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Boeing Lightweight Ablator (BLA) on Starliner

ablative material is designed to slowly burn away in a controlled manner, so that heat can be carried away from the spacecraft by the gases generated by the ablative process while the remaining solid material insulates the craft from super-heated gases. 

 SIRCA, Silicone Impregnated Refractory Ceramic Ablator, was used on Space Shuttle and Viking programmes

SIRCA has a typical density of 0.2 to 0.4g per cc, and can withstand heat flux of up to 300 W per cm2. Easily machined to custom shape.

BLA:
silicone based honeycomb ablator.
base silicone resin, silica microballoons as filler
density: 0.3g per cc
withstand temperature up to 1760C ( 3200F)

US Patent US6627697B2

whereas SpaceX use PICA-X, Phenolic Impregnated Carbon Ablator based
density: 0.27 g per cc
withstand over 3000F
re-entry speed of Mach 24
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