optical glass rod ISO9001:2008 insulators' core rod in insulators. excellent acid resistance and anti-brittle property optical glass rod epoxy fiber bar is made from fiberglass roving.continuous strand mat and surface mat which are impregnated with resinRods Diameter: φ12, φ16, φ16.5, φ16.8, φ17.48, φ18,φ16, φ16.94, φ17.48, φ18, φ20, φ 22, φ24, φ30,φ34, φ35, φ 38, φ40, φ45, φ48, φ50, φ60, φ70, φ ...