GGG-H-211D
3.11.1.5 Flame propagation rate (plastic plates only). All plastic
materials used in the construction of style a, b or c plates shall be
noncombustible or slow burning when tested as specified in 4.2.4.9.
3.11.1.6 Thermal shock. Optical surfaces of type III plates shall not
delaminate or deteriorate or there shall be no fracture of glass when the
plates are tested for thermal shock as specified in 4.2.4.10.
3.11.1.7 Workmanship. The optical surfaces of the plates shall be free from
surface defects to within 9.5 mm of the edge. The optical surfaces shall be
flat and substantially parallel. The corners of the edges shall be ground suf-
ficiently to prevent injury to the user.
3.11.2 Style a plates.
3.11.2.1 Physical characteristics. Style a plates shall be made of single
sheet glass, plastic, laminated glass or other material, and shall measure 50.8
-- 0.8 mm wide, 108.0 ± 0.8 mm long, and between 2.0 mm and 3.8 mm thick.
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3.11.2.2 Radiant energy transmittance. Style a plates shall be of the shade
specified (see 6.2) and shall conform to the radiant energy transmittance
requirements shown in table I, when tested as specified in 4.2.4.11.
3*11.2.3 Impact resistance. Style a plates shall not fracture when tested
for impact resistance as specified in 4.2.4.12.
3.11.2.4 Maximum transparency. The maximum transparency of style a plates
shall be between 490 and 600 nanometers gradually decreasing on either side.
Plates conforming to this requirement shall have a dominant hue ranging from
bluish-green, yellowish-green to greenish-yellow, depending upon the compos-
ition of the filter, when tested as specified in 4.2.4.13.
3.11.2.5 Haze. Plastic of all types used in style a plates shall exhibit
not more than 6.0 percent haze when tested as specified in 4.2.4.14.
3.11.2.6 Distance from plate to eye. The distance from style a plates to
eye when the plates are mounted in helmets shall be not less than 50.8 mm. The
contractor shall certify that this requirement has been met.
3.11.3 Style b plates.
3.11.3.1 Physical characteristics. Style b plates shall be single, solid
glass plates either uncoated, plastic coated on one or both sides, or shall be
of allyl-plastic sheet, as specified (see 6.2). Allyl plastic sheets shall be
allyl cast plastic CR-39 (Columbia Resin 39) or equal. All style b plates
shall be the same peripheral size and shape as style a plates. The contractor
shall certify that these requirements have been met. Additionally, the thick-
ness of the coated or uncoated style b plates shall be not less than 1.2 mm nor
more than 3.8 mm.
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