LSR (Liquid Silicone Rubber)

Sur-Seal® Liquid Silicone Rubber (LSR) is precisely the optical solution you’ve been searching for. In optics and lighting, material degradation is a constant frustration. PMMA, polycarbonate and glass wind up yellowed, deformed and easily damaged over time.

A drawn-out, iterative design process is necessary simply to try and reduce the long-term effects of degradation on performance.

Optical grade silicone overcomes all these challenges at once, while simultaneously offering unmatched material performance and design flexibility.

What is LSR?

LSR stands for liquid silicone rubber. Its two most distinctive characteristics are low viscosity and material expansion when injected into a heated mold. These characteristics allow for thick-walled parts absent of sink marks, thin wall molding and accurate replication of micro-features.

Some of LSR’s other distinct advantages include:

  • Superior optics
  • Greater design flexibility
  • Less susceptibility to cracking, scratching or manufacturing defects
  • Improved reliability of the final product
  • Low molded-in stress
  • Low birefringence
  • Good chemical resistance

That reliability is best seen in the stability of the final product over time. Silicone optics effectively resist:

  • Yellowing
  • Loss of transparency
  • Thermal and UV damage

LSR has broad applicability for molding across many industries. Among these industries, some of the most prominent include:

  • Healthcare
  • Automotive
  • Lighting
  • Electronics

No matter which stage of development your product is in, our team can help. From napkin sketch to full-scale assembly and packaging – we have the expertise you need.

Our patented LSR over-molding techniques enable our customers to push the limits of their optical design. These techniques do not require
a seal or gasket between the lens material and housing – LSR combines a seal and optical lens or light tube in a single, streamlined
component. These techniques:

  • Create a cost-effective assembly process
  • Minimize the total number of parts involved
  • Promote innovative designs, leading the way for the next generation of optics