VP1 is 100% GORE® fibre packing. This remarkable yarn is constructed from PTFE and Graphite intimately blended and locked and then treated with a high temperature, break-in lubricant. VP1 is an outstanding packing for use in aggressive or arduous duties including the most difficult chemical environments. It is essentially chemically inert over the entire pH range. The unique combination of locked Graphite and PTFE creates a yarn with very high thermal conductivity, that does not harden, shrink, swell or dry out and that is exceptionally smooth running with negligible shaft wear. User experience with G1 fibre has shown that, in practically all cases, greatly extended service life can be expected. In order to obtain maximum benefit from this fibre, VP1 is square inter-braided via a CROSS-LOCK® process. The construction of VP1 increases the durability of the packing and reduces the gland pressure required to perform a seal. Periods between gland maintenance and packing replacement are thus even further extended and Type VP1‘s CROSS-LOCK® braiding helps overcome extrusion problems, which can be the one negative of this fibre, particularly in lower quality braids. Type VP1 standard spool length is 8 metres. Custom cross sections and lengths can be available - please contact bsolomon at Sterling Seal dot Com