... single or multiple alloy heating wire as a heat source, high purity, high temperature, fused crystalline magnesium oxide thermal conductivity of an ... )A vacuum: a special treatment process to ensure that high temperature (750 ° C), high vacuum (1 × 10Pa) environment, no infiltrationair leakage;2 ... rail, Road Fork, heating, insulation of the place4.We can product any shapes as the following pictures.