In order to obtain maximum benefit from this fibre, VP1 is square interbraided via a CROSS-LOK 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-LOK braiding helps overcome extrusion problems, which can be the one negative of this fibre, particularly in lower quality braids.

Applications
See below as per Style VP1B.

G1 yarn is constructed from PTFE tape and Graphite inter-locked to create a true synergy between these two premier packing materials. High temperature break-in and running lubricants are added to the yarns, prior to braiding in our CROSS-LOK lattice. The result is an exceptional process packing that gives, often many times, longer service life in the vast majority of applications. With the exceptions of high mechanical load (highly abrasive media or high pressure) or temperatures above PTFE's limit of 280°C, VP2 is the ultimate packing.

VP2 resists all chemicals across the entire Ph range (except Oleum, Aqua Regia, fuming Nitric Acid and Fluorine), is self lubricating and does not shrink, harden nor dry out. The packing is very cool running with exceptionally good thermal conductivity thus practically eliminating shaft scoring.

Applications
For use wherever the value of the best quality and material packing can be realised. Since the actual purchase cost of a packing is typically only 3% of the true utilisation cost, Sampson's recommend these PTFE GRAPHITE packings for all possible applications. They will increase service life whilst minimising wear and gland adjustments, against nearly all media in static, rotary and reciprocating uses.