The gasket in heat exchanger not only plays the role of leakage of the sealing medium, but also prevents the heat exchange medium from intermixing in practical applications, and the heat exchange between the plate heat exchangers also occurs in the gasket. How to extend the life of the gasket plays a crucial role in the life of our entire plate heat exchanger.(1) The kneading material of the kneaded rubber is kneaded in a closed or open type rubber mixer. Mixing the raw material components weighed according to the formula evenly. After laboratory testing, the rubber compound is used for gasket production.(2) Molded plate exchanger rubber seal gasket is made by molding in the press, that is, the unvulcanized rubber strip semi-finished product is placed in the cavity of the hot mold, and the mold is closed and vulcanized, and the molding temperature is 160. ~185°C, time 3~15min, depending on the type of rubber compound, the molding pressure should be no less than 9.8MP(3)Post-vulcanization In order to increase the production capacity of the production line, the vulcanization is not completely completed in the molding process, and the vulcanized gasket is placed in an oven under static conditions to complete the vulcanization. The degree of the oven must be uniform and the holding time varies with different rubber compounds. Vulcanization is an extremely important step in the production of plate gasket rubber gaskets. The oven must be fitted with a device with continuous temperature recording.