Piston seals are radial seals. The seal is fit onto a shaft with the sealing lip contacting the housing bore. V-rings are considered external lip seals.
An axial seal seals axially against a housing or machine component.
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.
Also called flexible lip, radial lip, or rotary shaft seals. Oil & grease seals are used to retain or separate lubricants or fluids. These seals are primarily used for rotary applications only.
Also called U-packings or Block Vee packings. Depending on their construction, U-rings and block vee rings can be used as a rod seal, a piston seal or a symmetric seal. U-rings and block vee rings are single acting, or unidirectional seals, and must be mounted back-to-back in double-acting cylinder applications. A Block Vee seal is more compact and has better performance characteristics under high pressure than a U-ring.
V-ring seals are all rubber seals used primarily to exclude dirt and other contaminants. V-rings stretch over a shaft and seal against the side of a housing or other machine component.
There are many different styles of clearance, or labyrinth seals. The one thing they all have in common is that they all operate on a principle of positive clearance (i.e., no rubbing against the shaft or housing). Many labyrinth seals are comprised of a rotor (rotating) and stator (stationary) member with a radial gap between the two members. The gap must be larger than the radial clearance of the bearing being sealed. In addition, the operating speed and temperature must be considered when using a labyrinth seal. These seals generally do not perform well at low operating speeds. Another form of labyrinth seal is a laminar sealing ring, which uses a series of flat metal washer-like rings of varying diameters to create a labyrinth seal.
Bearing isolators are dynamic seals designed to protect bearings from outside contaminants. They are comprised of a rotor (rotating) and stator (stationary) member. Some bearing isolators are of labyrinth construction while others use O-rings or other positive seals.
Unlisted, specialized, or proprietary configuration.
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.
Seal has a single metal outer shell or band. Metal cased seals are often coated with rubber. Also referred to as metal clad. Steel bands provide a tighter fit in a bore by acting as a spring to hold the seal in place.
Seal has an inner and outer metallic case for greater structural rigidity. Metal cased seals are often coated with rubber. Also referred to as having an inner case, which implies that it also has an outer case.
Seal is of all rubber or polymer construction and does not have a metal case. Seal may have a garter spring, however. Elastomers and thermoplastics are polymers. An elastomer is a polymer that has the elastic properties of natural rubber. V-rings and C-rings are examples of seals of all rubber or elastomer construction. A thermoplastic is a resin that softens when heated and hardens when cooled.
Other unlisted, specialized, or proprietary configuration.
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.
Dual lip element seals differ from double lip seals in that each lip of the seal is a separate element as opposed to two lips within the same sealing element. Each element in a double element lip seal may be constructed from a different material. In opposed seal elements, the two seal lips point in opposite directions. These seals are used to separate two different fluids.
Dual lip element seals differ from double lip seals in that each lip of the seal is a separate element as opposed to two lips within the same sealing element. Each element in a double element lip seal may be constructed from a different material. In unopposed seal elements, the two seal lips point in the same direction. These seals are used where it is desirable to have a back-up seal incorporated into one seal case or shell.
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.
This dimension refers to the radial cross section of the seal. This dimension is commonly used for seals such as V-rings, back-up rings, piston rings, and pipe seals.
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.
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.
Sealing Element or Lip Material
Many seal manufacturers use their own proprietary material. Where possible, these materials have been categorized into the generic equivalent or material family. Consult with manufacturer for proprietary material specifications.
A polymer is a solid, nonmetallic compound of high molecular weight the structure of which is composed of small repeat units (mers). Plastics and elastomers are polymers.
Ethylene acrylic compounds provide high-heat aging resistance while providing good physical properties. They offer a high degree of oil, ozone, UV, and weather resistance along with good low temperature flexibility. Suggested operating temperature (-20° to 300° F). Manufactured under the trade name Vamac® by DuPont Dow Elastomers.
Good resistance to sunlight, weathering and ozone. It has poor resistance to petroleum oils and fuel. Good heat and compression set resistance. Suggested operating temperature (-70° to 275° F). Trade names include Nordel® (DuPont Dow Elastomers), Vistalon® (ExxonMobil Chemical), Epsyn® (DSM Elastomers), Royalene® (Uniroyal Chemical), and Epcar® (B.F. Goodrich).
A range of fluoropolymer elastomers whose formulation can be tailored to a reasonable extent to meet the needs of individual end-uses. They are normally black and have high heat, oil and chemical resistance but indifferent low temperature performance. With the exception of Kalrez® perfluorinated elastomer, they are about the most highly temperature resistant of all commercially available elastomers. Trade names include Viton® (DuPont Dow Elastomers), Fluorel® & AflasTM (3M Corporation), and Technoflon® (Montedison).
