Master Bond Inc. adhesives, sealants and coatings for optical, electro-optical and fiber-optic manufacturing applications feature outstanding spectral transmittance. Select grades can be formulated as high clarity and non-yellowing systems. Superior transparency, even in sustained high temperature situations, is a crucial characteristic of an optical adhesive. Optical adhesives are often the favored solution for LEDs, circuit boards, protective coatings on displays, LCDs and lasers and may be used as bondings, coatings or encapsulations. In addition to optical clarity and non-yellowing features, Master Bond’s adhesives for optical applications can be formulated to provide a variety of performance properties, from dimensional stability to low outgassing.
Performance properties of Master Bond optical adhesives
Master Bond’s optical adhesives can be formulated for additional performance properties including dimensional stability, low shrinkage, outstanding chemical and water resistance, abrasion resistance, and low outgassing. They can also be formulated for a range of refractive indexes from 1.43 to 1.61, resistance to 1,000 hours exposure to 85°c/85% humidity and more.
Case Study: potting application in a mini display system
A manufacturer of miniature display systems requested a low viscosity potting compound that was also optically clear and flexible. They wanted to know what Master Bond recommended. A variety of factors might change the recommended formulation.
One consideration is cure method and speed. If fast curing is the primary factor, UV15-7SP4 would be a possibility. This is a UV system that cures quickly when exposed to a UV light source between 320-365 nm. It also has low viscosity, non-yellowing properties and excellent flexibility.
For a room temperature curing system, Super Gel 9 is a two part urethane modified epoxy. It too, has low viscosity and exotherm, and may be cast in larger sections. It is ideal for encapsulating sensitive electronic parts and sealing delicate optical components.
Additional products for optical applications