The Next Generation of Tactical Gas Masks for Personal Defense
The Mestel SGE 400/3 BB Tactical Gas Mask provides unparalleled protection against chemical, biological, radiological, and nuclear (CBRN) threats.
Originally developed for military, law enforcement, and civil defense applications, the SGE 400/3 BB is now commercially available for use in personal defense. Its game-changing introduction has created a whole new generation of “advanced” breathing protection devices the world over.
Heavy-Duty One Piece Visor Face Shield
The SGE 400/3 BB is constructed using a highly-durable polycarbonate visor face shield that protects not only the eyes, but the entire face as well. This innovative design feature guarantees an unsurpassed level of cut resistance and impact protection for the face while very comfortably supporting the head harness, valves, filters, regulators and optional equipment upgrades.
A polysiloxane resin coating protects the polycarbonate visor face shield itself from the potentially harmful effects of aggressive substances.
The specially-treated polycarbonate material is easy to clean and decontaminate an unlimited number of times. No deterioration has been observed using all normal decontamination methods, including immersion into boiling water.
CBRN-Rated Integral Face Seal
Traditional gas masks consist of a flimsy rubber body fitted with two sealed eye pieces. Since the rubber body must support the weight of any accessories attached to the mask, it must be made rigid and thick (i.e., heavy and uncomfortable). The tensile stress exerted by the ends of the straps is discharged only onto the points where they join the mask body. It is therefore necessary to pull the straps very tightly in order to secure a uniform seal around the edge of the mask. This cumbersome design causes unnecessary discomfort to the wearer’s face.
The SGE 400/3 BB face seal is made of very soft rubber with a supple, bellows-type structure. This unique shape allows for a perfect seal every time without sacrificing comfort. The face seal has a seat into which the edge of the load-bearing face piece is inserted, and the coupling of these two parts is ensured by the fixing rim.
As a whole, the universal fit adjustable head harness, integral face seal and stiff polycarbonate body of the mask together provide far more comfort than traditional masks could ever offer. The SGE 400/3 BB may be worn comfortably for up to five continuous days.
Extremely Durable Filter Port Fittings
The SGE masks have a threaded fitting for application of standard filters (DIN 3183, UNI EN 148-1). The fitting is contained in a single unit which also comprises the exhalation valve. The shape of the internal ring nut allows perfect ventilation of the whole face-piece, preventing misting even at low temperatures.
The material used is black polyarilamide, which was originally created for aeronautical and aerospace requirements.
In addition to very high impact resistance, it is not affected by aging or atmospheric factors. Its abrasion resistance is such that after testing with over 3000 assembly/disassembly operations, the filter had sustained no wear.
Technopolymer components include polyarilamide reinforced with mineral charges. Membrane composed of a polyisoprene mixture.
Integrated Exhalation Valve Components
As already seen, the exhalation valve is fitted onto the same unit containing the filter fitting. Externally the valve has a structure which, although it covers the whole membrane, still allows easy discharging of the exhaled air. The purpose of this covering structure is to keep a sufficient volume of uncontaminated air in continuous contact with the membrane.
The exhalation membrane has been made to require minimum effort even at very high flow rates. The excellent memory of the membranes has been achieved by a combination of innovative design and high grade material. A considerable increase in resistance to chemical agents, has been achieved, using blends containing butyl rubbers instead of the traditional natural rubber used by other manufacturers.