Spiratex casings aid material flow with the smoothest, glossiest surface finish in the industry. Ask for a sample - and see for yourself. Our natural ULTREX™ UHMW/PE is FDA & USDA compliant. ULTREX™ UHMW/PE has exceptionally high impact resistance and abrasion resistance; is non-corrosive and temperature resistant. Spiratex can extrude your custom casing up to a 40 foot overall length. We offer the widest range of UHMW/PE casings; from 8.625" OD x 7.875" ID to .688"OD x .437" ID & many combinations in between.