1. MISC. CLASSES OF CHEMICALS Compressed Gases Cryogens

2. 1.COMPRESSED GASES a. Properties Material or mixture having a pressure exceeding 40 psi at 70 0 F. Variety of examples Proper labeling / inspection of tanks

3. b. Most Common Hazards High pressure – commonly 2000 psi or 136 atm. Minor leaks create hazard Major rupture creates hazard

4. c. Proper Storage of Tanks Properly secured Properly segregated Mark empty tanks No storage in extreme temp. areas

5. d. Proper Use of Tanks Proper procedure for moving tanks Upright position Hand-cart and chains Always screw cap on tank Proper regulator / check for leaks **Proper use of regulator – see diagram

7. 2. CRYOGENS a. Definition - liquified gases having a boiling point colder than –73 0 C. Liquid Nitrogen -196 0 C (-320 0 F) Liquid Helium - 269 0 C (-452 0 F) b. Proper Handling Protective wear Dewar Flasks (containers)

8. c. Common Hazards High Expansion Rate of Vaporization Ability to liquify other gases Tissue Damage