A new electrical grade thermoplastic for high frequency insulation

The purpose of this paper i9 to describe the electronic and engineering properties of high frequency grade PPO® polyphenylene oxide. All grades of PPO and Noryl® thermoplastic resin have low and stable electrical properties and there is a special grade designated 681-111 which has low dielectric loss properties into the gigacycle range. It also has excellent structural strength which classes it as an engineering plastic. This is the unique aspect of this material: no other engineering thermoplastic (nylon, polycarbonate or acetal) has the low, stable dielectric properties of PPO. And no good dielectric (fluorocarbons or cross-linked ethylenes or styrenes) has the structural strength of PPO. An additional advantage is its high heat distortion temperature of 375°F. This allows it to withstand dip soldering and other peak temperature requirements.