The Critical Role of Material Performance and Processing Data

Successfully using liquid silicone rubber (LSR) and other advanced silicone technologies in medical devices often depends upon access to a deep and broad repository of research and test data, paired with specialized expertise in the multiple ways that material properties and processing parameters can — and do — interact. For example, a newer grade of LSR may process differently than an earlier generation, requiring a processing adjustment. Lowering processing temperature to accommodate the requirements of new wearable devices — whose sensors and batteries cannot withstand high heat — may extend cycle times, but also reduce surface defects and short shots. The direction of flow into the mold tool can affect the direction of shrinkage in the finished part, while the molding temperature in the cavity may influence mechanical properties such as modulus and tear strength. Extending in-mold cure times can help achieve sufficient cure to improve clean release to minimize scrap.