Every employer, contractor or subcontractor, if any, shall provide his workers free of charge protective equipment for their eyes, face, hands and feet, and lifeline, safety belt or harness, gas or dust respirators or masks, and protective shields whenever necessary by reason of the hazardous work process or environment, chemical, radiological, mechanical and other irritants or hazards capable of causing injury or impairment in any part of the body through absorption, inhalation or personal contact.