And in the unlikely event that none of these suit your requirements, we can develop a specific product for your application. The ptfe orings are popular for use in applications which require a chemically resistant and noncompressible material. Also, the groove width is generally less, as ptfe orings are much less likely to roll in reciprocating applications than their elastomeric counterparts. An o ring is a circular crosssection ring molded from. Where large clearance gaps or higher pressures are necessary, orings are assisted by leather, ptfe, hard rubber, backup or other close clearance antiextrusion devices to prevent extrusion and nibbling. While this specification covers the basic design criteria and recommendations for use with standard size o rings, these glands are also suitable for use with other elastomeric, and polytetrafluoroethylene ptfe based seals. The lack of stretching, and recovery must be considered when designing for ptfe. Gland depth x groove width area of the gland must be larger than the cross section area of the o ring pi x r2. Parker hannifin corporation oring division 2360 palumbo drive, lexington, ky 40509 phone. Global o ring and seal carries a full line of encapsulated o rings in all as568 standard sizes. The extent of extrusion depends upon the hardness of o ring, the pressure, and the size of the clearance gap. An o ring is a simple and versatile ring shaped packing or sealing device. Metric oring groove designs vary greatly and choosing the right one for your application is important for maximum oring performance. Eclipse q seals are unique in that they make use of elastomer contact on both the dynamic and static side of the gland.
An o ring is contained in a gland and forced to flow into the surface imperfections of the glands and any clearance gaps available to it. In this design, the ptfe element acts as a carrier for a rubber quad. Squeeze inches o ring cross section diameter in inches gland depth. Groove design guide for static oring face seals provides default recommendations on width, depth, diameter and more for basic applications. But unlike rubber, this compression set occurs after only one use. Dovetail o ring gland design in dovetail applications the o ring is squeezed primarily in an axial direction, with a valve exerting force on the top and bottom of the o ring sealing surfaces. Both are interlinked, thus ensuring the best possible combination of the. Vulcan seals is a leading manufacturer of feppfa encapsulated o rings and seals globally we have the capacity to produce virtually any crosssection and diameter size or shape of seals, backed by a stock guarantee on the most common items and a short lead time on the rest. Eriks nv oring technical handbook oring gland design. The o ring size should therefore be chosen to suit the nominal diameter rod or bore. Gland depth x groove width area of the gland must be larger than the cross section area of the oring pi x r2. Bunan, viton, or ethylene propylene orings are available. Piston ring set, gold, black, 15 percent glass filled ptfe, buna n, number of pieces 2, durometer 58 shore d, temp range 40 to 4 in bore diameter, ptfe piston ring with nitrile energizer and 70 durometer buna o ring.
Teflon encapsulated oring size and material selection. Parker oring handbook goes digital oring ehandbook. Benefit from a modern user friendly design and be guided from design recommendations from info boxes. Oring, antiextrusion devices billions of orings are used as basic seals for pressures below 1500 psi. Communicate directly with our dedicated team of experienced professionals empowered. An oring can perform sealing by means of squeeze under low pressure conditions.
This metric o ring groove design reference guide will help you find the right radius, backup, pressure and other o ring dimensions for basic applications. Choosing the properly encapsulated o ring will largely depend on the specific needs of the application. We design and manufacture custom shapes and develop specialty materials to deliver a performance advantage. By simply entering installation specifications for an application, it recommends o ring sizes, housing layout and corresponding part. More information, including design criteria on oring drive belts and their application will be found in oring applications, section iii. Easy to use pdf output saving of your designs easy search for eriks standard orings visit. Since its initial release in 1957, the parker oring handbook has become a.
