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. Since its initial release in 1957, the parker oring handbook has become a. Air logic plastic needle valves screwdriver slot adjustment or knurled knobs. The ptfe yarns are further vacuum impregnated with ptfe dispersion to enable the packing to handle steam and gas services as well as liquids. Oring with a fep teflon outer layer encapsulating stainless steel spring.
In some applications an encapsulated fep o ring may be a better solution then a ptfe o ring, due to its better recovery rate. Also, the groove width is generally less, as ptfe orings are much less likely to roll in reciprocating applications than their elastomeric counterparts. Over the past 50 years weve developed a portfolio of seals and. Manufactured from pure ptfe in the form of fine multifilament yarns. Both are interlinked, thus ensuring the best possible combination of the calculated oring size and material choice. 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. Oring design, static seal designs and gland dimensions. More information, including design criteria on oring drive belts and their application will be found in oring applications, section iii. This web based mobile app offers material recommendations, fluid compatibility, and gland seal calculations standard sizing design analysis. 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.
It is very important that both the o ring compound and size be tested in an environment that represents service. Squeeze inches o ring cross section diameter in inches gland depth. Ptfe o rings are used where many other materials and elastomers are unsuitable for the application conditions, i. Few elastomeric materials will handle 20,000 psi at 450f. 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. And in the unlikely event that none of these suit your requirements, we can develop a specific product for your application. The ptfe orings for use in applications which require a chemically resistant and noncompressible material. For more than 50 years, the parker oring handbook has been an engineering staple of the sealing industry. 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.
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. Benefit from a modern user friendly design and be guided from design recommendations from info boxes. Orings characteristics ptfe orings and flexible graphite. An o ring can perform sealing by means of squeeze under low pressure conditions. Male gland female gland 12 e o ring gland design for eciprocating seals w i.
Dovetail glands are used in static or slow moving dynamic applications, and require strict tolerances that are difficult to control. Readily available in usa and metric crosssections and nearly unlimited. This web based mobile app offers material recommendations, fluid compatibility, and glandseal calculations. Eclipse q seals are unique in that they make use of elastomer contact on both the dynamic and static side of the gland.
Ptfe orings teflon buy online eastern seals uk ltd. We design and manufacture custom shapes and develop specialty materials to deliver a performance advantage. Take the guesswork out of oring design and selection with mobile inphorm. 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 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. Teflon encapsulated oring size and material selection. Size is relative and since you did not provide any details about the application no suggestions can be made. A reused ptfe oring may look and perform similarly to a standard rubber oring suffering from extreme compression set. An oring is a simple and versatile ring shaped packing or sealing device. Oring sizes have been standardized and range in size from an inside diameter of 0.
This sae aerospace standard as provides standardized gland groove design criteria and dimensions for elastomeric seal glands for static and dynamic applications. Metric o ring groove designs vary greatly and choosing the right one for your application is important for maximum o ring performance. 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. We design and manufacture custom shapes and develop. Ptfe backup washers oring design and gland dimensions. 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. Having a circular cross section that functions as a seal, in both static and. Make sure the squeeze % is sufficiently high enough to seal, but low enough to allow dynamic movements. Suggested groove design for ptfe orings all seals inc. Gland depth x groove width area of the gland must be larger than the cross section area of the oring pi x r2. Parker oring handbook 5700 handbook introduction 12 seals build with the best. 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. 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.
More information, including design criteria on o ring drive belts and their application will be found in o ring applications, section iii. The right encapsulated o ring is applicationspecific. Gland depth x groove width area of the gland must be larger than the cross section area of the o ring pi x r2. The lack of stretching, and recovery must be considered when designing for ptfe. Take the guesswork out of o ring design and selection with mobile inphorm. Simple selection tool to easily order online today. But unlike rubber, this compression set occurs after only one use. Because ptfe o rings are basically a plastic o ring, they perform differently from elastomeric o rings. A reused ptfe o ring may look and perform similarly to a standard rubber o ring suffering from extreme compression set. 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. Ptfe is the chemically inert of the oring materials. Groove design guide for static oring face seals provides default recommendations on width, depth, diameter and more for basic applications.
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. Global oring and seals encapsulated viton and silicone orings. Ptfe polytetrafluoroethylene aka teflon orings polytetrafluoroethylene ptfe orings. The o ring size should therefore be chosen to suit the nominal diameter rod or bore. Orings for straight thread tube fitting bosses all seals. 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. The oring selector covers both imperial and metric standards. Installation in axial, easily accessible or radial split grooves is preferred. Both are interlinked, thus ensuring the best possible combination of the.
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. Excentricity info inner diameter stretch at inst % inner diameter mm. Ptfe o rings are used for a wide range of applications in many industries, including aerospace, food and drink, pharmaceuticals, telecommunications and semicon. By simply entering installation specifications for an application, it recommends o ring sizes, housing layout and corresponding part. 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. 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. Teflon o rings are known for high heat resistance, high resistance to chemical agents and solvents, antiadh. In this design, the ptfe element acts as a carrier for a rubber quad. Oring, antiextrusion devices billions of orings are used as basic seals for pressures below 1500 psi. 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. An o ring is a circular crosssection ring molded from.
Teflon orings,polytetrafluoroethylene ptfe is used wherever the chemical and thermal resistance of the elastomer orings is no longer sufficient. Oring face seals are used in a variety of applications, including bolted flanges or removable lids. The extent of extrusion depends upon the hardness of o ring, the pressure, and the size of the clearance gap. Otherwise many bad things will happen to your design. Metric oring groove designs vary greatly and choosing the right one for your application is important for maximum oring performance. For background information, see orings orings are available in five different materials from scientific instrument services. Trelleborg sealing solutions offers you everything from the versatile elastomer oring to complex multifaceted ptfe based and polyurethane geometries. Choose between more than 30 groove materials and 11 oring compounds. The combination of stresses that act on o rings can be complex and difficult to evaluate. 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. 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.
Incompatibility of the o ring elastomer and its environment. Also, the groove width is generally less, as ptfe o rings are much less likely to roll in reciprocating applications than their elastomeric counterparts. The extent of extrusion depends upon the hardness of oring, the pressure, and the size of the clearance gap. 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. Nearly all custom size orings, washers, square rings, and xrings in almost every material are supplied without tooling fees.
Global o ring and seal carries a full line of encapsulated o rings in all as568 standard sizes. 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. 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. 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. An o ring seal is used to prevent the loss of a fluid or gas. Eriks nv oring technical handbook oring gland design.
Communicate directly with our dedicated team of experienced professionals empowered. 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 wrong size groove makes the best o ring underperform. 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. 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. The seal assembly consists of an elastomer o ring and a gland. An oring can perform sealing by means of squeeze under low pressure conditions. 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. 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. Jun 16, 2016 for more than 50 years, the parker oring handbook has been an engineering staple of the sealing industry. Parker oring handbook goes digital oring ehandbook. The ptfe orings are popular for use in applications which require a chemically resistant and noncompressible material.
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. Vulcan seals is a leading manufacturer of feppfa encapsulated o rings and seals globally we have the capacity to produce virtually any cross. An o ring is a simple and versatile ring shaped packing or sealing device. The round ring will become almost square causing wear to the gland and the oring when going from 0 to 20,000 psi. Choosing the properly encapsulated o ring will largely depend on the specific needs of the application. Parker hannifin corporation oring division 2360 palumbo drive, lexington, ky 40509 phone. Easy to use pdf output saving of your designs easy search for eriks standard orings visit. Nearly all custom size o rings, washers, square rings, and xrings in almost every material are supplied without tooling fees.
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