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TABLE 2 <br /> Table of Respiratory Protection Equipment Protection Factors <br /> Type of Air Purifying Respirator Protection Factor <br /> Half-face APR 10 <br /> Full-face APR 100 <br /> When employed for protection from 50 <br /> benzene. See Note 1. <br /> When employed for protection from 25 <br /> vinyl chloride using vinyl chloride rated <br /> specific canister with a 4 hour service <br /> life. See Notes 2 and 3. <br /> Pressure-Demand SCBA or supplied air-line 10,000 <br /> respirators <br /> NOTE 1 : See the Benzene Standard, 29 CFR 1910.1028. <br /> NOTE 2: See the Vinyl Chlorine Standard, 29 CFR 1910.1017. <br /> NOTE 3: Because respirator cartridges/canisters meeting the service life requirements <br /> listed in 29 CFR 1910.1017 (g) are not normally available, work involving <br /> vinyl chloride concentrations above the action level of 0.5 ppm will require <br /> use of pressure-demand SCBAs. <br /> 1:24 <br />