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Sketch Description
grafmet_960GRAFMET® 962grafmet_962GRAFMET® 970grafmet_970GRAFMET® 972grafmet_972GRAFMET® 960 Rgrafmet_960_rGRAFMET® 971grafmet_971

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.


Program includes:

  • various construction of sealing discs / sealing seats of 2-off-set and 3-off-set used in BUTTERFLY valves (solid or laminated versions freely available)
  • solid metal, laminated metal-graphite or graphite with reinforcement spherical seats for the BALL valves (also seats integrated with the metal cover)
  • large number of types of secondary gaskets installed in the are of valve seats



Program includes:

  • Single preformed rings made from pure expanded (GRAFMET® 950) graphite or from any braided packings used either alone or in the sealing sets. Our preformed rings (thanks to usage of first class quality materials) shows excellent non-ageing properties, creep resistance, high temperature resistance. Standard density of rings: 1.35 g/cm3 or 1.6 g/cm3 (other densities upon request).
  • ‘Ready to install’ sealing sets applied in the highest duty valves and fittings; composed of the GRAFMET® 950 family ring, braided packing rings or combination of them. Dimensions and configuration (e.g. typically 3 pieces of GRAFMET® 950 inside and 2 pieces of SPETOPAK® braided packing rings outside) upon request.
  • ‘High Tightness’ sealing sets being in compliance with various ‘CLEAN AIR ACTS’ (the tightness criteria like German VDI 2200 and can be regarded as a high-grade sealing system for the purposes of ‘CLEAN AIR ACTS’ eg. TA-LUFT.
    • special shape / special construction pure graphite rings (SPETOPAK WGR TA) or
    • specially prepared braided packings (SPETOPAK® WGR® 8515, SPETOPAK® WGR® 8535) combined with high density rings and special metal cap for high sealing performance especially for chemical and petrochemical box valves.
    • Please not that due to Best Abvailable Technogy priciples of SPETECH there are others ‘High Tightness’ packings sets in certification progress (e.g. SPETOPAK® WGR® 8530). If interesting in this area - please contact us for updated list of certified ‘High Tightness’ packings.