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Model 700 Series -40C ________________________________________________________________________Appendix A
Contact of liquid nitrogen or cold gas with the skin or eyes may cause serious freezing (frostbite) injury.
Handle liquid nitrogen carefully.
The extremely low temperature can freeze human flesh very rapidly. When spilled on a surface the liquid tends to cover it com-
pletely and intimately, cooling a large area. The gas issuing from the liquid is also extremely cold. Delicate tissue, such as that of
the eyes, can be damaged by an exposure to the cold gas which would be too brief to affect the skin of the hands or face.
Never allow any unprotected part of your body to touch objects cooled by liquid nitrogen.
Such objects may stick fast to the skin and tear the flesh when you attempt to free yourself. Use tongs to withdraw objects
immersed in the liquid, and handle the object carefully.
Wear protective clothing.
Protect your eyes with a face shield or safety goggles (safety glasses without side shields do not give adequate protection).
Always wear gloves when handling anything that is, or may have been, in immediate contact with liquid nitrogen. Insulated gloves
are recommended, but heavy leather gloves may also be used. The gloves should fit loosely, so that they can be thrown off quickly
if liquid should splash into them. When handling liquid in open containers, it is advisable to wear high-top shoes. Trousers (which
should be cuffless if possible) should be worn outside the shoes.
Appendix A
Handling Liquid Nitrogen
A - 1
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