Seal, is a product that seals something so that it cannot be easily opened, and plays the role of shock absorption, waterproof, sound insulation, heat insulation, dustproof, and fixing. Seals are made of rubber, paper, metal, plastic and other materials. Since the 80s, the seals have been applied to various industries such as automobile, doors and windows, cabinets, refrigerators, containers, etc. According to the requirements of different industries, we have developed unique products such as automobile seals, mechanical seals, door and window seals, etc.

　　Recently, the customer needs to make a TV inner casing sealing strip, the requirements, the material dimensional stability, the material does not deformation shrinkage after assembly. Engineering reference customers to provide OK material samples to make samples, preliminary analysis: material is PP plus TPV modified material, physical analysis: hardness: 94-95A, the focus is to open the mold when the shrinkage rate of the material to be true. The product is 1.1 long and is injection molded by more than 800T machine.

　　Through comparison and analysis, the engineering first recommended one of our company: ENB95A2-03, to the customer test molding out of the mold OK, but compared with OK board, the surface is too bright, the size of the length is greater than the design length NG. test material back and engineering communication, analysis of the reasons, the material surface bright, TPV composition is low. The dimensional stability of the material is not enough and the shrinkage rate is not right. Engineering into the improvement program: 1. Add more TPV content, improve the material elegance.  2. Canna rice calcium carbonate to improve the temperature stability of the material 3. Use high temperature resistant PP modified again to provide sample material to the customer test material: ENB95A3-01, the results NG, material size stability, the effect is not good, the reason is: the use of high molecular weight SEBS 533 in the material, polymer material shrinkage is larger, so need to be modified with medium molecular materials, again a sample: ENB95A -SL, after the customer trial material forming OK, 5 days size test is stable state OK, this project mass production success.

　　Summary: Through this project trial material comparison, from the material shrinkage and dimensional stability, ENB95A-SL is better than ENB95A3-01. The dimensional stability of medium molecular SEBS material is better, and the product is not easy to produce stress deformation or shrinkage in the injection process. Such seal products, if the product size requirements are high, all can use this solution.