876 | A B E K WEL: Workplace Exposure Limit Maximum contaminant concentration to which the user may be exposed without adverse health effects. TIL: Total Inward Leakage Combined leakage of the ambient atmosphere into the face piece via the filter media, valve and face seal. NPF: Nominal Protection Factor Nominal level of protection given by respiratory PPE (in laboratory conditions). APF: Assigned Protection Factor Level of protection that can realistically be expected under real workplace conditions. DOLOMITE TEST (D): Clogging test under EN149 using dolomite dust. Respirators which pass the dolomite test are proven to provide a more comfortable breathing level and longer lasting filtration performance. Such respirators are marked with the letter “D”. Dolomite testing is optional for single use “NR” respirators and mandatory for reusable “R” respirators. EN STANDARDS: RESPIRATORY PROTECTIVE DEVICES EN149:2001+A1:2009 RESPIRATORY PROTECTIVE DEVICES – FILTERING HALF MASKS TO PROTECT AGAINST PARTICLES. This European Standard covers particle filtering half masks i.e., disposable dust masks. With the A1:2009 amendment, these are now classified as either not reusable (NR) beyond a single working shift, or reusable for more than 1 shift (R). TERMINOLOGY Disposable Mask Selection FFP3 FFP2 FFP1 Minimum Filtration % 99% 94% 80% Total Inward Leakage (TIL) 2% 8% 22% Nominal Protection Factor (NPF) 50 x WEL 12 x WEL 4 x WEL Assigned Protection Factor (APF) 20 x WEL 10 x WEL 4 x WEL Gas and Vapours Filters Type Colour Code Main Gas Filter Types: A - Organic gases and vapours with a boiling point >65°C B - Inorganic gases and vapours E - Sulphur dioxide and other acid gases and vapours K - Ammonia and organic ammonia derivatives Class 1: Low capacity, up to 1000ppm Class 2: Medium capacity, up to 5000ppm Class 3: High capacity, up to 10,000ppm EN143:2007: Particulate Filters PARTICULATE FILTER CLASSES: P1 - Low filter performance (80% efficiency) P2 - Medium filter performance (94% efficiency) P3 - High filter performance (99.95% efficiency) EN148-1: Standard Threads for Facepieces EN405:2001+A1:2009 Valved Filtering Half Mask with Fixed Gas Filters and/or Particulates Filters MAIN GAS FILTER TYPES: EN136:1998 Full Face Mask Facepieces Class 1: Light Duty Class 2: General Use Class 3: Special Use (Heavy Duty/Firefighters) EN140:1998 Half Mask Facepieces EN14387:2008 Gas Filters and Combination Filters
RkJQdWJsaXNoZXIy MTkwMjk0