... coefficient<0.005% Exhahalation resistance<100pa Vision: Total field of vision>75%, Binocular field of vision>55 MF27 full-face respirator can ... lens which is made of polycarbonate have features: broad vision, good optical and strong impact resistance.e.The canister ... resistance≤100paVision: Total field of vision≥75%, Binocular field of vision≥55%, The below field of vision≥35(degree)Working time: ...