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3M 4255 FFA2P3D Re-Usable 4000 Series Half Mask Respirators. This mask gives a higher level FFA2P3D protection against fine dusts, oil, water based mists and organic vapours. Bonded carbon allows the gas/vapour filter to be moulded around the face to improve vision and balance. Textured face seal to provide a more comfortable fit. Parabolic exhalation valve gives easier breathing and reduces heat build up. Approved to EN 405: 2002 FFA2P3D. Assigned protection factor for Gases & Vapours: 10 or 5000ppm which ever is the lower. Assigned protection factor for Particulates: 20.