Question

Complete the table using the ACGIH TLV-TWAs and the assigned protection factors for each type of respirator indicated

Chemical	TLV	Type of Respirator	Assigned Protection Factor	MUC
Acetone		Half-Face APR (Half Mask)
2-Butoxyethanol		Half-Face APR (Half Mask)
Toluene		Full Facepiece APR
Calcium Oxide		Loose-fitting PAPR
Gasoline		Full Facepiece APR
Methyl Ethyl Ketone		SCBA Pressure-Demand Mode Full Facepiece
Stoddard Solvent		Supplied-Air Pressure-Demand Full Facepiece

Answer 1

Chemical	TLV	Type of Respirator	Assigned Protection Factor	MUC
Acetone	500 ppm	Half-Face APR (Half Mask)	10	5000 ppm
2-Butoxyethanol	25 ppm	Half-Face APR (Half Mask)	10	250 ppm
Toluene	50 ppm	Full Face piece APR	50	2500 ppm
Calcium Oxide	5 mg/m3	Loose-fitting PAPR	25	125 mg/m3
Gasoline	300 ppm	Full Face piece APR	50	15,000 ppm
Methyl Ethyl Ketone	200 ppm	SCBA Pressure-Demand Mode Full Face piece	10,000	2x106 ppm
Stoddard Solvent	100 ppm	Supplied-Air Pressure-Demand Full Face piece	1,000	100,000 ppm

TLV means Threshold Limit Value: An occupational exposure level recommended by ACGIH MUC means Maximum Use Concentration: The maximum atmospheric concentration of a hazardous substance from which an employee can be expected to be protected when wearing a respirator, and is determined by the assigned protection factor of the respirator or class of respirators and the exposure limit of the hazardous substance. The MUC can be determined mathematically by multiplying the assigned protection factor specified for a respirator by the required OSHA permissible exposure limit, shortterm exposure limit, or ceiling limit. When no OSHA exposure limit is available for a hazardous substance, an employer must determine an MUC on the basis of relevant available information and informed professional judgment.