Standard Test Method for
Quantifying Dirt Collection on Coated Exterior Panels1
This standard is issued under the fixed designation D 3719; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the 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.
1.1 This test method covers an instrumental procedure for
quantifying the degree of dirt collection on exposed exterior
1.2 This test method is limited to those coated exterior
panels with lightness values before exposure significantly
greater than those after exposure.
1.3 The instrumental readings do not distinguish between
mildew growth and other forms of dirt.
1.4 This test method measures total dirt collection. Loose
dirt may be washed and removed from specimens if only
imbedded dirt collection is to be measured.
1.5 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. Referenced Documents
2.1 ASTM Standards:
D 823 Practices for Producing Films of Uniform Thickness
of Paint, Varnish, and Related Products on Test Panels2
D 2244 Test Method for Calculation of Color Differences
from Instrumentally Measured Color Coordinates2
D 3274 Test Method for Evaluating Degree of Surface
Disfigurement of Paint Films by Microbial (Fungal or
Algal) Growth or Soil and Dirt Accumulation2
3.1.1 dirt collection, n—the collection of foreign matter that
darkens the surface of exterior exposed coated panels.
4. Summary of Test Method
4.1 Lightness readings using a color difference meter are
made before and after exposure, and the difference is considered to be due to dirt collection.
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