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Vulcan Chem-Ring Teflon Encapsulated Seals Font size:
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Chem-Ring Teflon Encapsulated Seals Vulcan Chem-Ring Seals combine the resilience and sealing force of an elastomer with the chemical resistance of Teflon. They consist of an elastomeric core of Silicone or Vitonฎ with a relatively thin, moulded encapsulation of Teflon FEP or PFA polymer. This produces an elastomeric PTFE seal with maximum sealing capability. Elastomeric, rubber "O" Rings suffer from high friction and limited resistance to aggressive chemicals and gas permeation. Solid Teflon "O" Rings are rigid with no effective memory and high compression set. FEP Encapsulated "O" Rings are solvent resistant and chemically inert (except for attack by alkaline metals, fluorine and some halogenated compounds at high temperatures) yet have an elastomeric memory near that of rubber "O" Rings. FEP polymer, also, has an extremely low coefficient of friction (0.1 to 0.2) and very low permeability to gases, making Chem-Rings a virtually universal seal for use in hostile environments.
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Vulcan Mechanical Gland Packing Font size:
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Mechanical Gland Packing All Vulcan packings are square-braided on the most advanced specification braiding machines available. Twenty four and thirty six track braiders are utilised to produce four-ply, square inter-braid packings on all sizes from 3/8" (10mm) upwards. Fibres are run from the core of the packing section to the corner-posts and surfaces, whilst being cross-locked in a square, lattice construction, to produce maximum resilience and a highly dense, square packing. The quality of a packing's braiding significantly affects the service life of the packing. Packings produced using smaller or outdated braiding machines lack the strength of true cross-lock, are less dense and are not as square in cross-section. The looser the braid of a packing, the lower its durability will be. Additionally, greater gland pressure is required to perform a seal, resulting in increased mechanical stress. As the packing deteriorates, frequent gland adjustments are required, causing more mechanical stress on the packing, leading to accelerated failure. Vulcan packings show a high degree of resilience and consistency of volume. Their superior, lattice, square inter-braid construction needs less gland pressure to seal, resulting in reduced equipment wear, reduced gland maintenance and increased packing life.
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Tefcan Expanded PTFE Sealants TEFCAN is manufactured from 100% Expanded PTFE which is highly compressible and provides excellent sealability. This Expanded P.T.F.E. Gasketing is available in Sheet, Gasket Tape or Cord form. The exceptional properties of PTFE, combined with the unique nature of its expanded structure, contribute to the long life of seals made with TEFCAN. PTFE is completely unaffected by virtually all chemicals and corrosive environments. TEFCAN will not contaminate flow products nor deteriorate with age. Tefcan Universal Joint Sealant is manufactured as a continuous cord, with a self-adhesive backing strip. This unique, expanded PTFE cord conforms to irregular shapes and surfaces. Compressing into a thin, wide ribbon, it produces a tough, inert, long-lasting gasket that seals against extremes of temperatures, pressures and corrosive media. Tefcan Sheet Gasketing is manufactured from pure expanded PTFE, drawn into a homogeneous sheet of uniform thickness, offering exceptional superior sealability. The Gasket Tape provides the same material and sealing benefits as Tefcan Sheet but is in a continuous strip form, available in a range of widths and thicknesses. Tefcan Gasket Tape combines the advantages of Tefcan Universal Joint Sealant and Sheet Gasketing to form cut full-face, or strip sheet, gaskets with minimal waste