This specification covers a single-component, heat-reactive, thermosetting aromatic system which thermally cures to form a polyimide polymer structure.This product has been used typically as a resin matrix for fiber-reinforced- composite parts requiring good strength after long-term exposure up to 315 mDC (599 mDF) and after short-term exposure up to 370 mDC (698 mDF), but usage is not limited to such applications.