Shop for TUFFAK® Flame Inhibiting Polycarbonate sheets. TUFFAK® FI is a flame inhibiting non UV stable sheet that meets UL 94 V-0 at .060" and UL 94 5V-A at .125" thicknesses. Custom cuts and cut-to-size available. Stocked materials typically ship in 2-5 business days. Can’t find what you need? Get a quote.