Assigned Protection Factor
Maximum Use Concentration (MUC) means the maximum atmospheric concentration of a hazardous substance from which an employee can be expected to be protected when wearing a respirator.
DO NOT apply MUCs to conditions that are immediately dangerous to life or health (IDLH)
It is determined by the assigned protection factor of the respirator or class of respirators and the exposure limit of the hazardous substance.
- Be sure to select respirators for employees that maintain their exposure to the hazardous substance at or below the MUC.
- DO NOT apply MUCs to conditions that are immediately dangerous to life or health (IDLH); instead, they must use respirators listed for IDLH conditions discussed later in the course.
- When the MUC exceeds the IDLH level for a hazardous substance or the performance limits of the cartridge or canister, then set the maximum MUC at that lower limit.
For more information see OSHA Publication 3352, Assigned Protection Factors for the Revised Respiratory Protection Standard.
Knowledge Check Choose the best answer for the question.
1-7. The maximum atmospheric concentration of a hazardous substance from which an employee can be expected to be protected when wearing a respirator is called the _____.
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