Type VR4 combines and maximises the performance of Expanded Graphite and Graphite fibres. Expanded Graphite is the ultimate valve sealing material, but it may extrude or deteriorate, in more mechanically demanding, rotary applications. The addition of Pan Graphite fibres adds strength and increases heat dissipation, which further enhances the packing’s life and performance. Type VR4 is square inter-braided, with the Pan Graphite fibres running from core to the corner posts, to give dimensional stability and to resist extrusion. The Expanded Graphite fibres are braided to the packing surfaces, to enhance smooth running and sealing performance. Type VR4 is The Expanded Graphite Gland Packing for use in rotary applications. Shaft wear and gland maintenance are virtually eliminated, as the Gland Packing is self-lubricating and includes, passive, corrosion inhibitors. Type VR4 standard spool length is 8 metres, aside from cross-section sizes 3mm and 5mm where the standard length is 30 metres.Custom cross sections and lengths can be available - please contact bsolomon at Sterling Seal dot Com