NMC OSHA sign. Header "NOTICE" and Legend "NO ADMITTANCE AUTHORIZED PERSONNEL ONLY". OSHA sign is the perfect way to alert your employees and guests when a hazard is present in your facility. Keep your facility safe, buy an OSHA regulated sign today and prevent an accident tomorrow. These OSHA signs comply with OSHA 29 CFR 1910.145. Rigid plastic - 0.050 thick polystyrene material is ideal for long lasting indoor or outdoor use. Mounting sign. Good chemical resistant. Maximum temperature: 183 degrees F. Black/blue on white color. Measures 14-inches length by 10-inches height.