Analytical testing or process knowledge can be used to determine if the coating particles are considered hazardous. The media is projected at a surface to gently remove coating without damaging the underlying metal. Plastic blast media can be reused until the particles are broken down too small to be effective. The plastic blast media is usually leased from a supplier and returned after the media has broken down. The broken particles are sometimes recycled into countertops and tabletops.
Dry ice is propelled by nitrogen gas or compressed air.
The ice then dissipates as carbon dioxide gas, leaving a relatively small waste stream. This process can replace many harsh chemical processes, can be used on delicate components, and may strip difficult or impossible to clean equipment. A vacuum orbital sander can eliminate hazardous particles as it removes surface coatings. A vacuum draws materials through a series of high-efficiency filters and eliminates the need to wear a respirator. Water-based coating removers are a safe alternative to methylene chloride.