MotoRad is a key supplier of wax elements, manufacturing 15 product types, mainly for OEMs and Tier-1 automotive suppliers. Wax elements (also known as pellets) are a key component of all standard engine thermostats, forming a miniature hydraulic system used to regulate coolant supply to a vehicle’s engine. The wax element’s central components are the piston/pin and expansion wax. As the engine heats up the expansion wax transforms from a solid to a liquid state, expanding by approximately 10-15%. The expanding wax element pushes the thermostat’s center piston out, supplying coolant to the engine.