Shop for Glass-Filled Ultem® sheets. Ultem® 2300, glass-filled Ultem®, is reinforced and provides enhanced stiffness, strength and dimensional stability for more demanding applications. Custom cuts and cut-to-size pieces available. Have machined into fabricated parts. Ultem® comes in many colors. Stocked materials typically ship in 2-5 business days. Can’t find what you need? Get a quote.