ASTM D3003-01(2016)
(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
ABSTRACT
This test method covers the procedures for determining the pressure mottling and sticking, or blocking resistance of organic coatings applied on coil-coated or factory coated metal substrates prior to fabrication. The coated metal is cut into at least four, preferably six, suitably-sized panels which are then subjected to a specified pressure and temperature for a specified time. After the heat is turned off and the specimen cooled, the samples are examined for any signs of sticking or blocking and mottling.
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:D3003 −01(Reapproved 2016)
Standard Test Method for
Pressure Mottling and Blocking Resistance of Organic
Coatings on Metal Substrates
This standard is issued under the fixed designation D3003; 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. Apparatus
4.1 Suitable Hydraulic or Mechanical Press or Vise may be
1.1 This test method covers determination of the pressure
used.Theequipmentshallbecapableofproducingtherequired
mottling and sticking, or blocking resistance of organic coat-
test pressure in kilopascals (or pounds-force per square inch)
ings applied to coil-coated or factory-coated metal prior to
and be equipped with a suitable device for measuring the force
fabrication.
applied.
1.2 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
5. Test Specimens and Conditions
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
from the coated stock, the age of which shall be within the
safety concerns, if any, associated with its use. It is the
limits agreed upon between the purchaser and the seller.
responsibility of the user of this standard to establish appro-
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
maybeused.Theminimumrecommendedsizeis50by50mm
2. Terminology
(2 by 2 in.).
2.1 Definitions of Terms Specific to This Standard:
5.3 Use only flat panels. If necessary, file the edges smooth
2.1.1 blocking or sticking, n—the condition wherein coated
to ensure maximum contact between the surfaces. When the
surfaces adhere to each other.
equipment permits, panels larger than the pressure plates may
2.1.2 pressure mottling, n—film distortion or uneven pattern
be used, thus eliminating any effect from uneven edges. With
giving a change of gloss and nonuniform appearance. It is
this method, the kilopascals (or pounds of force per square
usually caused by pressures within a painted coil or stacked
inch)iscalculatedusingonlythepanelareawithinthepressure
painted sheets or other painted products.
plates.
5.4 The film thickness of the coating under test shall be as
3. Summary of Test Method
specified or agreed upon between the purchaser and the seller.
3.1 The coated metal is cut into suitably sized panels. A
5.5 The coated stock shall be tested under the conditions of
stack of these panels is then subjected to a specified pressure
pressure, temperature, and time mutually agreed upon between
and temperature for a specified time to permit any pressure
the purchaser and the seller. Pressures ranging from 750 to
mottling and sticking or blocking to develop. The applied heat
2400 kPa (110 to 350 psi), temperatures from 43 to 60°C (110
of the test apparatus is turned off and, after cooling, the
to 140°F), and times of 2 to 16 h have been used.
specimensareexaminedforanysignsofsticking(orblocking),
5.6 In the absence of agreed or specified test conditions, a
and mottling.The results are rated on the 0 to 10 scale and may
pressure of 750 6 35 kPa (110 6 5 psi), a temperature of 43
beusedinacceptingorrejectingthecoatinginaccordancewith
6 1.5°C (110 6 3°F), and a time of 16 h shall be used.
standards established between the purchaser and the seller.
5.7 The total force applied is measured by a suitable gage
and the pounds of force per kilopascals (or square inch) is
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
Subcommittee D01.53 on Coil Coated Metal. Suitable equipment includes presses and drill press vises modified for use with
Current edition approved Dec. 1, 2016. Published December 2016. Originally a torque wrench if agreed upon between purchaser and seller (Hensley, W. L.,
approved in 1971. Last previous edition approved in 2012 as D3003 – 01 (2012). “Pressure Mottling Test,”Journal of Paint Technology, Vol 40, No. 517, February
DOI: 10.1520/D3003-01R16. 1968, p. 54A).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D3003−01(2016)
calculated by dividing the force by the area in square inches of 7. Report
one side of one panel.
