PREFORM FABRICATION INVOLVES RIGIDIZATION OF 3M NEXTEL™ 312 FIBROUS SLEEVES

Concentric 3M Nextel™ 312 tubular sleeves
pulled over mandrel - (Al/Si/B) oxide

Impregnated with phenolic resin

Preform compressed to desired thickness

Baking schedule leaves carbon deposit; rigidizes preform

40% - 45% fiber volume desired

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