As LEDs increasingly supplant metal filaments in light bulbs, optical LSR — in addition to plastics like polycarbonate and acrylic resins — is replacing glass in many optical applications including lens covers and light pipes.
The flexible, transparent material is second in clarity only to glass; it can withstand heat in proximity to high-output LEDs and operate in a range of ambient temperatures. Optical LSR is flexible enough for rough duty, outdoor and automotive use. It also allows for very flexible design including accurate replication of fine features. It can support minor undercuts and negative draft without the need for side-actions, and both thick and thin walls. Designs in this material can often integrate multiple parts into a single unit, combining for example a lens, a clear lens cover and a sealing gasket, reducing the bill of materials for a final assembly.
Proto Labs stocks Dow Corning MS-1002 LSR, a material that has been engineered for molding finely detailed parts for LED applications. Read our full Design Tip to see how optical LSR might help on your next lighting project.