Compression Packing Seals Specifications

Help with Compression Packing Seals specifications:

Braided Packing Construction


	Cross Section:		Braided or plaited sections can be formed square or round. A lubricant impregnated section can be formed into a square section by passing it through a roller-die.
	Your choices are...
	Square Cross Section		Products have a square-shaped cross section.
	Round Cross Section		Products have a round-shaped cross section.
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	Cross Sectional Size		Most packings are made in a standard range of section sizes from 6 mm (1/4 inch) square upwards.
	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.

	Construction:
	Your choices are...
	Braid-Over-Braid		Braid-over-braid is also called jacket-over-jacket. This design is fabricated by braiding one or more covers over a center core of braided, twisted or homogeneous materials. Products can be braided round, then calendared square. The weave is soft and dense because of the individual jacket-over-jacket construction, and can carry high amount of lubricant.
	Braid-Over-Core		Braid-over-core designs are produced by round-braiding one or more jackets of yarn, rovings, ribbons or other forms of materials over a core that may be extruded, twisted, wrapped or knitted.
	Laminated		With laminated products, either asbestos and rubber or duck and rubber are laminated into slab form and then fabricated into spirals, coils, or rings.
	Multi-Braid or Lattice		With multi-braid or lattice designs, strands are diagonally-braided for greater strength and longer life. Each strand passes diagonally through the body of the packing at an angle of approximately 45°. This design is resistant to permeation leakage and would not be damaged entirely even if the surface becomes worn.
	Plaited		Plaited packings are constructed from interwoven yarns with pockets formed between each plait to retain lubricant.
	Square-Braid		Products with a square cross-section structure are soft and absorbent and can carry a high amount of lubricant. This design is especially suited for high-speed rotary service, particularly at low pressure. Square braid is also called "plaited" by some manufacturers.
	Twisted		With twisted products, yarns or metallic strands are twisted around each other to obtain the desired size. One packing size can be used for various size stuffing boxes. This is primarily a general utility or emergency type of packing where packing space is small.
	Other		Other unlisted, specialty or proprietary braided construction.
	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.

Flexible Graphite Tape


	Thickness
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	Length
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	Width
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Features


	Loose Packing		Loose packings are generally used for sealing pump glands or valves and are easy to fit. They only have to be tapped lightly to pack the gland. Typically, end rings of solid section or split rings of solid packing are used to prevent extrusion of the loose packing.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

	Preformed Ring		Many compression packing materials can be supplied in a pre-compressed ring form. Flexible graphite tape can be supplied as preformed rings.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

	Adhesive Backing		Flexible graphite packings can be supplied with adhesive backing.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

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		Aluminum 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		Carbon yarns are pitch-based and have longer life expectancies than other products. They also have lower 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		Copper 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 is approved by the U.S. Food and Drug Administration (FDA) for use in food processing applications.
	Fiberglass		Glass fibers have excellent thermal properties, dimensional stability, and tensile strength. They will not burn and dissipate heat faster than organic fibers.
	Flax		Flax is provided as long-fiber roving yarns that are braided and impregnated with lubricant.
	GFO®		GFO^® is a registered trademark of WL Gore.
	Graphite		Products are braided from high-purity graphite filaments that 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		Inconel^® is a registered trademark of Inco Alloys International, Inc.
	KYNOL®		KYNOL^® is a registered trademark of American Kynol, Inc.
	Lead		Lead 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		Leather is a traditional packing material used in low-and-medium pressure reciprocating-motion applications.
	PBI®		PBI^® is registered trademark of Celanese Corporation. PBI is an acronym for 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		PTFE / armaid is a heavy-duty packing for extreme service conditions.
	PTFE / Asbestos		PTFE / asbestos yarn.
	PTFE / Graphite		PTFE / graphite yarn.
	PTFE / Silk		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		Other unlisted, specialty or proprietary materials.
	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		Graphite is 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		Inert lubricants are "wet" lubricants suitable for use with edible products or drinking water.
	Marine Wax		Marine wax is a "wet" lubricant.
	Mica		Mica is a standard "dry" lubricant that is sometimes used in place of graphite.
	Mineral Oil		Mineral oil is a "wet" lubricant.
	Molybdenum Disulfide		Molybdenum disulfide is a standard "dry" lubricant.
	Paraffin		Paraffin is a "wet" lubricant.
	Petrolatum		Petrolatum is a "wet" lubricant.
	Petroleum Oils		Petroleum oils are "wet" lubricants.
	Polytetrafluoroethylene (PTFE)		Polytetrafluoroethylene (PTFE) is 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^®, a registered trademark of DuPont.
	Silicone		Silicone is a "wet" lubricant 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		Tungsten disulfide is a standard "dry" lubricant.
	Zinc		Zinc is a standard "dry" lubricant.
	Other		Other unlisted, specialty or proprietary lubrication.
	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.

Specialty Application


	Specialty Application
	Your choices are...
	Pump / Rotating Equipment Packing		Packing seals are designed for pump or rotary equipment applications.
	Valve Packing		Packing seals are designed for valve sealing applications.
	Other Specialty Application		Packing seals are designed for other specialty applications such as soot blowers, food processing, chemical processing, and nuclear applications.
	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		Alternative shaft or rubbing speed is expressed as linear distance per time.
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	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.