The 4520 protective coverall helps protect against light liquid splashes and hazardous dusts. Typical applications for this safety work wear may include: Woodworking, General Powder Handling, Light-Duty Building Cleaning, insulation laying and Metal Polishing. Medium. The 4520 protective coverall from 3M is disposable safety work wear made of lightweight, breathable polypropylene It helps provide basic barrier protection against light liquid splashes and hazardous dusts