Industrial phenolic resins, normally used with acid catalyst, have been formulated into auto-catalyzed resins for B-stage prepreg production. Multi-component formulations have been prepared into three classes, A, B and C, showing fast (2-4 days), medium (7-9 days) and slow (14-18 days) thickening process, at room temperature. To optimize the formulations as a function of thermal and fire resistance, Thermogravimetric Analysis (TG), has been used. Cured samples from A, B and C classes, scanned from room temperature to 650'C, showed different thermal resistance as expressed by the weight loss.
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