High-heat Apec® polycarbonate for silicone overmolding

Strong adhesion, fast cycle times

Consumer, healthcare and automotive are just a few of many markets featuring applications with soft-hard designs. To achieve the best results, it’s important to start with the right materials.

Momentive formed phone stands by overmolding Apec® 1745 polycarbonate with Silopren LSR 4749. (Photo: © 2018 Momentive Performance Materials Inc.)


Overmolding with liquid silicone rubber (LSR) is used to create designs with both soft and hard features, which often require good adhesion performance between silicone elastomers and thermoplastics.


For LSR overmolding, it is often difficult to find two materials that work well together, even when using a primer. Because of this, self-bonding LSR - which does not require a primer - is often used to help meet adhesion requirements for a wide range of substrates.


With the best combination of adhesion and high-heat resistance, Apec® 1745 polycarbonate is an ideal choice for LSR overmolding-reducing curing times by up to 50 percent when compared to standard polycarbonate. It is the right fit for healthcare applications that require a soft edge or surface, such as respiratory masks and soft touch tips. At NPE 2018, Momentive demonstrated how its self-bonding Silopren LSR 4749 can be overmolded onto Apec® 1745 polycarbonate to create a phone stand.

Case Profile






Silicone overmolding

Apec® – the state of the art thermoplastic that can beat the heat with phenomenal material properties

  • Apec® 1745 high-heat polycarbonate features high flowability, allowing for thin-wall designs and high productivity.
  • This high-heat polycarbonate is suitable for applications requiring superheated steam sterilization up to 143 °C.
  • Apec® 1745 high-heat polycarbonate enables high temperature processing, allowing for LSR overmolding.
  • Apec® 1745 high-heat polycarbonate is biocompatible, according to many ISO 10993-1 test requirements.
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