Particulate respirators FFP2D are approved for use against solid and liquid aerosols according to UNE EN 149:2001. They are suitable for protection against low-to-average toxicity harmful materials in concentrations up to 12xOEL or 10xAPF. OEL: Occupational exposure limit. APF: Assigned protection factor. (D) Optional dolomite clogging test for more comfortable breathing.