GRAFMET^® 960 is a die-formed ring from expanded graphite of 1.6 g/cm3 density and industrial or nuclear purity (GRAFMET^® 960N), applied in valves and vessels as so called self-sealing gasket. The gap between the body and the cover, cover and the press ring, press ring and the body should not be bigger than 0.7mm for GRAFMET^® 960; for bigger gaps and when contact stresses δ>100 N/mm2, GRAFMET^® 962 is recommended. At present, GRAFMET^® 960 i s r einforced w ith s tainless steel foil. GRAFMET^® 962, also of trapezoid cross-section, is externally reinforced by metal caps which prevent the extrusion of graphite when the gaps exceed 0.7mm and high contact stresses over 100N/mm2 occur; additionally, the caps protect the graphite from erosion and oxidation; for big diametres and wide gaps, metal caps may be machined – GRAFMET^® 962 M, such a sealing solution is most commonly applied in vessels to seal their covers. When the rings have rectangular cross section, their designations are accordingly GRAFMET^® 970 and GRAFMET^® 972 with machined caps.

The GRAFMET^® 970 rings are available in a special TRANSFLEX^® set containing metal sectional rings of variable dimensions enabling compensation of clearance, even large ones of unpredicted dimensions, on existing high-temperature great-flow fittings and/or apparatus and heat exchangers, under self-caulking covers. A soft component can be offered as a pre-formed graphite ring, e.g.: TRANSFLEX^® 960/970, or woven packing, e.g.: TRANSFLEX^® 960/880. Structures for rectangular stuffing-boxes are also available. In such a case, soft sealing component remains unchanged whereas two expanding rings are installed on the box bottom. This is the Transflex^® 970/970 product.