Parker recommends utilizing ourdesign tools mobile inphorm and the oring selector design software to guide the user through the design and selection of an oringand corresponding seal gland. Choose between more than 30 groove materials and 11 oring compounds. Metric o ring groove designs vary greatly and choosing the right one for your application is important for maximum o ring performance. Grooves for ptfe o rings are similar to those for rubber o rings, except that less squeeze is applied, due to the relative stiffness of the material. Having a circular cross section that functions as a seal, in both static and. Air logic plastic needle valves screwdriver slot adjustment or knurled knobs. More often, ptfe o rings are found in flange gasket type applications where the seal will remain static and undisturbed until the next service interval. The teflon shell offers excellent chemical and temperature resistance while the steel spring core provides the resiliency needed to provide effective cryogenic seal performance down 420 o f. For background information, see orings orings are available in five different materials from scientific instrument services. We design and manufacture custom shapes and develop. Oring sizes have been standardized and range in size from an inside diameter of 0.
Our o ring groove design guides list default o ring groove dimensions for the most basic applications and are intended to be used with the following o ring groove design considerations to engineer an o ring gland to optimize specific application performance. Trelleborg sealing solutions offers you everything from the versatile elastomer oring to complex multifaceted ptfe based and polyurethane geometries. The right encapsulated o ring is applicationspecific. The combination of stresses that act on o rings can be complex and difficult to evaluate. As568b standard oring groove design contact us for assistance or samples the three main types of standard groove designs are industrial static also called radial, industrial. Nearly all custom size o rings, washers, square rings, and xrings in almost every material are supplied without tooling fees. Parker oring handbook 5700 handbook introduction 12 seals build with the best. Take the guesswork out of oring design and selection with mobile inphorm. As568b standard o ring groove design contact us for assistance or samples the three main types of standard groove designs are industrial static also called radial, industrial reciprocating also called dynamic, and face seals also called axial or flange. Ptfe is the chemically inert of the oring materials. An oring is contained in a gland and forced to flow into the surface imperfections of the glands and any clearance gaps available to it. The wrong size groove makes the best o ring underperform. Incompatibility of the o ring elastomer and its environment. Suggested groove design for ptfe orings all seals inc.
The ptfe orings for use in applications which require a chemically resistant and noncompressible material. Take the guesswork out of o ring design and selection with mobile inphorm. Made of polytetrafluoroethylene ptfe for use with a variety of chemicals, fluids, and gases round in shape to provide a seal between cylindrical overlapping surfaces can be used across. The ptfe yarns are further vacuum impregnated with ptfe dispersion to enable the packing to handle steam and gas services as well as liquids. Orings are made using a wide variety of materials including viton, fkm, ffkm, aflas, epdm, silicon, ptfe, nitirle, bunan kalrez and other materials including fep encapsulated o.
Made of polytetrafluoroethylene ptfe for use with a variety of chemicals, fluids, and gases round in shape to provide a seal between cylindrical overlapping surfaces can be used across a wide temperature range from 328 degrees f 200 degrees c to 500 degrees f 260 degrees c. Few elastomeric materials will handle 20,000 psi at 450f. Ptfe orings teflon buy online eastern seals uk ltd. The extent of extrusion depends upon the hardness of oring, the pressure, and the size of the clearance gap. Jun 16, 2016 for more than 50 years, the parker oring handbook has been an engineering staple of the sealing industry. Because ptfe o rings are basically a plastic o ring, they perform differently from elastomeric o rings.
Oring design, static seal designs and gland dimensions. Ptfe backup washers oring design and gland dimensions. Both are interlinked, thus ensuring the best possible combination of the calculated oring size and material choice. Ptfe o rings are used for a wide range of applications in many industries, including aerospace, food and drink, pharmaceuticals, telecommunications and semicon. Oring gland design dovetail seal also here there is a metal to metal contact as long as the construction will not deform under system pressure. Dovetail oring gland design in dovetail applications the oring is squeezed primarily in an axial direction, with a valve exerting force on the top and bottom of the oring sealing surfaces. Size is relative and since you did not provide any details about the application no suggestions can be made. Ptfe o rings are used where many other materials and elastomers are unsuitable for the application conditions, i. Oring face seals are used in a variety of applications, including bolted flanges or removable lids. Male gland female gland 12 e o ring gland design for eciprocating seals w i. Our oring groove design guides list default oring groove dimensions for the most basic applications and are intended to be used with the following oring groove design.
