Chemicals kept at workstations are clearly labeled; chemical labels in a language workers understand; areas where chemicals are used are posted with safety and warning signs.Acetylene tanks are stored safely (away from flammable chemicals, sources of heat).Liquid propane tanks are stored safely (outdoors, posted with warning including no-smoking signs, away from exits).Explosion-proof lights and switches are installed in chemical storage or warehouses containing flammable materials (enclosed in rubberized, air-tight housing).