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In page Atmospheric entry:
"Phenolic-impregnated carbon ablator (PICA), a carbon fiber preform impregnated in phenolic resin,[1] is a modern TPS material and has the advantages of low density (much lighter than carbon phenolic) coupled with efficient ablative ability at high heat flux. It is a good choice for ablative applications such as high-peak-heating conditions found on sample-return missions or lunar-return missions. PICA's thermal conductivity is lower than other high-heat-flux-ablative materials, such as conventional carbon phenolics.[citation needed]
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