TPE/TPR soft plastic in different hardness of the overmolding application

  • Time of issue:2023-02-10
  • Views:481

TPE/TPR soft plastic in different hardness of the overmolding application

  • Categories:Industry News
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  • Time of issue:2023-02-10
  • Views:481

  TPE cover usually refers to the use of hard plastics and soft plastics of these two materials for cover glue bonding. Hard plastics are usually general engineering plastics (such as ABS, AS, GPPS, HIPS, PA, PC, PC/ABS, PE, PP, etc.), while soft plastics are most commonly TPE/TPR elastomers. TPE is usually referred to as SEBS type styrene thermoplastic elastomer modified material, and its unique advantage is that it has a wide range of adjustable hardness.

  TPE and TPR materials are typically used for overmolding in the hardness range of 30 to 90 degrees (ShoreA). Different application requirements of the product, for the selection of TPE hardness, or there are certain rules to follow.

  1, 30 ~ 40 degrees lower hardness TPE overmolding. Often used in some soft contact requirements of the product, such as medical products, some high-end sports equipment handle, electronic products, etc.. The thickness of these products is usually larger, can reach 3~10mm.

  2、45~65 degree medium hardness TPE overmolding. Often used in some power tool handles, kitchen utensils, knives and scissors, screwdrivers, daily tools, luggage accessories, etc. The hardness of human skin is usually around 55 degrees, usually this kind of contact with the hand, TPE soft rubber material usually choose and human skin close to the hardness, in order to get the best contact comfort.

  3, 70 ~ 90 degrees higher hardness TPE overmolding. It is mainly used in the overmolded products with flat surface, large overmolded surface and thin thickness, such as electronic appliances, digital games, cell phone IPAD, communication instrumentation products. This kind of thin products, flat, large area of the overmolded products, need TPE with high fluidity, low shrinkage, appropriate surface hardness and other characteristics, therefore, must use a higher hardness of TPE to achieve.

  Different products, for TPE overmolded material hardness has more strict requirements, hardness is generally provided by the customer, the supplier does not give advice on this. Unless the customer is developing new products independently and there is no a standard for hardness.


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