Standard Test Method for Porosity of Paint Film by Mineral Oil Absorption

SIGNIFICANCE AND USE
The porosity of a paint film is closely related to the important practical characteristics of stain resistance, abrasion resistance, durability, and the hold-out of any paint subsequently applied.
This test provides a precise means for evaluating and comparing the quality of paint films, insofar as it pertains to porosity as determined on a coating applied to a nonporous substrate. Porosity measured using this test method may not be an accurate predictor of coating porosity when the coating is applied to substrate of higher absorption characteristics.
Unlike current Test Method D3258 Porosity of Paint Films, which is effective only with light colored paints, this test method is equally effective with paints of any color, both dark and light. Also unlike Test Method D3258, its results are not influenced by the hiding characteristics of the 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 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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Publication Date
31-Jan-2010
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ASTM D6583-04(2010) - Standard Test Method for Porosity of Paint Film by Mineral Oil Absorption
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D6583 − 04 (Reapproved 2010)
StandardTest Method for
Porosity of Paint Film by Mineral Oil Absorption
This standard is issued under the fixed designation D6583; 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 4.2 Mineral oil is applied to the surface of the paint film,
allowed to absorb for a fixed period of time, and the excess
1.1 This test method is applicable to air-dry architectural
removed in a specified manner. The test panel is then re-
coatings of any type, both solvent and water-borne, and of any
weighed to determine the amount of mineral oil absorbed.
color, dark as well as light. It cannot be used with films that are
dissolved or excessively softened by mineral oil, but practical 4.3 Porosity is calculated from the weight ratio of absorbed
examples of such films will be encountered rarely, if ever. oil to dry paint film and from previously determined values of
non-volatile and density for the whole paint.
1.2 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
5. Significance and Use
only.
5.1 The porosity of a paint film is closely related to the
1.3 This standard does not purport to address all of the
important practical characteristics of stain resistance, abrasion
safety concerns, if any, associated with its use. It is the
resistance, durability, and the hold-out of any paint subse-
responsibility of the user of this standard to establish appro-
quently applied.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. 5.2 This test provides a precise means for evaluating and
comparing the quality of paint films, insofar as it pertains to
2. Referenced Documents
porosity as determined on a coating applied to a nonporous
substrate. Porosity measured using this test method may not be
2.1 ASTM Standards:
an accurate predictor of coating porosity when the coating is
D1475 Test Method For Density of Liquid Coatings, Inks,
applied to substrate of higher absorption characteristics.
and Related Products
D2369 Test Method for Volatile Content of Coatings
5.3 Unlike current Test Method D3258 Porosity of Paint
D3258 Test Method for Porosity of White or Near White
Films,whichiseffectiveonlywithlightcoloredpaints,thistest
Paint Films by Staining
method is equally effective with paints of any color, both dark
and light. Also unlike Test Method D3258, its results are not
3. Terminology
influenced by the hiding characteristics of the paint film.
3.1 Definitions:
6. Apparatus and Materials
3.1.1 porosity, n—presence of numerous minute voids in a
cured material; that is, the fraction of air by volume in the dry
6.1 Bird Type Film Applicator, 150-mm wide with a clear-
film.
ance of 150 µm.
6.2 Bird Type Film Applicator, 150-mm wide with a clear-
4. Summary of Test Method
ance of 100 µm.
4.1 The test paint is applied to a preweighed nonporous
6.3 Vacuum Drawdown Plate.
panel, air dried, then reweighed to obtain the weight of the
film.
6.4 Test Panel.
6.5 Mineral Oil, specific gravity 0.8200 to 0.8350; viscosity
6.5 to 7.8 cSt at 40°C.
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
6.6 Absorbent Wipers.
Subcommittee D01.42 on Architectural Coatings.
Current edition approved Feb. 1, 2010. Published February 2010. Originally
approved in 2000. Last previous edition approved in 2004 as D6583 – 04. DOI:
10.1520/D6583-04R10. Transparency film AF 4300, from 3M Visual Systems Division, Austin, TX
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 78726-4599 was used in this test method. If you are aware of alternative suppliers,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM please provide this information to ASTM International Headquarters. Your com-
Standards volume information, refer to the standard’s Document Summary page on ments will receive careful consideration at a meeting of the responsible technical
the ASTM website. committee, which you may attend.
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D6583 − 04 (Reapp
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