Demoulding agent is a functional substance between the mold and the product. In the rubber and plastic manufacturing industry, when manufacturing model products, in order to demoulding, improve production efficiency, prolong the service life of the mold, at the same time, make the product smooth, qualified size, reduce waste, and need to use an essential auxiliary agent. Its main function is to make the demoulding operation easy to prevent the damage caused by forced removal of the product. The isolation of the release agent depends on its surface properties, its significant characteristic is the critical surface tension is small, it is difficult to be wet by the liquid, because of this, in order to achieve the role of release. Rubber release agent is used to prevent rubber products and mold surface adhesion, and can make it out of the mold without tearing a class of substances. It is sprayed or coated on the surface of the cavity to form an effective isolation layer. The main requirements of the release agent are: a certain thermal stability and chemical inertia, do not corrode the cavity surface; Residual decomposition under the surface of the cavity; Does not affect the product color, but can give a good appearance, non-toxic; Easy to prepare and use.