UV Mirror filter has reflection that is greater than 85% from 220 nm to 250 nm. This unmounted UV mirror filter is coated on a 1.04 mm thick fused silica substrate and is 25.4 mm in diameter. Alluxa mirror filters deliver superior performance and durability over traditional laminated filters. All Alluxa optical filters are hard-coated using our innovative SIRRUS™ plasma deposition process. Contact us for custom sizing.