OSHA SILICA STANDARDS REQUIRE EMPLOYERS TO MARK-OFF REGULATED AREAS OF THE WORKPLACE WHERE EXPOSURES TO RESPIRABLE CRYSTALLINE SILICA ARE, OR CAN REASONABLY BE EXPECTED TO BE, ABOVE THE PEL. EMPLOYERS MUST POST A SIGN AT EACH ENTRANCE TO REGULATED AREAS INFORMING EMPLOYEES OF THE HAZARDS ASSOCIATED WITH THE AREA AS WELL AS THE NEED FOR RESPIRATORY PROTECTION. OUR SELF-ADHESIVE VINYL SIGNS AND LABELS ARE MADE OF FLEXIBLE, RESILIENT, 4 MIL THICK VINYL WITH A STRONG ADHESIVE BACKING. RESISTANT TO WEATHER, MOISTURE AND CORROSIVE CONDITIONS. DESIGNED FOR INDOOR AND OUTDOOR USE AND ADHERES TO MOST CLEAN, DRY SURFACES.