§ 39.575. Windows of masks.
(a) The windows of masks, if separate for the two eyes, shall be not less than 40 mm. (1.57 inches) in diameter and if combined into a single window, they shall be at least 10.8 by 5.1 mm. (4.25 by 2 inches).
(b) Windows shall be securely held and be easily removable. Transparent cover pieces shall be designed to protect these windows, and windows of masks shall be tested by being held in their regular mountings and cooled in water at a temperature of 20°C (68°F) for 15 seconds, then plunged into boiling water 100°C (212°F). The lenses shall withstand this test without cracking.
(c) Windows of shields shall not be less than 10.8 mm. (4.25 inches) in the horizontal direction and not less than 5.1 cm. (100 inches) in the vertical direction, and these windows shall be composed of approved glass or plastic for protection against radiant energy. Transparent cover pieces shall be provided to protect these windows and they shall be reasonably free from flaws and of uniform thickness.
(d) The windows of hoods shall be of clear transparent glass or plastic. This material shall be protected on the outer surface by means of wire gauze of not larger than No. 60 mesh.
(e) Lenses or windows shall be replaced whenever they become scratched, discolored or crazed sufficiently to make them unfit for optical use.
Cross References This section cited in 34 Pa. Code § 39.579 (relating to masks); 34 Pa. Code § 39.581 (relating to shields); and 34 Pa. Code § 39.582 (relating to hoods).
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