NMC warning sign use for indoor. Legend "BIOHAZARD". Employers are required to post biohazard warning signs and labels at the entrances to these hazardous areas. In addition, all biohazard material must be properly labeled to warn employees of the potential risk to their health. Good chemical resistance. Made of pressure sensitive vinyl. 178 degree F maximum temperature. Mounting is possible. Black on orange color. Measures 4" width by 4" height.