The 502025-0017 Polyimide Flange Insulator is designed for use with NW63 size ISO flanges with 2.5 inches vacuum tubing on one side, hose or bellow tubing on the other and clamped with a model 100761106 double claw flange clamp. Series 49UL flange insulators keep heat from escaping at flange connections for better temperature uniformity in vacuum piping applications. Polyimide constructed heater jackets can be used in all critical applications where minimal outgassing, ultra-low particle generation, elevated temperatures up to 200°C, and ease of installation are required. These patented heaters are constructed with fully squared ends and a form fit shape to maximize thermal efficiency and temperature uniformity, minimizing thermal losses and power consumption.