The mechanical and physical properties are very similar to silicone. However, Flourosilicone offers improved fuel and mineral oil resistance but poor hot-air resistance in comparison. Suggested operating temperature (-100° to 350° F). Trade names include FSE® (General Electric Co.), Silastic® (Dow Chemical), and Sylon® (3M Corporation).
Good resistance to petroleum hydrocarbons and fuels. Widely used with most oils, hydraulic fluids, and alcohol. Many compound variations are available for specific applications. Suggested operating temperature (-30° to 275° F). Trade names include Breon® (BP Chemicals), Chemigum® (Goodyear), Hycar® (B F Goodrich), Krynac® (Polysar Ltd.), Nipol® (Zeon Chemicals), Nysyn® NBR, (DSM Elastomers), Paracril® (Uniroyal Chemical), and Perbunan® (Mobay).
Nitrile has good mechanical properties when compared with other elastomers and high wear resistance. Nitrile is not resistant to weathering and ozone. Suggested operating temperatures from (-40° to 300° F). Trade names include Therban® (Mobay), Tornac® (Polysar), and Zetpol® (Nippon Zeon Company).
Polyacrylate elastomers are well suited for use with extreme pressure (EP) lubricants and have high resistance to oxidation and ozone. Polyacrylates are not recommended for dry running applications. Suggested operating temperature (-25° to 350° F). Trade Names Include Cyanacryl® (American Cyanamid), HyTemp® (BF Goodrich), and Thiacril® (Uniroyal).
A synthetic rubber that resists degradation from sun, ozone, and weather. It performs well in contact with oils and many chemicals. Neoprene remains useful over a wide temperature range, displays outstanding physical toughness, and resists burning inherently better than exclusively hydrocarbon rubbers. Neoprene also offers resistance to damage caused by flexing and twisting. Suggested operating temperature (-45° to 230° F). Trade names include Neoprene (DuPont Dow), Baypren® (Mobay), and Butachlor® (Ditsugil).
PEEK is a high temperature resistant engineered thermoplastic. It has excellent chemical and fatigue resistance, and thermal stability. PEEK has superior chemical resistance, is inert to all common solvents and resists a wide range of organic and inorganic liquids. PEEK has a maximum continuous working temperature of 480°F and retains its mechanical properties up to 570°F in steam or high-pressure applications.
Acetal polymers are semi-crystalline. They offer excellent inherent lubricity, fatigue resistance, and chemical resistance. Acetals suffer from outgassing problems at elevated temperatures, and are brittle at low temperatures. Glass filled, and added lubrication grades are available, flame-retardant grades are not. Brand names include: Celcon (Hoechst Celanese), Delrin (DuPont), Thermocomp (LNP), Ultraform (BASF).
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.
Polyurethane is a diverse class of materials exhibiting good elongation, recovery and toughness properties. They are flexible and have good abrasion resistance. (NOTE: The urethanes of the plastics industry are so named because the repeating units of their structures resemble the chemical urethane.) Trade names include Texin® (Bayer), Adiprene® and Vibrathane® (Uniroyal Chemical), Estane® (B F Goodrich), Genthane® (General Tire and Rubber), Millathane®, and Pellethane® (Dow Chemical).
Natural compounds such as gum rubber (polyisoprene) and latex.
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.
Sintered bronze is a porous material, which can be impregnated with oil, graphite or PTFE. Not suitable for heavily loaded applications but useful where lubrication is inconvenient.
The term "cast iron" refers not to a single material, but to a family of materials whose major constituent is iron, with important trace amounts of carbon and silicon. Cast irons are natural composite materials whose properties are determined by their microstructures - the stable and metastable phases formed during solidification or subsequent heat treatment. The major microstructural constituents of cast irons are: the chemical and morphological forms taken by carbon, and the continuous metal matrix in which the carbon and/or carbide are dispersed.
Stainless steel is chemical and corrosion resistant and can have relatively high pressure ratings.
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.
Felt seals are primarily used with heavy lubricants and for the exclusion of dirt. The operating temperature range for felt is -65° to 200°F (-54° to 93°C).
The characteristics of leather include flexibility, toughness and resistance to abrasion. It is composed of high-strength interlocking fibers. There are two main advantages to using leather as a sealing material, its ability to absorb and retain lubricants and its effectiveness sealing against rough surfaces.
Other unlisted, specialized, or proprietary material.
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.
The seal also has a wiper or scraper (exclusion) element in addition to primary seal. Frequently an oil or hydraulic seal will also have a wiper or scraper element to keep contaminants from the sealing area.
Search Logic:
"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
