The advantages of using Sterling Seal, Inc.’s Graphite Filled Teflon are low coefficient of friction compared to other filled PTFE materials. SSS Graphite Filled Teflon packing have a higher flexural modulus and surface hardness than unmodified PTFE. This style of packing is an interlock braid, utilizing a unique proprietary PTFE/graphite yarn and a high temperature break-in lubricant. This proprietary yarn is formed from expanded PTFE in which fine particles of Pure graphite have been encapsulated. The resulting Packing combines the chemical resistance of PTFE with the heat dissipation characteristics of graphite, thus allowing much higher shaft speeds than conventional PTFE packings. Style 165 is chemically inert over the entire 0-14 ph. range with these exceptions: molten alkali metals, fluorides, aleum, fuming nitric acid, Aqua regia, and other strong oxidizing agents This Style is an excellent general service and corrosive service Packing It is commonly used in pumps, valves, Rotating and reciprocating shafts, mixers and agitators, and is especially designed for services involving surface speeds and temperatures higher than those that can be handled by Pure PTFE Packing. Mechanical Packing, the basics: Where would I even use packing? A great example is for a boat. On a boat having an inboard motor that turns a shaft attached to an external propeller, the shaft passes though a stuffing box, also termed a stern gland in this application. The stuffing box prevents sea water from entering the boats hull. The stuffing box, in layman’s terms, is where “Mechanical Packing” goes. In general “Packing”, often referred to as rope seals can be used to create a static seal in fixed or slow-moving applications like expansion joints, doors, and valves, or a dynamic seal in equipment with reciprocating, rotating, or oscillating movement like centrifugal pumps, rotating stems, and blowers.