RFID tag maker ZDCARD offers a line of high-temperature passive UHF RFID tags, encased in ceramic, for use in environments that reach 225 degrees Celsius (437 degrees Fahrenheit). The tags are intended to enable manufacturers, oil producers, hospitals and other companies to employ RFID in traditionally unfriendly environments in which extreme heat is used. 

Earlier this year, ZDCARD Manufacturing introduced a new on-metal tag to ease the use of passive UHF RFID tracking on metallic items. The small tag is designed predominantly for use in managing surgical tools, but could also work with other tools or small metallic products. And Technologies ROI offers heat-resistant metal tags that can be welded to metal objects.