Compression Packing Seals Specifications

Material and Lubrication


	Material Classification:		Yarn packings are usually combined with a lubricant. The amount of lubricant required varies with the type of service. A packing used for high-speed rotary motion would normally be of a softer material type to maintain flexibility over time and contain a large amount of lubricant, while a packing used for static applications would not normally contain lubricant.
	Your choices are...
	Acrylic		Synthetic yarns are used to upgrade performance characteristics. Acrylic is good for use in low temperature general service with slightly acidic fluids.
	Alumina Silicate		Exhibits good performance in extremely high temperature service but is limited to static seals or slow movements.
	Aluminum		Metallic packings are fabricated from specially treated, lubricated metal foil ribbons. They are available in the form of spiral-wrap packings, folded / twisted packings or wrapped around a resilient core.
	Aramid		Fibers of aromatic polyamides, aramids, have excellent resistance to high temperatures and exceptional tensile strength.
	Asbestos		Asbestos yarns are the traditional choice for higher temperature services.
	Carbon		Made from carbon yarns, these pitch-based yarns have life expectancies and thermal characteristics not found in other products. They also have low friction coefficients for less shaft wear.
	Ceramic		Ceramic fibers have better temperature and chemical resistance properties than asbestos but are not easily formed into braided or plaited packings.
	Copper		Metallic packings are fabricated from specially treated, lubricated metal foil ribbons. They are available in the form of spiral-wrap packings, folded / twisted packings or wrapped around a resilient core.
	Cotton		Cotton and flax are the most widely used fibers.
	FDA Approved PTFE		FDA approved PTFE filament for use in food processing industry.
	Fiberglass		Glass fibers have excellent thermal properties, dimensional stability and tensile strength. They will not burn and dissipate heat faster than organic fibers.
	Flax		Long-fiber roving yarns that are braided and impregnated with lubricant.
	GFO®		A trademark of WL Gore.
	Graphite		Braided from high purity graphite filaments, these filaments have excellent chemical resistance, are thermally conductive and can be used in extreme temperatures and pressures.
	Graphite / Asbestos		Newer graphitized asbestos packings with superior lubrication provide cooler running and lower friction with excellent high temperature performance.
	Hemp		Hemp is another widely used fiber, but to a lesser extent than cotton or flax.
	Inconel® Wire Reinforced		A registered trademark of Inco Alloys International, Inc.
	KYNOL®		A trademark of American Kynol, Inc.
	Lead		Metallic packings are fabricated from specially treated, lubricated metal foil ribbons. They are available in the form of spiral-wrap packings, folded / twisted packings or wrapped around a resilient core.
	Leather		A traditional packing used in low and medium pressure reciprocating motion applications.
	PBI®		A registered trademark of Celanese Corporation. PBI is an acronym for the term "polybenzimidazole", a high performance organic fiber.
	Polytetrafluoroethylene (PTFE)		PTFE is an insoluble compound that exhibits a high degree of chemical resistance and a low coefficient of friction. It is sometimes marketed in proprietary classes of materials such as Teflon®, a registered trademark of Dupont Dow Elastomers.
	PTFE / Aramid		A high duty packing for extreme service conditions.
	PTFE / Asbestos		A PTFE / Asbestos yarn.
	PTFE / Graphite		A PTFE / Graphite yarn.
	PTFE / Silk		A PTFE / Silk yarn.
	Ramie		Ramie is another vegetable-based fiber yarn.
	Synthetic		Types of spun synthetic packing can be used as a replacement for asbestos packing.
	Other
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

	Lubrication:		Yarn packings are usually combined with a lubricant. The amount of lubricant required varies with the type of service. A packing used for high-speed rotary motion would normally be of a softer material type to maintain flexibility over time and contain a large amount of lubricant, while a packing used for static applications would not normally contain lubricant.
	Your choices are...
	Graphite		A standard "dry" lubricant that is particularly suitable for steam, water and salt water services. It is often used where the packing would otherwise have to run dry.
	Inert Lubricant		A "wet" lubricant suitable for use with edible products or drinking water.
	Marine Wax		A "wet" lubricant.
	Mica		A standard "dry" lubricant sometimes used as a replacement where the use of graphite would be objectionable.
	Mineral Oil		A "wet" lubricant.
	Molybdenum Disulfide		A standard "dry" lubricant.
	Paraffin		A "wet" lubricant.
	Petrolatum		A "wet" lubricant.
	Petroleum Oils		A "wet" lubricant.
	Polytetrafluoroethylene (PTFE)		A standard "dry" lubricant. PTFE is an insoluble compound that exhibits a high degree of chemical resistance and a low coefficient of friction. It is sometimes marketed in proprietary classes of materials such as Teflon®.
	Silicone		A "wet" lubricant particularly used with asbestos packings for high temperature service. This lubricant is not regarded as suitable for use with edible products or drinking water.
	Tungsten Disulfide		A standard "dry" lubricant.
	Zinc		A standard "dry" lubricant.
	Other
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

Service Limits


	Shaft Speed:		For pumps or rotating machinery applications with slow or infrequent shaft motion, compression packings are required to seal without leaking. Higher speed shaft applications require some fluid leakage for heat dissipation and lubrication, but must be controlled.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Alternate Shaft or Rubbing Speed:		Speed expressed as linear distance per time.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Operating Pressure:		To keep the packing "dry" the radial pressure on the inner ring must be at least equal to the internal pressure. Some leakage past the rings may be desirable.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	pH Range:		The pH range of the fluid to be sealed.
	Search Logic:		User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria.

	Operating Temperature:		This is the full required range of ambient operating temperature.
	Search Logic:		User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria.

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