Lightweight ceramic ablators are porous fibrous ceramic substrates impregnated with organic resins. The mate rials were developed for use as heat shields for planetary entry. The compressive response and hardness of a phenolic impregnated carbon ablator and its fibrous substrates are reported. Results are also giver for charred specimens of the ablator. Fibers in the substrate tend to be randomly and uniformly aligned parallel to t preferred plane. Two characteristic compressive responses were observed, depending on the orientation of the load with respect to The preferred fiber-alignment plane.
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