* Sold in a box of 100 pieces
Features:
Approved by the National Institute for Occupational Safety and Health (NIOSH, US) for use in environments containing certain non oil-based particles
To be used on top of 3M gas and vapour cartidges with 3M 501 Retainer when particles are also present; to be. used on top of 3M 603 Filter Holder and 3M 501 Retainer to minimise particulate exposure which may otherwise pose risks to human health
Particulate filter is replaceable 
When properly fitted and used together with appropriate cartridges in various applications such as spray painting, manufacture of pertrochemicals and chemicals, etc, it is able to be used in concentrations of up to 10 times the Permissible Exposure Limit (PEL) with half facepieces, and up to 50 times PEL with quantitatively fit tested full facepieces