The treated face-piece may also be decontaminated an unlimited number of times without deterioration, using all the normal decontamination methods including immersion in boiling water. After over 50 hours, mustard gas failed to penetrate through the tested specimens. Samples of the treated material have been subjected to mustard gas penetration tests. Treatment of the outer surfaces (SGE 400 SGE 400/3 SGE 400/3 BB only) makes the polycarbonate resistant to aggressive substances. This means that the whole face is given the same protection afforded by the protective helmet. Laboratory tests have been carried out proving that the polycarbonate body is left unharmed by a 6.35 caliber bullet hitting it at a speed of more than 150 m/seconds. General features In the SGE masks, the entire body of the masks is made of a strong, rigid material (polycarbonate) and is therefore able to allow full protection for the face and eyes against extremely violent impacts. The material used is a specially coated polycarbonate (SGE 400 SGE 400/3 SGE 400/3 BB only), which transmits at least 90% of available light while absorbing U.V. The main part of the face-piece, which consists of a large round surface in front of the eyes, is set back in the structure, thus keeping the overall dimensions to a minimum, reducing the risk of scratching and allowing the use of optical instruments so often used in today’s armed forces. This unit supports the head harness, valves, filters, regulators, etc. Its task is to replace the rubber bodies previously employed by traditional designs to bear the weight to which the mask is subjected. This stiff, transparent structure is the actual supporting body of the SGE 400 protective masks.
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