ASTM D3003-01
(Test Method)Standard Test Method for Pressure Mottling and Blocking Resistance of Organic Coatings on Metal Substrates
Standard Test Method for Pressure Mottling and Blocking Resistance of Organic Coatings on Metal Substrates
SCOPE
1.1 This test method covers determination of the pressure mottling and sticking, or blocking resistance of organic coatings applied to coil-coated or factory-coated metal prior to fabrication.
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: D 3003 – 01
Standard Test Method for
Pressure Mottling and Blocking Resistance of Organic
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Coatings on Metal Substrates
This standard is issued under the fixed designation D 3003; 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.
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1. Scope 4. Apparatus
1.1 This test method covers determination of the pressure 4.1 Suitable Hydraulic or Mechanical Press or Vise may be
mottling and sticking, or blocking resistance of organic coat- used.Theequipmentshallbecapableofproducingtherequired
ings applied to coil-coated or factory-coated metal prior to test pressure in kilopascals (or pounds-force per square inch)
fabrication. and be equipped with a suitable device for measuring the force
1.2 The values stated in SI units are to be regarded as the applied.
standard. The values given in parentheses are for information
5. Test Specimens and Conditions
only.
1.3 This standard does not purport to address all of the 5.1 At least four, and preferably six, flat panels shall be cut
from the coated stock, the age of which shall be within the
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- limits agreed upon between the purchaser and the seller.
5.2 Panels should be at least 100 by 70 mm (4 by 2.5 in.) to
priate safety and health practices and determine the applica-
provide an adequate area for assessing the results. Where the
bility of regulatory limitations prior to use.
equipment does not provide adequate pressure, smaller panels
2. Terminology
maybeused.Theminimumrecommendedsizeis50by50mm
2.1 Description of Terms Specific to This Standard: (2 by 2 in.).
2.1.1 blocking or sticking—the condition wherein coated 5.3 Use only flat panels. If necessary, file the edges smooth
surfaces adhere to each other. to ensure maximum contact between the surfaces. When the
2.1.2 pressure mottling—film distortion or uneven pattern equipment permits, panels larger than the pressure plates may
giving a change of gloss and nonuniform appearance. It is be used, thus eliminating any effect from uneven edges. With
usually caused by pressures within a painted coil or stacked this method, the kilopascals (or pounds of force per square
painted sheets or other painted products. inch)iscalculatedusingonlythepanelareawithinthepressure
plates.
3. Summary of Test Method
5.4 The film thickness of the coating under test shall be as
3.1 The coated metal is cut into suitably sized panels. A specified or agreed upon between the purchaser and the seller.
stack of these panels is then subjected to a specified pressure
5.5 The coated stock shall be tested under the conditions of
and temperature for a specified time to permit any pressure pressure, temperature, and time mutually agreed upon between
mottling and sticking or blocking to develop. The applied heat
the purchaser and the seller. Pressures ranging from 750 to
of the test apparatus is turned off and, after cooling, the 2400 kPa (110 to 350 psi), temperatures from 43 to 60°C (110
specimensareexaminedforanysignsofsticking(orblocking),
to 140°F), and times of 2 to 16 h have been used.
and mottling.The results are rated on the 0 to 10 scale and may 5.6 In the absence of agreed or specified test conditions, a
beusedinacceptingorrejectingthecoatinginaccordancewith
pressure of 750 6 35 kPa (110 6 5 psi), a temperature of 43
standards established between the purchaser and the seller.
6 1.5°C (110 6 3°F), and a time of 16 h shall be used.
5.7 The total force applied is measured by a suitable gage
and the pounds of force per kilopascals (or square inch) is
calculated by dividing the force by the area in square inches of
one side of one panel.
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This test method is under the jurisdiction of ASTM Committee D01 on Paint
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and Related Coatings, Materials, andApplications and is the direct responsibility of Suitable equipment includes presses and drill press vises modified for use with
Subcommittee D01.53 on Coil Coated Metal. a torque wrench if agreed upon between purchaser and seller (Hensley, W. L.,
Current edition approved June 10, 2001. Published August 2001. Originally “Pressure Mottling Test,’’ Journal of Paint Technology, Vol 40, No. 517, February
published as D 3003 – 71. Last previous edition D 3003 – 94. 1968, p. 54A).
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D 3003
TABLE 1 Classification
NOTE 1—Intermediate grades are permissible to distinguish small differences.
NOTE 2—Reasonable force is de
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