Shop for Metal and X-ray Detectable PEEK Rod. TECAPEEK® UD is a dark blue FDA compliant detectable PEEK designed for the food and beverage processing and pharmaceutical industries. This metal and X-ray detectable material has a heat deflection temperature of over 300°F and excellent resistance to a wide range of cleaning chemicals. Stocked materials typically ship in 2-5 business days. Can’t find what you need? Get a quote.