Standard sizes: NW10...63

The flange dimensions are identical to the KF flanges, except the flange thickness, which is 4mm instead of 3mm. The 4mm thickness makes the glass flanges stronger to prevent cracking when the chain clamp is tightened.

The available materials comprise Duran® (up to 450 degC) and quartz (up to 1000 degC). While the maximum operating temperature is usually limited by the seal in use, especially endurance of short-term temperature shocks are part of the important operating characteristics of these parts.