Recommendations for Chemical Protective Clothing A Companion to the NIOSH Pocket Guide to Chemical Hazards TABLE M

Chemical	CAS No.	Recommendation for skin protection†	Recommended protective clothing barriers*
Magnesite	546-93-0	N.R.	Determine based on working conditions
Magnesium oxide fume	1309-48-4	N.R.	Determine based on working conditions
Malathion	121-75-5	Prevent skin contact	4 hr: Teflon, PE/EVAL
Maleic anhydride	108-31-6	Prevent skin contact	8 hr: Responder
Malonaldehyde	542-78-9	Prevent skin contact	Contact the manufacturer for recommendations
Malononitrile	109-77-3	Prevent skin contact	Contact the manufacturer for recommendations
Manganese compounds and fume (as Mn)	7439-96-5 (metal)	N.R.	Determine based on working conditions
Manganese cyclopentadienyl tricarbonyl (as Mn)	12079-65-1	Prevent skin contact	Contact the manufacturer for recommendations
Manganese tetroxide (as Mn)	1317-35-7	N.R.	Determine based on working conditions
Marble	1317-65-3	N.R.	Determine based on working conditions
Mercury compounds [except (organo) alkyls] (as Hg)	7439-97-6 (metal)	Prevent skin contact	Contact the manufacturer for recommendations for the specific compound
Mercury (organo) alkyl compounds (as Hg)		Prevent skin contact	Contact the manufacturer for recommendations for the specific compound
Mesityl oxide	141-79-7	Prevent skin contact	8 hr: Responder
Methacrylic acid	79-41-4	Prevent skin contact	8 hr: Butyl, Viton, PE/EVAL, REsponder, Tychem
Methomyl	16752-77-5	Prevent skin contact	8 hr: Tychem
Methoxychlor	72-43-5	Prevent skin contact	Contact the manufacturer for recommendations
Methoxyflurane	76-38-0	N.R.	Determine based on working conditions
4-Methoxyphenol	150-76-5	Prevent skin contact	Contact the manufacturer for recommendations
Methyl acetate	79-20-9	Prevent skin contact	8 hr: PE/EVAL 4 hr: Teflon
Methyl acetylene	74-99-7	Frostbite	Prevent possible skin freezing from direct liquid contact
Methyl acetylene-propadiene mixture	59355-75-8	Frostbite	Prevent possible skin freezing from direct liquid contact
Methyl acrylate	96-33-3	Prevent skin contact	8 hr: Butyl, Tychem 4 hr: Teflon
Methylacrylonitrile	126-98-7	Prevent skin contact	Contact the manufacturer for recommendations
Methylal	109-87-5	Prevent skin contact	Contact the manufacturer for recommendations
Methyl alcohol	67-56-1	Prevent skin contact	8 hr: Butyl, Teflon, Viton, Saranex, PE/EVAL, Responder, Trellchem, Tychem
Methylamine	74-89-5	Prevent skin contact (solution)/ Frostbite	8 hr: Responder, Tychem 4 hr: Teflon Prevent possible skin freezing from direct liquid contact
Methyl (n-amyl) ketone	110-43-0	Prevent skin contact	4 hr: PE/EVAL
Methyl bromide	74-83-9	Prevent skin contact (liquid)	8 hr: Responder, Tychem 4 hr: Butyl, Neoprene, Teflon
Methyl Cellosolve®	109-86-4	Prevent skin contact	8 hr: Butyl, Tychem 4 hr: PE/EVAL
Methyl Cellosolve® acetate	110-49-6	Prevent skin contact	8 hr: Butyl, Tychem 4 hr: Saranex, PE/EVAL
Methyl chloride	74-87-3	Prevent skin contact/ Frostbite	8 hr: Viton, Saranex, Barricade, Responder, Trellchem, Tychem 4 hr: Teflon Prevent possible skin freezing from direct liquid contact
Methyl chloroform	71-55-6	Prevent skin contact	8 hr: PVA, Viton, PE/EVAL, Barricade, CPF3, Responder, Tychem 4 hr: Teflon
Methyl-2-cyanoacrylate	137-05-3	Prevent skin contact	Contact the manufacturer for recommendations
Methylcyclohexane	108-87-2	Prevent skin contact	Contact the manufacturer for recommendations
Methylcyclohexanol	25639-42-3	Prevent skin contact	Contact the manufacturer for recommendations
o-Methylcyclohexanone	583-60-8	Prevent skin contact	Contact the manufacturer for recommendations
Methyl cyclopentadienyl manganese tricarbonyl (as Mn)	12108-13-3	Prevent skin contact	Contact the manufacturer for recommendations
Methyl demeton	8022-00-2	Prevent skin contact	Contact the manufacturer for recommendations
4,4'-Methylenebis(2-chloroaniline)	101-14-4	Prevent skin contact	8 hr: Saranex, Barricade 4 hr: PE/EVAL
Methylene bis(4-cyclo- hexylisocyanate)	5124-30-1	Prevent skin contact	Contact the manufacturer for recommendations
Methylene bisphenyl isocyanate	101-68-8	Prevent skin contact	8 hr: PE/EVAL, Barricade, Responder
Methylene chloride	75-09-2	Prevent skin contact	8 hr: PVA, PE/EVAL, Responder, Trellchem, Tychem 4 hr: Teflon, Barricade
4,4'-Methylenedianiline	101-77-9	Prevent skin contact	8 hr: PE/EVAL
Methyl ethyl ketone peroxide	1338-23-4	Prevent skin contact	Contact the manufacturer for recommendations
Methyl formate	107-31-3	Prevent skin contact	Contact the manufacturer for recommendations
5-Methyl-3-heptanone	541-85-5	Prevent skin contact	Contact the manufacturer for recommendations
Methyl hydrazine	603-4-4	Prevent skin contact	8 hr: Responder, Tychem
Methyl iodide	74-88-4	Prevent skin contact	8 hr: Viton, Responder, Tychem
Methyl isoamyl ketone	110-12-3	Prevent skin contact	Contact the manufacturer for recommendations
Methyl isobutyl carbinol	108-11-2	Prevent skin contact	Contact the manufacturer for recommendations
Methyl isocyanate	624-83-9	Prevent skin contact	8 hr: PVA, Barricade, Responder, Trellchem, Tychem
Methyl isopropyl ketone	563-80-4	Prevent skin contact	Contact the manufacturer for recommendations
Methyl mercaptan	74-93-1	Prevent skin contact (liquid)/ Frostbite	8 hr: Barricade, Responder, Tychem Prevent possible skin freezing from direct liquid contact
Methyl methacrylate	80-62-6	Prevent skin contact	8 hr: PVA, PE/EVAL, Barricade, Trellchem 4 hr: Teflon
Methyl parathion	298-00-0	Prevent skin contact	Contact the manufacturer for recommendations
Methyl silicate	681-84-5	Prevent skin contact	Contact the manufacturer for recommendations
alpha-Methyl styrene	98-83-9	Prevent skin contact	Contact the manufacturer for recommendations
Metribuzin	21087-64-9	Prevent skin contact	Contact the manufacturer for recommendations
Mica (containing less than 1% quartz)	12001-26-2	N.R.	Determine based on working conditions
Mineral wool fiber		Prevent skin contact	Any barrier that will prevent contamination from the dust and fiber
Molybdenum	7439-98-7	N.R.	Determine based on working conditions
Molybdenum (soluble compounds, as Mo)		Prevent skin contact	Contact the manufacturer for recommendations for specific compounds
Monocrotophos	6923-22-4	Prevent skin contact	Contact the manufacturer for recommendations
Monomethyl aniline	100-61-8	Prevent skin contact	Contact the manufacturer for recommendations
Morpholine	110-91-8	Prevent skin contact	8 hr: Butyl, PE/EVAL

