; 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 4. Significance and Use
1.1 This test method covers the determination of the viscos- 4.1 This test has been used to measure viscosities of
ity of paints and related products using a cone/plate viscometer automotive topcoats in place of No. 4 Ford cup measurements
-1
at a shear rate of 500 s . and has provided an equivalent ability to evaluate whether the
1.2 Viscosityvaluesobtainedbythismethodmaybeusedas paint meets specifications and is sprayable.
an alternative to results from No. 4 Ford cup measurements. 4.2 The method could be considered as an alternative to No.
The values from this method do not replicate Ford cup results, 4 Ford cup and other efflux cup measurements for other
but can be used for quality control, producer-user specifica- products as well.
tionsandviscosityreductioninthesamemannerthatFordcups 4.3 The type of viscometer described in this method gives
are used. better temperature control than Ford and other efflux cups and
1.3 If viscosity at a higher shear rate is needed,Test Method is expected to give better precision.
D4287, which describes viscosity measurement at 10 000 to 12 4.4 This test method is suitable for all paints and related
-1
000 s may be used. materials whether they are Newtonian in behavior or not.
1.4 The values stated in SI units are to be regarded as the
5. Apparatus
standard. The values given in parentheses are for information
only. 5.1 Cone/Plate Type Viscometer with cone/speed combina-
-1
tion producing a shear rate of 500 s and fitted with a solvent
1.5 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the trap that covers the cone. For automotive topcoats, the viscom-
eter must provide a viscosity measurement range that includes
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 20 to 200 cP (= mPa.s) at the above-mentioned shear rate. A
Brookfield CAP1000+ or CAP2000+ with a #10 cone at 100
bility of regulatory limitations prior to use.
rpm shaft speed has worked well.
2. Referenced Documents
2 6. Reagents and Materials
2.1 ASTM Standards:
6.1 Water or Solvent—If the viscometer allows manual
D3925 Practice for Sampling Liquid Paints and Related
Pigmented Coatings zeroing, this should be done in accordance with the manufac-
turer’s directions. Zeroing procedures that require liquids may
D4287 Test Method for High-Shear Viscosity Using a
Cone/Plate Viscometer be satisfied with water or a low-viscosity solvent such as
xylene or mineral spirits.
3. Summary of Test Method
6.2 Mineral Oils—One to three standard mineral oils with
3.1 The material to be tested is placed between the cone and known viscosities (certified by an approved laboratory) lying
plate of a cone/plate viscometer set at 25ºC, a solvent trap is between 10 and 90 % full scale to be used for calibrating the
-1
lowered,andthespecimenissubjectedtoashearrateof500s instrument.Ifasingleoilisused,itsviscosityshouldbesimilar
while the viscosity is measured. to that of the materials being tested.
NOTE 1—Silicone oils should be avoided because of their tendency to
contaminate instruments, containers and other equipment.
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
7. Sampling
Subcommittee D01.24 on Physical Properties of Liquid Paints & Paint Materials.
7.1 Take a representative sample of the product to be tested
Current edition approved Nov. 1, 2007. Published November 2007. DOI:
10.1520/D7395-07.
in accordance with Practice D3925. If the sample has a
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
tendency to settle or separate on standing, then it must be
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
stirred or shaken until homogeneous before a test specimen is
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. taken from it. However, it is appropriate to directly test a
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D7395 – 07
NOTE 3—If specimen material is not observed around the entire
sample that has been under constant circulation and shear in a
circumference of the cone, Stop! Clean up, resample and deposit a new
paint system. The specimen must be free of any foreign matter
specimen onto the plate to avoid producing a low viscosity value. Verify
or air bubbles, and its volume must be sufficient to cover the
that the entire specimen is being dispensed from the pipette, syringe or
portion of the viscometer plate under the cone when the latter
other transfer device.
is brought into contact with the plate.
9.3 Wait for 60 s to allow the specimen to reach 25.0ºC and
8. Preparation of Apparatus
equilibrate at that temperature. If the instrument has the
capability of setting times for specific procedures, set the
8.1 The viscometer must be zeroed on a daily basis or
otherwise before use, in accordance with the operating manual HOLD time for 60 s or make certain that the specimen has
equi
...

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