ULTEM PEI The ULTEM Resin family of amorphous thermoplastic polyetherimide (PEI) resins offers outstanding elevated thermal resistance, high strength and stiffness, and broad chemical resistance. ULTEM is available in transparent and opaque custom colors, as well as glass filled grades. Plus, ULTEM copolymers are available for even higher heat, chemical and elasticity needs. ULTEM resins uniquely balance both mechanical properties and processability, offering design engineers exceptional flexibility and freedom. Sabic Ultem 4001-1100 Natural Packing:25kg/bag this item is for purchasing 1bag of 25kg.