Chemical Respiratory Guide

Chemical Agent

CAS Number

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Chemical Name	CAS Number	Filter Type	Suggested Product	TLV(t) PEL(o)	IDLH	Comments
2,4,6-Trinitrotoluene	118-96-7	OV/N	7100+8910 8100+8910	0.1 mg/m3(t); 1.5 mg/m3 (o) -skin-	500 mg/m3	Substance for which an ACGIH BEI (Methemoglobin inducer) exists
2,4-D	94-75-7	OV/NRP100	7100+7940 8100+8940	10 mg/m3 (o)(t)	100 mg/m3	t-A4
2-Butoxy Ethyl Acetate	112-07-2	OV	7100 8100	20 ppm (t)	2,000 ppm [10% Lower explosion limit]	t-A3
2-Ethoxy Ethylacetate	111-15-9	OV	7100 8100	100 ppm (o); 5 ppm (t); -skin-	500 ppm	Substances for which ACGIHBEI exists
2-Ethoxyethanol	110-80-5	OV	7100 8100	5 ppm (t); 100 ppm (o); -skin-	500 ppm	Substances for which ACGIHBEI exists
2-Hexanone	591-78-6	OV	7100 8100	5 ppm (t);100 ppm (o); 10 ppm (s)-(t); -skin-	1,600 ppm
2-Methoxyethanol	109-86-4	OV	7100 8100	0.1 ppm (t); 25 ppm (o); -skin-	200 ppm	Substance for which ACGIH BEI exists
2-Methoxyethyl Acetate	110-49-6	OV	7100 8100	0.1 ppm (t); 25 ppm (o); -skin-	200 ppm	Substance for which ACGIH BEI exists
2-Methylcyclopentadienyl Manganese Tricarbonyl	12108-13-3	OV/N	7100+8910 8100+8910	0.2 mg/m3 (t); -skin-		If heat involved, use
2-Nitropropane	79-46-9	OV	7100 8100	10 ppm (t) 25 ppm (o)	100ppm

EXPLANATION OF GUIDE FORMAT

"N" means Dusts and Non-Oil Based Mists
"R" means Dusts, and Oil and Non-Oil Based Mists with time restrictions
"P" means Dusts and Oil and Non-Oil Based Mists, extended life for Dusts and Non-Oil Based Mists
"AM" means Ammonia/Methylamine
"AG" means Acid Gas
"FORM" means Formaldehyde
"OV" means Organic Vapor
"OV/AG" means Organic Vapor/Acid Gas
"MULTI" means Multi Gas/Vapor
"95" means 95% efficient
"99" means 99% efficient
"100" means 99.97% efficient
"/" means OR. For example, 8970/8940 means you may use either filter.
"FF" means full face respirator; 9000 is sugg

An "o" next to exposure limit indicates it is an OSHA PEL.
A "t" indicates it is an ACGIH TLV.
A"c"indicates that it is a ceiling valuewhich refers to the concentrationthat should not be exceeded at anytime during work exposure.
An"s" appears next to a limit this indicates that it is a short termexposure limit (STEL
A "skin" designation indicates that the substance can be absorbed throughthe skin, eyes or mucous membranes and appropriate measures must betaken to avoid absorption.
A "SEN" indicates TLV-confirmed potential for worker sensitization as a resultof dermal contact and/or inhalation exposure based on the weightof scientific evidence.

Comments list any additional points that should be noted.
ACGIH designates carcinogens as follows: