§ 39.574. Lense standards.
(a) Approved-type goggles, hoods, shields, helmets and masks utilizing plastic lenses or windows may be used.
(b) Approval may be granted for each device for specific operations or processes only. For example, a goggle may be approved as a type 3 goggle for groups 1, 2 and 3 operations or processess, as defined in this subchapter). The basis of this approval shall be results of tests such as a drop test, needle penetration test, high velocity impact test, resistance to scratching and heat hazards, chemical tests and optical tests as may be specified by the Department. All tests shall be performed by a recognized testing laboratory.
(c) Goggles, the lenses of which provide the proper optical correction, shall be of sufficient strength to withstand the drop test. Optical corrective lenses shall be made under the direction of the manufacturer of the goggles.
(d) Lenses on helmet windows shall transmit not more than 1.0% radiant energy of any wave length less than 365 millimicrons and not more than 50% of the total radiant energy incident upon them from a 200-watt, gas-filled, tungsten filament, electric incandescent lamp operating as commercially rated (approximately 0.8 watt per spherical candle). Transparent cover pieces shall be provided to protect the lenses and shall be reasonably free from flaws and of uniform thickness.
(e) Lenses or helmet windows shall transmit not more than 1.0% of radiant energy of any wave length less than 405 millimicrons and not more than 1.0% of the visible light and not more than 30% of the total radiant energy incident upon them from a 200-watt, gas-filled, tungsten filament, electric incandescent lamp, operating as commercially rated (approximately 0.8 watt per spherical candle). Transparent cover pieces shall be provided to protect the lenses and shall be reasonably free from flaws and of uniform thickness.
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