2.5.4
Chalking Resistance
After the 2000-hour weatherometer test, exterior coating shall not chalk
greater than No. 8 rating when measured in accordance with ASTM D 4214 test
procedures.
2.5.5
Abrasion Resistance Test for Color Coating
When subjected to the falling sand test in accordance with ASTM D 968,
coating system shall withstand a minimum of 100 liters of sand per 0.025 mm
mil of coating thickness before appearance of base metal.
2.5.6
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.
2.5.7
Fire Hazard
**************************************************************************
NOTE: Delete this paragraph if mill finish has been
selected. If roofing is exposed in exit areas, use
a flame spread of 25; if exposed in non-exit areas,
use flame spread of 75; otherwise delete the
paragraph.
**************************************************************************
The finish on factory-fabricated panels shall have a flame spread rating of
not more than [25] [75] when tested in accordance with ASTM E 84.
2.5.8
Gloss
The gloss of the finish shall be 30 plus or minus 5 at an angle of 60
degrees, when measured in accordance with ASTM D 523.
2.5.9
Glare Resistance
**************************************************************************
NOTE: The requirements for glare resistance should
be included only when specifically required by the
facility for critical glare areas such as control
towers or other structures where glare can be an
operational hazard.
**************************************************************************
Surfaces of panels that will be exposed to the exterior shall have a
specular reflectance of not more than 10 when measured in accordance with
ASTM D 523 at an angle of 85 degrees. Requirements specified under
"Formability Test" will be waived if necessary to conform to this
requirement.
2.6
LINER PANELS
Fabricate liner panels of the
same material as roof panels, and formed or
patterned to prevent waviness
and distortion. Liner panels shall have a
factory applied, 0.025 mm one
mil thick minimum painted coating on the
inside face, and a prime coat
on the liner side.
SECTION 07612N
Page 19
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