A reused ptfe o ring may look and perform similarly to a standard rubber o ring suffering from extreme compression set. The online o ring calculator offers engineers and professionals a quick and easy way to calculate o ring dimensions and the appropriate housing layout in accordance with the international o ring standard iso 3601. Dovetail glands are used in static or slow moving dynamic applications, and require strict tolerances that are difficult to control. Teflon ptfe products custom diaphragms sanitary gaskets emi shielding rubber products rubber extrusions cord stock sheet stock thread seals lubricants adhesives plastic injection molded parts packings permaglyde friction reduction valueadded services. The round ring will become almost square causing wear to the gland and the oring when going from 0 to 20,000 psi. Teflon o rings are known for high heat resistance, high resistance to chemical agents and solvents, antiadh. The seal assembly consists of an elastomer o ring and a gland. Over the past 50 years weve developed a portfolio of seals and. Also, the groove width is generally less, as ptfe o rings are much less likely to roll in reciprocating applications than their elastomeric counterparts. This sae aerospace standard as provides standardized gland groove design criteria and dimensions for elastomeric seal glands for static and dynamic applications. The oring selector covers both imperial and metric standards. In 2015, parker hannifin corporation launched an interactive digital reference guide to enhance and broaden the customer reach of the existing parker oring handbook, the parker oring ehandbook.
An o ring can perform sealing by means of squeeze under low pressure conditions. An oring is a simple and versatile ring shaped packing or sealing device. It is very important that both the o ring compound and size be tested in an environment that represents service. Design dimensions for oring installation orings are normally used as seals in several ways, and dimensions of the groove or gland will also vary with the cross section of the ring. Installation in axial, easily accessible or radial split grooves is preferred. A reused ptfe oring may look and perform similarly to a standard rubber oring suffering from extreme compression set. Nearly all custom size orings, washers, square rings, and xrings in almost every material are supplied without tooling fees. Orings characteristics ptfe orings and flexible graphite. This book contains extensive information about the properties of basic sealing elastomers, as well as examples of typical oring applications, fundamentals of static and dynamic seal design and oring failure modes. The plug diameter h must be figured using the minimum clearance gap as given in figure 20 and the maximum clearance gap as shown in figure 22.
Polytetrafluoroethylene ptfe is a high molecular weight polymer, one of the most versatile plastic materials known and useful for a large range of products for applications excluded to other materials. More information, including design criteria on o ring drive belts and their application will be found in o ring applications, section iii. Simple selection tool to easily order online today. The online oring calculator offers engineers and professionals a quick and easy way to calculate oring dimensions and the appropriate housing layout in accordance with the international o.
Orings for straight thread tube fitting bosses all seals. Teflon orings,polytetrafluoroethylene ptfe is used wherever the chemical and thermal resistance of the elastomer orings is no longer sufficient. This sae aerospace standard as provides standardized gland groove design criteria and dimensions for oring seal glands for static and dynamic applications, and other seals. This web based mobile app offers material recommendations, fluid compatibility, and glandseal calculations. Having a circular cross section that functions as a seal, in both static and dynamic applications, by being compressed between the mating surfaces comprising the walls of the gland, in which it is installed. For more than 50 years, the parker oring handbook has been an engineering staple of the sealing industry. Otherwise many bad things will happen to your design.
This web based mobile app offers material recommendations, fluid compatibility, and gland seal calculations standard sizing design analysis. In some applications an encapsulated fep o ring may be a better solution then a ptfe o ring, due to its better recovery rate. Global oring and seals encapsulated viton and silicone orings. Grooves for ptfe orings are similar to those for rubber orings, except that less squeeze is applied, due to the relative stiffness of the material. Make sure the squeeze % is sufficiently high enough to seal, but low enough to allow dynamic movements. Ptfe teflon orings ptfe teflon oring material description polytetrafluoroethylene ptfe is a high molecular weight polymer, one of the most versatile plastic materials known and useful.
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