These Keep Away from Heat labels are used to alert personnel, content inside may be damaging from heat. The Keep Away From Heat symbols is recognized internationally, and conforms to air regulations. This label is required if you are transporting self-reacting materials including class 4.1 spontaneously combustibles and class 5.2 organic peroxides. This label meets the requirement under DOT CFR 49, ICAO / IATA and IMDG guidlines for shipments by air, land or sea. Labels measure 4" x 6" in., and made of pressure sensitive peel-off heavy weight coated paper with fade-resistant UV-inks for maximum durability. Use this label if you are shipping goods sensitive to heat.