Integrity combined their Ultrex material with three panes of glass and argon glass for windows with Tripane glass. The glass has U-factors of .18 to .20 due to the argon gas. Wood-Ultrex casements and awnings using the glass received Design Pressure ratings of 50. The window option comes in all current design and hardware options as well as nearly all current casement and awning sizes, including special sizes available in 1/64-in. increments.