Shop for Metal and X-ray Detectable PBT Sheet. HYDEX® 4101 UD sheet is an FDA compliant food grade blue PBT for food processing and conveyor applications often used when low moisture absorption, resistance to staining, or resistance to cleaning chemicals is required. This multi-detectable PBT sheet offers visibility for all three detection types including optical scanners, metal, and X-ray detection equipment. Stocked materials typically ship in 2-5 business days. Can’t find what you need? Get a quote.