GGGH-211D
3.2 Shell material.
3.2.1 Characteristics. All shell material in helmets and handshields shall
be thermally insulating, noncombustible or slow burning, and opaqued to ultra-
violet, infrared, and visible light radiations. The contractor shall certify
that these requirements have been met.
3.2.2 Dimensions. The shell material shall be made of vulcanized fiber not
less than 1.2 millimeter (mm) thick, or reinforced plastic or other material
not less than 1.0 mm thick.
3.2.3 Burn rate. The shell material shall not burn at a rate greater than
75 mm per minute when tested as specified in 4.2.4.1.
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3.3 Contour and dimensions. The body of the helmets and handshield shall
conform to the contour and dimensions shown on figures 1, 2, 3 and 4. Provided
these requirements are met, the actual appearance of the body of the helmets
and handshield may vary from that shown in the figures.
3.4 Weight. Helmets and handshields, exclusive of plates, shall not weigh
more than the following:
680 grams (g)
Type I, class 1, or type II
Type I, class 2
793 g
3.5 Light leakage. The helmets and handshields shall be so constructed that
they will be free from light leakage when tested as specified in 4.2.4.2.
3.6 Electrical insulation. Any metal parts, including rivets, which extend
through the shell of the helmet or handshield and which might touch the
wearer's head or face, shall not be exposed on the inside of the helmet or hand-
shield. Such metal parts shall be insulated by a covering of nonconductive
insulating material, other than lacquer or varnish, which completely insulates
and covers such metal parts. The insulation shall be sufficient to withstand
the insulation test specified in 4.2.4.3.
3.7 Finish. All interior and exterior parts shall have a permanent, non-
reflecting finish and shall be smooth and free from sharp edges or any irreg-
ularities which might present a hazard to the wearer or user.
3.8 Identification marking. Helmets, handshields, and style a and style c
plates shall bear a permanent distinctive marking identifying the manufacturer.
style a plates shall be marked with the shade number (see 3.11.2.2). Heat-
treated style c plates shall be marked with the letter "H."
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