Recommendations for skin protection^†

Prevent skin contact....	Wear appropriate personal protective clothing to prevent skin contact. Suggested barriers for use should be confirmed with the vendor and for additional information and use limitations.
Frostbite....................	Wear appropriate personal protective clothing to prevent the skin from becoming frozen from contact with the evaporating liquid or from contact with vessels containing the liquid.
N.R...........................	No specific recommendation can be made. Actual working conditions will determine the need and type of personal protective equipment.

†Bold type indicates a change from or an addition to what is published in the NIOSH Pocket Guide to Chemical Hazards, June 1997 Edition.

Recommended protective clothing barriers^*

Butyl = Butyl Rubber (Gloves, Suits, Boots) Natural = Natural Rubber (Gloves) Neoprene = Neoprene Rubber (Gloves, Suits, Boots) Nitrile = Nitrile Rubber (Gloves, Suits, Boots) PE = Polyethylene (Gloves, Suits, Boots) PVA = Polyvinyl Alcohol (Gloves) PVC = Polyvinyl Chloride (Gloves, Suits, Boots) Teflon = Teflon™ (Gloves, Suits, Boots)

Viton = Viton™ (Gloves, Suits) Saranex = Saranex™ coated suits PE/EVAL = 4H™ and Silver Shield™ brand gloves Barricade = Barricade™ coated suits CPF3 = CPF3™ suits Responder = Responder™ suits Trellchem = Trellchem HPS™ suits Tychem = Tychem 10000™ suits

8 hr = More than 8 hours of resistance to breakthrough >0.1 µg/cm²/min.

4 hr = At least 4 but less than 8 hours of resistance to breakthrough >0.1 µg/cm²/min.

*Neoprene is a tradename and Teflon™, Barricade™ and Tychem 10000™ are trademarks of the DuPont Company. Viton™ is a registered trademark of DuPont Dow Elastomers. Saranex is a tradename of the Dow Chemical Company. 4H is a trademark of the Safety 4 Company. Silver Shield is a trademark of the Siebe North Company. CPF3 and Responder are trademarks of the Kappler Company. Trellchem HPS is a trademark of the Trelleborg Company. Recommendations are NOT valid for very thin Natural Rubber, Neoprene, Nitrile, and PVC gloves (0.3 mm or less).

This page was last updated April 12, 1999

Return to Index page