MF29 model gas mask: 1. Raw material: natural rubber; 2. Comfortab ... should be discharged, charging protection. 4.2 The protective masks are toxic, harmful to the environment using the product, ... in use. 4.4 into the gas masks should be worn before a good area. Masks in use, when feeling unwell, ... . 4.7 The product does not apply to toxic gas operations, chemical and biological warfare, the fire escape. ...