The 502015-0064 Polyimide Insulator is designed for use with an MKS 1002345150 buttweld long radius 45 degree elbow with 1.5 inch diameter vacuum tubing. Series 49UL insulators keep heat from escaping 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.