ASTM D3003-94
(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 – 94
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
Pressure Mottling and Blocking Resistance of Organic
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.
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. The equipment shall be capable of producing the required
ings applied to coil-coated or factory-coated metal prior to test pressure in pounds-force per square inch (or kilopascals)
postformed. and be equipped with a suitable device for measuring the force
1.2 The values stated in inch-pound units are to be regarded applied.
as the standard. The values given in parentheses are for
5. Test Specimens and Conditions
information only.
5.1 At least four, and preferably six, flat panels shall be cut
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the from the coated stock, the age of which shall be within the
limits agreed upon between the purchaser and the seller.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 5.2 Panels should be at least 4 by 2.5 in. (100 by 70 mm) to
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
may be used. The minimum recommended size is 2 by 2 in. (50
2.1 Description of Terms Specific to This Standard: by 50 mm).
2.1.1 blocking or sticking 5.3 Use only flat panels. If necessary, file the edges smooth
the condition wherein coated 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 pounds-force per square inch (or kilopascals)
painted sheets or other painted products. is calculated using only the panel area within the pressure
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 heating the purchaser and the seller. Pressures ranging from 110 to 350
elements of the test apparatus are turned off and, after cooling,
psi (750 to 2400 kPa), temperatures from 110 to 140°F (43 to
the specimens are examined for any signs of sticking or 60°C), and times of 2 to 16 h have been used.
blocking, and mottling. The results are rated on the 0 to 10
5.6 In the absence of agreed or specified test conditions, a
scale and may be used in accepting or rejecting the coating pressure of 110 6 5 psi (750 6 35 kPa), a temperature of 1106
according to standards established by the purchaser and the
3°F (43 6 1.5°C), and a time of 16 h shall be used.
seller. 5.7 The total force applied is measured by a suitable gage
and the pounds-force per square inch (or kilopascals) is
1 2
This test method is under the jurisdiction of ASTM Committee D-1 on Paint Suitable equipment includes Pasadena or Studebaker Hydraulic Presses;
and Related Coatings, Materials, and Applications and is the direct responsibility of Gardner Laboratories Cam-activated Pressure Mottling Tester; and drill press vises
Subcommittee D01.53 on Coil Coated Metal. modified for use with a torque wrench if agreed between purchaser and seller
Current edition approved March 15, 1994. Published May 1994. Originally (Hensley, W. L., “Pressure Mottling Test,’’ Journal of Paint Technology, Vol 40, No.
published as D 3003 – 71. Last previous edition D 3003 – 71 (1987). 517, February 1968, p. 54A).
D 3003
calculated by dividing the force (pounds-force or newtons) by 7. Report
the area in square inches (or square millimetres) of one side of
7.1 Report the following information for each coating:
one panel.
7.1.1 Equipment used,
7.1.2 Number of panels tested,
6. Procedure 7.1.3 Pressu
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