nominal 1 mil thick [PVDF2][PVDF][_____] finish otherwise the same as the
exterior] [a backer coat with a dry film thickness of 0.5 mil] [a 0.2 mil
thick prime coat]. Finish coat color shall [be ______][be as selected by
Contracting Officer from manufacturer standard [and custom] color
charts][match the color indicated [on the drawings] [in Section 09915 COLOR
SCHEDULE]]. The exterior color finish shall meet the performance
requirements specified.
2.2.1
Salt Spray Test
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NOTE: The results of the salt spray test will vary
depending on the thickness of the coating.
Normally specify less than 3 mm (1/8 inch) creepage
from scripe for steel panels and 1.5 mm (1/16 inch)
creepage from scripe for aluminum panels.
For projects located in high temperature and regular
high humidity service conditions or other severely
corrosive environment, or where premium finish would
be justified, the following test requirement
selections should be made for steel panels and
appropriate coating type and thickness specified:
Rating of 10, no blisters in field
Rating of 7, 1.5 mm (1/16 inch) edge creep
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A sample of the sheets shall withstand a cyclic corrosion test for a
minimum of 2014 hours in accordance with ASTM D 5894, including the scribe
requirement in the test. Immediately upon removal of the panel from the
test, the coating shall receive a rating of not less than [8][10], [few
blisters][no blistering], as determined by ASTM D 714; no rusting, as
determined by ASTM D 610; and a rating of [6][7], less than [1.5 mm (1/16
inch)][3 mm (1/8 inch)] creepage from scribe as determined by ASTM D 1654.
2.2.2
Formability Test
When subjected to testing in accordance with ASTM D 522 Method B, 1/8 inch
diameter mandrel, the coating film shall show no evidence of fracturing to
the naked eye.
2.2.3
Accelerated Weathering, Chalking Resistance and Color Change
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NOTE: Low gloss finishes have relatively poor
weathering qualities. Delete the last sentence if a
low gloss finish is not required.
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Coating sample shall withstand weathering test of 5000 hours , in
accordance with ASTM D 4587 and ASTM G 154, Type D using without cracking,
peeling, blistering, loss of adhesion of the protective coating, or
corrosion of the base metal. Protective coating with an adhesion rating of
less than 4B when tested in accordance with ASTM D 3359, Test Method B,
shall be considered as an area indicating loss of adhesion. Following the
accelerated weathering test, the coating shall have a chalk rating not less
than No. 8 in accordance with ASTM D 4214 test procedures, and the color
SECTION 07413
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