Keep flammables in use in the laboratory in original containers or safety cans specifically designed for that purpose at all times. In the event that such cans are not available, glass bottles may be used with the proper precaution. You must follow maximum allowable container size. Check out the NFPA CHART BELOW! Minimize the amount of flammable chemicals used and stored in the lab. The containers used by the manufacturer must meet certain standards for shipping. These same containers are not always suitable for routine use. The shipping container must be sealable and of suitable shape and strength for transport. This transport is usually within another container, carton, crate, etc. Contact REHS to learn more about shipping hazardous materials. Do not use screw caps to close bottles containing volatiles (such as diethyl ether, low-boiling petroleum ether, methylene chloride, and pentane) as pressure build up can cause failure in a bottle which is not new and which may have internal strains which come from normal use. In such situations, use corks or neoprene stoppers. Use a one-holed cork fitted with a drying tube if moisture must be excluded. To relieve pressure build up, use a cork fitted with a check valve. Keep all flammables away from direct sunlight and sources of heat.

Class I = Liquids with flash point <100 Deg. F
Class II = Liquids with flash point >100 Deg. F and <140 Deg. F
Class IIIA = Liquids with flash point >140 Deg. F and <200 Deg. F
Class IIIB = Liquids with flash point >200 Deg. F.

NOTE: Based on labs >200 ft2. For labs <200 ft2, use half the quantities given above. Larger quantities may be allowed with REHS approval.