... 2.different sizes and materals Mould PTFE Round Bar PTFE Bar TypeExtrusion rod ,Molding rod,anti-acid;anti-alkali ... ,natural PTFE Bar, white or black PTFE bar,filled,modled,StandardsSGS ,ISO9001-2000,FDA,ROHSSpecificationHigh ... the seal/gasket, the link material, the wearresisting board/insulation components, the corrosion resistivity profession, the mechanical spare part, ...