The 502035-0016 Polyimide Flange Insulator is designed for use with ISO flanges with 3.0 inch vacuum piping (3.5 in outer wall diameter) on both sides 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 225°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.