Whitepapers

The aerospace industry, primarily satellite manufacturers, have expressed the need for a low outgas, thermally stable, adhesive tape. The current products in the marketplace have limitations at both high, 175ºC, and low, -100ºC, temperatures. A new silicone Pressure Sensitive Adhesive (PSA) was developed to pass ASTM E-595(1), low outgassing requirements...

The aerospace industry, primarily satellite manufacturers, have expressed the need for a low outgas, thermally stable, adhesive tape. The current products in the marketplace have limitations at both high, 175ºC, and low, -100ºC, temperatures. A new silicone Pressure Sensitive Adhesive (PSA) was developed to pass ASTM E-595(1), low outgassing requirements of 1% or less Total Mass Loss (TML) and 0.1% or less Collectable Volatile Condensable Materials (CVCM). This PSA was then fabricated into a tape and measured for performance and compared to other non-low outgassing silicone PSAs. The basics were outlined in a presentation presented at the SAMPE technical conference in Long Beach, CA, May 2004(2). This paper will expand on this technology by providing testing data at both high and low temperatures, comparative testing under different conditions with industry standard acrylate tapes, and more details on the fabrication of the tape.

Although silicone technology has been around for over 5 decades, this unique material continues to find usage in new applications. Its various functionalities allow its usage as fuel resistant gaskets, inert implantable devices in the body, coatings for Atomic Oxygen protection in space, and for interocular lenses for cataract disease.

Although silicone technology has been around for over 5 decades, this unique material continues to find usage in new applications. Its various functionalities allow its usage as fuel resistant gaskets, inert implantable devices in the body, coatings for Atomic Oxygen protection in space, and for interocular lenses for cataract disease. This paper will examine various silicones as effective encapsulants and lenses for High Brightness LEDs (HB LEDs). Physical and optical characteristics will be tested to determine which materials may prove to be the best.

This paper explores the need for low outgassing, thermally stable, high performance materials for electrooptic and electronic systems, citing various applications of low outgassing materials in electro-optic and electronic systems. This paper also describes the chemistry of silicone polymerization, identifying the source of outgassing components in silicones as well as...

This paper explores the need for low outgassing, thermally stable, high performance materials for electrooptic and electronic systems, citing various applications of low outgassing materials in electro-optic and electronic systems. This paper also describes the chemistry of silicone polymerization, identifying the source of outgassing components in silicones as well as the procedures for eliminating these volatile materials—solvent washing or wipe film evaporating. Finally, a comparison of low-outgassing versus nonoutgassing materials verifies low outgassing materials performance quality, even after additional processing.

From the perspective of a silicone material chemist, this paper will address the benefits of using silicone in phosphor dispersions for High Brightness LED (HBLED) packages. This investigation first provides an overview of how versatile of a material silicone can be to the HB LED industry. An examination of the...

From the perspective of a silicone material chemist, this paper will address the benefits of using silicone in phosphor dispersions for High Brightness LED (HBLED) packages. This investigation first provides an overview of how versatile of a material silicone can be to the HB LED industry. An examination of the chemistry of silicone, the multiple material composition options and various cure chemistries demonstrates how silicone can be tailored to fit specific applications. A brief discussion of both physical and optical properties of two types of material compositions, Cured Gels and Thermosets, the most common types used in HB LED packaging. Then, a general investigation of the way a silicone interacts with a phosphor, in regards to compatibility, particle size and potential interactions. The paper will also review methods of dispersion, processing considerations and equipment.