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Covestro’s High-heat Polycarbonate an Ideal Choice for Silicone Overmolding

Published on 2018-05-30. Author : SpecialChem

TAGS:  High Heat Materials   

Phone Stands Formed by Overmolding Apec® 1745 High-heat Polycarbonate with Silopren LSR 4749
Phone Stands Formed by Overmolding Apec® 1745
High-heat Polycarbonate with Silopren LSR 4749
Soft-hard design calls for multi-component processes with good adhesion performance between silicone elastomers and thermoplastics. Despite advances in adhesion technology, it is still difficult to meet adhesion requirements—even when a primer is applied. To solve these challenges, Momentive launched Silopren LSR 4749—a self-bonding liquid silicone rubber (LSR) that offers primerless adhesion to a wide range of substrates.

Live Molding Demonstration at NPE2018


At NPE2018, attendees saw how LSR is used in conjunction with Covestro polycarbonate. Momentive held a molding demonstration for phone stands using Apec® 1745 high-heat polycarbonate from Covestro overmolded with self-bonding Silopren LSR 4749. This polycarbonate material can withstand higher temperatures, making it an ideal choice for the silicone overmolding process.

Chris Claussen, global marketing director for healthcare, Momentive, said:
“Apec® 1745 polycarbonate demonstrates excellent adhesion to our self-bonding Silopren LSR 4749. With high-heat stability, this grade allows for LSR overmolding at higher temperatures with much shorter cycle times.”

Pierre Moulinie, global technology lead, Medical and Consumer Products – Polycarbonates, Covestro LLC, said:
“Out of all material options, this high-heat polycarbonate offers the best combination of adhesion and high-heat resistance to assure the fastest possible curing time for Momentive’s self-bonding LSR. In fact, it reduces curing times by up to 50 percent and leads to lower production costs when compared to standard polycarbonate.”

Apec® 1745 Polycarbonate


Apec® 1745 polycarbonate is a medical grade that features outstanding clarity and is appropriate for repeated steam sterilization up to 143°C.
It can be used for several health care applications that require a soft edge or surface, such as respiratory masks, soft touch tips and applications that require gaskets.

Lauren Zetts, North America market manager, Medical and Consumer Products – Polycarbonates, Covestro LLC, said:
“We always evaluate each application to determine which polycarbonate material is right for the job. For the silicone overmolding process, our high-heat polycarbonate has what it takes.”

Apec® 1745 polycarbonate and Silopren LSR 4749 are both globally available.

Apec® is a registered trademark of the Covestro group.
Silopren is a trademark of Momentive Performance Materials Inc.


Source: Covestro LLC
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