Chesterton 1760 is a unique packing consisting of a PTFE yarn lubricated with graphite particles. The finished packing is further lubricated with a special silicone oil for quick break-in. Chesterton 1830 is an advanced expanded graphite PTFE packing made up of filaments developed to meet rigid specifications. Use in pumps, valves, agitators, mixers, and other rotating equipment. PTFE resin is combined with graphite and expanded by using the latest technologies, resulting in a high-quality filament.