ASTM D6583-13(2019)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D6583 − 13 (Reapproved 2019)
Standard Test 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 3. Terminology
3.1 Definitions:
1.1 This test method is applicable to air-dry architectural
3.1.1 porosity, n—presence of numerous minute voids in a
coatings of any type, both solvent and water-borne, and of any
cured material; that is, the fraction of air by volume in the dry
color, dark as well as light. It cannot be used with films that are
film.
dissolved or excessively softened by mineral oil, but practical
examples of such films will be encountered rarely, if ever.
4. Summary of Test Method
1.2 The values stated in SI units are to be regarded as
4.1 The test paint is applied to a preweighed nonporous
standard. No other units of measurement are included in this
panel, air dried, then reweighed to obtain the weight of the
standard.
film.
1.3 This standard does not purport to address all of the
4.2 Mineral oil is applied to the surface of the paint film,
safety concerns, if any, associated with its use. It is the
allowed to absorb for a fixed period of time, and the excess
responsibility of the user of this standard to establish appro-
removed in a specified manner. The test panel is then re-
priate safety, health, and environmental practices and deter-
weighed to determine the amount of mineral oil absorbed.
mine the applicability of regulatory limitations prior to use.
4.3 Porosity is calculated from the weight ratio of absorbed
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard- oil to dry paint film and from previously determined values of
non-volatile and density for the whole paint.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
5. Significance and Use
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
5.1 The porosity of a paint film is closely related to the
important practical characteristics of stain resistance, abrasion
2. Referenced Documents
resistance, durability, and the hold-out of any paint subse-
quently applied.
2.1 ASTM Standards:
D1475 Test Method for Density of Liquid Coatings, Inks,
5.2 This test provides a precise means for evaluating and
and Related Products
comparing the quality of paint films, insofar as it pertains to
D2369 Test Method for Volatile Content of Coatings
porosity as determined on a coating applied to a nonporous
D3258 Test Method for Porosity of White or Near White
substrate. Porosity measured using this test method may not be
Paint Films by Staining
an accurate predictor of coating porosity when the coating is
E177 Practice for Use of the Terms Precision and Bias in
applied to substrate of higher absorption characteristics.
ASTM Test Methods
5.3 Unlike current Test Method D3258 Porosity of Paint
E691 Practice for Conducting an Interlaboratory Study to
Films, which is effective only with light-colored paints, this
Determine the Precision of a Test Method
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.
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. Apparatus and Materials
Subcommittee D01.42 on Architectural Coatings.
Current edition approved April 1, 2019. Published April 2019. Originally 6.1 Bird-Type Film Applicator, 150 mm wide with a clear-
approved in 2000. Last previous edition approved in 2013 as D6583 – 13. DOI:
ance of 150 µm.
10.1520/D6583-13R19.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 6.2 Bird-Type Film Applicator, 150 mm wide with a clear-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
ance of 100 µm.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 6.3 Vacuum Drawdown Plate.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D6583 − 13 (2019)
6.4 Test Panel. where:
W = mineral oil absorbed by the paint film, g,
6.5 Mineral Oil, specific gravity 0.8200 to 0.8350; viscosity m
W = oiled test paint, g, and
6.5 to 7.8 cSt at 40 °C. o
W = test panel and paint film, g.
p+f
6.6 Absorbent Wipers.
8.3 Weight Ratio of Absorbed Oil to Dry Paint Film:
8.3.1 Calculate the ratio of absorbed oil to dry paint film R
7. Procedure
as follows:
7.1 Weigh each test panel to the nearest milligram. Record
R 5 W /W (3)
m f
as W .
p
where:
7.2 Place the test panel on the vacuum plate and apply the
paint under test with the 150-µm clearance drawdown blade. R = weight ratio of absorbed oil to dry paint film,
W = mineral oil absorbed by the paint film, g, and
Remove the test panel from the vacuum plate and air dry as 48
m
W = paint film, g.
h under standard conditions of 23 6 2 °C and 50 6 5% f
relative humidity.
8.4 Porosity:
8.4.1 Calculate porosity P as follows:
7.3 Weigh the coated test panel to the nearest milligram.
Record this weight as W .
p+f CRND
P 5 3100 (4)
CRND1d C1ND 2 D
~ !
7.4 Place the coated test panel on the vacuum plate and
apply the mineral oil with the 100-µm clearance drawdown
where:
blade making sure the entire surface of the coating is covered
C = constant of:
by the oil.
1.00 for water-based systems, and
7.5 After 3 min, wipe off excess mineral oil with the
0.78 for solvent-based systems.
absorbent wipers. Hold the test panel at an angle to a light
NOTE 1—The constant C is to adjust the calculation for the difference
source to ascertain from its sheen if all mineral oil is removed in density of the solvent (water in water-based systems and a generic
solvent in solvent-based systems).
from the test panel. Repeat wiping, if necessary, u
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