change shall not exceed 5 CIE or Hunter Lab color difference (delta E)
units in accordance with ASTM D 2244. [For sheets required to have a low
gloss finish, the chalk rating shall be not less than No. 6 and the color
difference shall be not greater than 7 units.]
2.2.4
Humidity Test
When subjected to a humidity cabinet test in accordance with ASTM D 2247
for 1000 hours, a scored panel shall show no signs of blistering, cracking,
creepage or corrosion.
2.2.5
Impact Resistance
Factory-painted sheet shall withstand direct and reverse impact in
accordance with ASTM D 2794 13 mm (0.50 inch) diameter hemispherical head
indenter, equal to 1.5 times the metal thickness in mils, expressed in
inch-pounds, with no loss of adhesion.
2.2.6
Abrasion Resistance Test
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NOTE: The 70 percent polyvinylidene fluoride (PVDF2)
finish has a minimum abrasion resistance of about 65
liters per 0.025 mm (65 liters/mil) of coating
thickness. A 0.030 mm (1.2 mil) PVDF2 coating will
resist 80 liters of sand and a 0.035 mm (1.4 mil)
PVDF2 coating will resist approximately 100 liters
of sand. Note that the results of this test are
variable and offer poor repeatability. Where
greater than 65 liters of sand abrasion resistance
is specified, coordinate with coating type specified.
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When subjected to the falling sand test in accordance with ASTM D 968,
Method A, the coating system shall withstand a minimum of [50] [80] [100]
liters of sand before the appearance of the base metal. The term
"appearance of base metal" refers to the metallic coating on steel or the
aluminum base metal.
2.3
ACCESSORIES
Flashing, trim, metal closure strips, caps, and similar metal accessories
shall be the manufacturer's standard products. Exposed metal accessories
shall be finished to match the panels furnished. Molded closure strips
shall be bituminous-saturated fiber, closed-cell or solid-cell synthetic
rubber or neoprene, or polyvinyl chlorided premolded to match configuration
of the panels and shall not absorb or retain water.
2.4
FASTENERS
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NOTE: Fasteners that are not color coated may be
limited to 300-series corrosion resisting steel when
justified by atmospheric exposure conditions.
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Fasteners for steel panels shall be zinc-coated steel, aluminum, corrosion
resisting steel, or nylon capped steel, type and size specified below or as
otherwise approved for the applicable requirements. Fasteners for aluminum
SECTION 07413
Page 15
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