7.1 Report the following information for each coating:
7.1.1 Equipment used,
6. Procedure
7.1.2 Number of panels tested,
6.1 Stack the panels face to back as used in production with
7.1.3 Pressure (or force applied and surface area of test
both face and back coatings applied. Limit the number of
coupons),
panels in the test to the quantity that can be heated rapidly to
7.1.4 Temperature and heating process (built-in or oven),
and maintained at the correct panel temperature throughout the
7.1.5 Time,
test.
7.1.6 Grade for sticking or blocking,
6.2 For presses having heating units, place
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D3003 − 01 (Reapproved 2012) D3003 − 01 (Reapproved 2016)
Standard Test Method for
Pressure Mottling and Blocking Resistance of Organic
Coatings on Metal Substrates
This standard is issued under the fixed designation D3003; 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
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.
2. Terminology
2.1 Definitions of Terms Specific to This Standard:
2.1.1 blocking or sticking, n—the condition wherein coated surfaces adhere to each other.
2.1.2 pressure mottling, n—film distortion or uneven pattern giving a change of gloss and nonuniform appearance. It is usually
caused by pressures within a painted coil or stacked painted sheets or other painted products.
3. Summary of Test Method
3.1 The coated metal is cut into suitably sized panels. A stack of these panels is then subjected to a specified pressure and
temperature for a specified time to permit any pressure mottling and sticking or blocking to develop. The applied heat of the test
apparatus is turned off and, after cooling, the specimens are examined for any signs of sticking (or blocking), and mottling. The
results are rated on the 0 to 10 scale and may be used in accepting or rejecting the coating in accordance with standards established
between the purchaser and the seller.
4. Apparatus
4.1 Suitable Hydraulic or Mechanical Press or Vise may be used. The equipment shall be capable of producing the required test
pressure in kilopascals (or pounds-force per square inch) and be equipped with a suitable device for measuring the force applied.
5. Test Specimens and Conditions
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 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 provide an adequate area for assessing the results. Where the
equipment does not provide adequate pressure, smaller panels may be used. The minimum recommended size is 50 by 50 mm (2
by 2 in.).
5.3 Use only flat panels. If necessary, file the edges smooth to ensure maximum contact between the surfaces. When the
equipment permits, panels larger than the pressure plates may be used, thus eliminating any effect from uneven edges. With this
method, the kilopascals (or pounds of force per square inch) is calculated using only the panel area within the pressure plates.
5.4 The film thickness of the coating under test shall be as specified or agreed upon between the purchaser and the seller.
This test method is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.53 on Coil Coated Metal.
Current edition approved June 1, 2012Dec. 1, 2016. Published August 2012December 2016. Originally approved in 1971. Last previous edition approved in 20062012
as D3003 – 01 (2006).(2012). DOI: 10.1520/D3003-01R126.10.1520/D3003-01R16.
Suitable equipment includes presses and drill press vises modified for use with a torque wrench if agreed upon between purchaser and seller (Hensley, W. L., “Pressure
Mottling Test,”Journal of Paint Technology, Vol 40, No. 517, February 1968, p. 54A).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D3003 − 01 (2016)
5.5 The coated stock shall be tested under the conditions of pressure, temperature, and time mutually agreed upon between the
purchaser and the seller. Pressures ranging from 750 to 2400 kPa (110 to 350 psi), temperatures from 43 to 60°C (110 to 140°F),
and times of 2 to 16 h have been used.
5.6 In the absence of agreed or specified test conditions, a pressure of 750 6 35 kPa (110 6 5 psi), a temperature of 43 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.
6. Procedure
6.1 Stack the panels face to back as used in production with both face and back coatings applied. Limit the number of panels
in the test to the quantity that can be heated rapidly to and maintained at the correct panel temperature throughout the test.
6.2 For presses having heating units, place the test panels in the press and bring the heating platens in contact but with light
pressure. Tu
...
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