Room Temperature Tightness Test (ROTT) and Hot Operational Tightness Test (HOTT) data is now available for the Halo Seal. ROTT tests determine the gasket constants Gb, a and Gs at room temperature which are used for PVRC method of flange design. The test very accurately measures gasket leakage and deflection at progressively higher gasket loads, as well as during unloading (i.e. due to creep and internal pressure).

The HOTT test extends the ROTT concept to elevated temperatures and provides a good basis for evaluating the likely gasket performance for a range of joints and service conditions.