High temperature carbon-carbon composites (C-C) are increasingly used in both aerospace and commercial products. Hypersonic missiles, reusable reentry vehicles such as the space shuttle and National Aerospace Plane, aircraft brakes, and hot section jet engine components are a few examples. As costs decline with increasing volume usage, C-C will find other applications, such as biomedical products. For the present and near future, major applications will be for high temperature structures operating at temperatures above 2,000 F