Paraffin wax is obtained by distilling the crude oil from the crude oil by solvent refining, solvent dewaxing or freeze crystallization from wax, pressing and dewaxing to obtain wax paste, and then deoiling, and supplementing and refining the flake or needle crystals. According to the degree of processing and refinement, it can be divided into fully refined paraffin, semi-refined paraffin and slack paraffin.

The most famous paraffin wax is Kunlun brand .Its main producing areas are Daqing, Fushun and Dalian. Daqing’s advantageous products are semi refined 58/60 degree .Fushun has a full range of paraffin wax, mainly full refined like 54/56，56/58，58/60，60/62 degree .Dalian also has many items ,like fully refined 56/58，58/60，60/62 degree .the quality in Dalian is the best ,but the price is not good than others .

As a kind of latent heat energy storage material, paraffin has the advantages of large phase change latent heat, small volume change during solid-liquid phase change process, good thermal stability, no supercooling, and low cost.