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Performance Evaluation of DM and DFM Filter Respirators—WORKING DRAFT 9.15.92
Table A—OSHA's 1976 Assigned Protection Factors for Particulate-Filter Respirators
| Concentrations in multiples of permissible exposure limits |
Facepiece Pressure |
Permissible Respirators |
| 5X | - | Single use dust |
| - | Quarter-mask dust | |
| 10X | - | Half mask dust |
| - | Half- or quarter mask, fume | |
| - | Half- or quarter mask, high-efficiency | |
| 50X | - | Full facepiece, high efficiency |
| 1,000X | - | Powered, high-efficiency, all enclosures |
Note: Half-mask and quarter-mask respirators should not be used if the particulate matter causes eye irritation at the use concentration.
