Can high-temperature wires also be used in extremely low (cryogenic) temperatures?

Yes, depending on the chemical composition. Fluoropolymers (PTFE, FEP) and Silicone maintain their molecular flexibility in extreme cold, often retaining their ratings down to -60℃ or even -90℃. Unlike standard PVC, which embrittles and shatters in sub-zero environments, these cables are ideal for aerospace, arctic infrastructure, and cryogenic gas facilities.