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. MADE OF CORRUGATED PLASTIC, OUR FOLDING FLOORSTANDS SHIP FLAT AND ARE WEATHER RESISTANT FOR INDOOR AND OUTDOOR USE.