Cryogenic Safety & Warning Labels Plastic labels for storage in liquid nitrogen, freezers, dry ice and other harsh environments. Resistant to multiple freeze-thaw cycles, boiling water, UV rays, sterilization by gamma irradiation, deep-freeze and harsh lab environments. The pictograms in laminated labels are protected against water, alcohol, chemicals and solvents. Water resistant, wear and tear-proof. Part numbers: 29503-XX General Use Safety & Warning Labels Standard warning labels for use at ambient temperatures. Part numbers: 29504-XX