1.Oil mist penetration coefficient:less than 0.005% at 30 L/min. 2.Inhalation resistance:less than 196 Pa at 30 L/min. 3 .Exhalation resistance:less than 100 Pa at 30 L/min. 4.Visual field : total no less than 75%,binocular visual field no less than 30%. 5.Weight:Weight of a complete set of the gas mask approx.840 grams. 6.Storage life:5 years