H

TABLE H

Chemical	CAS No.	Recommendation for skin protection†	Recommended protective clothing barriers*
Hafnium	7440-58-6	Prevent skin contact	Contact the manufacturer for recommendations
Halothane	151-67-7	Prevent skin contact	8 hr: PVA
Heptachlor	76-44-8	Prevent skin contact	Contact the manufacturer for recommendations
n-Heptane	142-82-5	Prevent skin contact	8 hr: Nitrile, Viton, PE/EVAL
1-Heptanethiol	1639-09-4	Prevent skin contact	Contact the manufacturer for recommendations
Hexachlorobutadiene	87-68-3	Prevent skin contact	8 hr: Responder, Tychem
Hexachlorocyclopentadiene	77-47-4	Prevent skin contact	8 hr: Butyl, Nitrile, PVA, Viton, Responder
Hexachloroethane	67-72-1	Prevent skin contact	Contact the manufacturer for recommendations
Hexachloronaphthalene	1335-87-1	Prevent skin contact	Contact the manufacturer for recommendations
1-Hexadecanethiol	2917-26-2	Prevent skin contact	Contact the manufacturer for recommendations
Hexafluoroacetone	684-16-2	Prevent skin contact/ Frostbite	Contact the manufacturer for recommendations
Hexamethylene diisocyanate	822-06-0	Prevent skin contact	8 hr: Saranex, Barricade, Responder
Hexamethyl phosphoramide	680-31-9	Prevent skin contact	Contact the manufacturer for recommendations
n-Hexane	110-54-3	Prevent skin contact	8 hr: Nitrile, PVA, Teflon, Viton, PE/EVAL, CPF3, Responder, Trellchem, Tychem 4 hr: Barricade
Hexane isomers (excluding n-Hexane)		Prevent skin contact	Contact the manufacturer for recommendations
n-Hexanethiol	111-31-9	Prevent skin contact	Contact the manufacturer for recommendations
2-Hexanone	591-78-6	Prevent skin contact	Contact the manufacturer for recommendations
Hexone	108-10-1	Prevent skin contact	Contact the manufacturer for recommendations
sec-Hexyl acetate	108-84-9	Prevent skin contact	Contact the manufacturer for recommendations
Hexylene glycol	107-41-5	Prevent skin contact	Contact the manufacturer for recommendations
Hydrazine	302-01-2	Prevent skin contact	8 hr: Butyl, Neoprene, Nitrile, PVC, Teflon, Saranex, Barricade, Responder 4 hr: PE/EVAL
Hydrogenated terphenyls	61788-32-7	Prevent skin contact	Contact the manufacturer for recommendations
Hydrogen bromide	10035-10-6	Prevent skin contact (solution)/ Frostbite	4 hr: Teflon Prevent possible skin freezing from direct liquid contact
Hydrogen chloride	7647-01-0	Prevent skin contact (solution)/ Frostbite	8hr: Butyl, Teflon, Saranex, Barricade, Responder, Trellchem, Tychem 4 hr: Neoprene, PVC Prevent possible skin freezing from direct liquid contact
Hydrogen cyanide	74-90-8	Prevent skin contact	8 hr: Teflon 4 hr: PE/EVAL, Responder, Tychem
Hydrogen fluoride (as F)	7664-39-3	Prevent skin contact (liquid)	8 hr: Tychem 4 hr: Teflon
Hydrogen peroxide	7722-84-1	Prevent skin contact	(solution 30%-70%) 8 hr: Butyl, Natural, Nitrile, PE, Viton, CPF3, Responder, Tychem 4 hr: PVC, PE/EVAL
Hydrogen selenide	7783-07-5	Frostbite	Prevent possible skin freezing from direct liquid contact
Hydrogen sulfide	7783-06-4	Prevent skin contact/ Frostbite	8 hr: Tychem 4 hr: Teflon Prevent possible skin freezing from direct liquid contact
Hydroquinone	123-31-9	Prevent skin contact	4 hr: Natural, Neoprene, Nitrile, PVC, PE/EVAL
2-Hydroxypropyl acrylate	999-61-1	Prevent skin contact	Contact the manufacturer for recommendations

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