Dust face mask conforms to international standarrds: EN149: 2001 FFP1 FFP2 FFP3 CE0194 NIOSH N95 Low breathing resistance with high filtration efficency. Loaded polypropylene material without any toxic, irritating, stimulant, poison. Adjustable nosepiece and inner foam proivide a custom seal for different facial sizes. Easy-breathing exhalation valve with silicon piece inside designed to facilitate air exchange, increase worker comfort. Specially designed to fit large facial contours and with flower-shape edge. Special 3-ply pleated design, hign filtration and static electricity material to resist normal toxic and ting micron particle. Suited to mining, building, grinding drugs, casting, agriculture, farming, electronic, food processing, cement textile, disintegration, carving, heavy metal pollution, gardening, glass etc workshops.