Use and characteristics 1. Used to heat up and fuse fusible crack-filling materials for cement and asphalt roads. 2. It is safe, quick, and environmentally friendly to heat up the sealants indirectly by heating up the heat-conduction oil. 3.The temperature is controlled automatically, and shown on a meter with a digital liquid crystal display. 4.It includes a standing two-way mixing plant. Applying exhaust re-use system to effective heating greatly.