34 Laboratory Safety Manual Environmental Health and Safety • Store flammable liquids in UL-listed safety cans if the container quantity exceeds four liters (~ 1 gallon). • Store flammable liquids in a flammable storage cabinet. This is required when total quantity in a laboratory exceeds 40 liters (~10 gallons). • Store flammable liquids requiring cool/cold storage in refrigerators/freezers manufactured for that purpose. Modification of general-purpose (domestic) refrigerators or freezers for flammable liquid storage is NOT permitted. • Use flammable liquids in a fume hood, when possible to prevent buildup of ignitable vapor/air mixtures. Additional Resources • Fire Safety • Fire Safety Guidelines • Fire Safety Policy Lasers Class 3B and 4 lasers emit amplified visible and non-visible light radiation that may cause immediate harm to eyes and skin. All users of Class 3B and 4 lasers must be pre-approved by the Laser Safety Officer and must adhere to the safety requirements outlined in the Laser Safety Manual. Refer to Laser Safety on the EH&S website for more information. • Ensure that only properly trained personnel operate Class 3B and 4 lasers. • Maintain safety interlocks and laser enclosures. • Wear appropriately rated protective eyewear and clothing for the specific laser used. Mercury Small amounts of mercury are toxic and create significant problems if spilled. To minimize the risk of spills, equipment containing mercury must be in secondary containment. The use of mercury substitutes is highly encouraged, such as alcohol or electronic thermometers. Clean up of small mercury spills (thermometer size) is the responsibility of the user. All spills on porous surfaces such as carpet, and all large spills should be referred to EH&S. Mercury spill kits are available through CYBuy. Refer to Mercury Spills on the EH&S website for more information.