Safety Sign. Public Health and Cancer Hazard signs are designed to identify and alert people to exposure to materials that may be hazardous to their health. Manufactured with 50% Post-Consumer Recycled plastic and is recyclable - code 2. Polyethylene plastic with matte surface. Impact resistant with slight flexibility. Rounded corners and 3/16 inch mounting holes on most sizes, will be adjusted for larger sizes. Service temperature range: -90°F to 168°.