... Applications: working place of High concentration coal dust,High concentrations silica dust and other non-toxic dusts.can effectively ... Organic steam,ether,benzene,gas,acetone,carbon disulfide RC101 DUST FILTER Use with NP303, NP304 respirators ONLY ROYALROAD ... respirator TEC Index: Protect dust efficiency(%)≥95Inhale resistance (pa)≤49Breath resistance (pa)≤29. ...