Metal Comma-Ring Internal Pressure COI Common Metallic Material Options •Alloy 718 Common Plating Options • Silver Groove and Seal Design Note: Load and spring back figures are based on Alloy 718 in the heat-treated condition. Actual performance should be accordingly considered due to various working conditions. Tolerances on groove depth, plating, diametrical clearance, and differences in material batches can create differences of up to 100% for the cross section less than 3mm, down to 50% for the bigger cross section. Groove Finish Recommendation Groove finish is a critical factor for metal seal. Depend on different medium, Sonkit recommend the following groove surface roughness The tightness with a Comma Ring (COI) is more than with any other metal seals in a function of the bore condition. The finish surface of the bore should be smoothly polished, meanwhile, a certain degree of pressure is required for fastening. With these measures in place, the sliding motions of seal can be avoided, which would extend the seal's life cycle and therefore enhance the safety of applied machineries. In addition, we advise to silver plate Comma ring for better tightness, reduced friction, and wear. • Piston seal • Rod seal ■ Semi-dynamic • Rotational and reciprocating applications Test Report