Standard Test Method for Porosity of Paint Film

SCOPE
1.1 This test method is applicable to air-dry architectural coatings of any type, both solvent and water-borne, and of any color, dark as well as light. It cannot be used with films that are dissolved or excessively softened by mineral oil, but practical examples of such films will be encountered rarely, if ever.
1.2 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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ASTM D6583-00 - Standard Test Method for Porosity of Paint Film
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D 6583 – 00
Standard Test Method for
Porosity of Paint Film
This standard is issued under the fixed designation D 6583; 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 5. Significance and Use
1.1 This test method is applicable to air-dry architectural 5.1 The porosity of a paint film is closely related to the
coatings of any type, both solvent and water-borne, and of any important practical characteristics of stain resistance, abrasion
color, dark as well as light. It cannot be used with films that are resistance, durability, and the hold-out of any paint subse-
dissolved or excessively softened by mineral oil, but practical quently applied.
examples of such films will be encountered rarely, if ever. 5.2 This test provides a precise means for evaluating and
1.2 This standard does not purport to address all of the comparing the quality of paint films, insofar as it pertains to
safety concerns, if any, associated with its use. It is the porosity as determined on a coating applied to a nonporous
responsibility of the user of this standard to establish appro- substrate. Porosity measured using this test method may not be
priate safety and health practices and determine the applica- an accurate predictor of coating porosity when the coating is
bility of regulatory limitations prior to use. applied to substrate of higher absorption characteristics.
5.3 Unlike current Test Method D 3258 Porosity of Paint
2. Referenced Documents
Films, which is effective only with light colored paints, this test
2.1 ASTM Standards: method is equally effective with paints of any color, both dark
D 1475 Test Method for the Density of Liquid Coatings,
and light. Also unlike Test Method D 3258, its results are not
Inks, and Related Products influenced by the hiding characteristics of the paint film.
D 2369 Test Method for Volatile Content of Coatings
6. Apparatus and Materials
D 3258 Test Method for Porosity of Paint Films
6.1 Bird Type Film Applicator, 150-mm wide with a clear-
3. Terminology
ance of 150 μm.
3.1 Definitions: 6.2 Bird Type Film Applicator, 150-mm wide with a clear-
3.1.1 porosity, n—presence of numerous minute voids in a ance of 100 μm.
cured material; that is, the fraction of air by volume in the dry
6.3 Vacuum Drawdown Plate.
film. 6.4 Test Panel.
6.5 Mineral Oil, specific gravity 0.8200 to 0.8350; viscosity
4. Summary of Test Method
6.5 to 7.8 cSt at 40°C.
4.1 The test paint is applied to a preweighed nonporous
6.6 Absorbent Wipers.
panel, air dried, then reweighed to obtain the weight of the
7. Procedure
film.
4.2 Mineral oil is applied to the surface of the paint film,
7.1 Weigh each test panel to the nearest milligram. Record
allowed to absorb for a fixed period of time, and the excess as W .
p
removed in a specified manner. The test panel is then re-
7.2 Place the test panel on the vacuum plate and apply the
weighed to determine the amount of mineral oil absorbed. paint under test with the 150-μm clearance drawdown blade.
4.3 Porosity is calculated from the weight ratio of absorbed
Remove the test panel from the vacuum plate and air dry as 48
oil to dry paint film and from previously determined values of h under standard conditions of 73 6 3.5°F (23 6 2°C) and 50
non-volatile and density for the whole paint.
6 5 % relative humidity.
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 Transparency film AF 4300, from 3M Visual Systems Division, Austin, TX
Subcommittee D01.42 on Architectural Coatings. 78726-4599 was used in this test method. If you are aware of alternative suppliers,
Current edition approved August 10, 2000. Published October 2000. please provide this information to ASTM Headquarters. Your comments will receive
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Annual Book of ASTM Standards, Vol 06.01. careful consideration at a meeting of the responsible technical committee, which
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