Halyard tray liners are designed to be used both inside trays, next to delicate instruments, as well as underneath trays to absorb condensation and help protect sterilization wrap from sharp tray corners and edges. Tray liners are not recommended for gas plasma sterilizers; vapor phase hydrogen peroxide sterilizers or as an all-purpose wipe. - Validated for use in steam sterilization systems at 270° F or 132° C for 4 minutes. 20 x 25 inches.