The slight. 16mm diametrically) is enough to allow two pieces. Boss seal The groove dimensions are incorporated in the standard dimensions. Learn More. An undercut or dovetail groove has proven beneficial in many applications to keep the o-ring in place. Our custom KLICK Dovetail Router Bit is specifically designed to route the groove for the KLICK and sKLICK. O-ring Options for a Nominal Groove. Ph: 859-269-2351. The gland clearance diagram gives a guide to the relation between hardness, pressure, clearance, and extrusion. The angled groove walls are an effective way to retain the seal, because the walls essentially pinch the seal, holding it in position. 070”, . The design is optimized for strength by using an insert pair to generate the groove form. Doing one in a groove that is less than 1/32" wide is extremely challenging. Dovetail joinery is a type of tongue-and-groove (or tail-and-pin) box joint. An undercut or dovetail groove has proven benefi cial in many applications to keep the O-ring in place. Learn More > Contact. An undercut or dovetail groove has proven beneficial in many applications to keep the o-ring in place. O-Ring Design Guides for Engineers. The utility model discloses a kind of ruggedized constructions suitable for dovetail groove, including first substrate and the second substrate, the bottom of the first substrate is provided with tenon, dovetail groove corresponding with tenon is provided in the second substrate, third sliding slot is provided at the center of the dovetail groove inner bottom. Dovetails have the significant benefit of allowing a commercially available O-ring to. Grooves. From the Charpy test, it was observed that the toughness of the T-groove and the dovetail sample is 100% more than the sandwich composite without. O-ring groove design is a key consideration in the o-ring selection process. Dovetail: The O-ring is also axially squeezed in a dovetail groove. In the dovetail groove design, radius r1 never contacts the O-ring – so it does not affect the seal. thick, go with at least a 10° angle. Dovetail grooves are used to hold the O-ring in-place on a face seal groove during during assembly and maintenance of equipment. If the O-ring size required is known, simply select the AS, BS or ISO standard (such as AS568) and enter the dash size reference. Making a dovetail oring groove is an annoying task on a good day at normal size scales. . Static Radial Glans Design Application. Special consideration must be taken for FFKM seals used in the dovetail configurations to ensure squeeze and. View basic o-ring design guides for grooves, glands, depth, width, clearance, stretch, squeeze and more from Marco Rubber O-Ring specialists and buy onlineThis article reviews the underlying principles of using a dovetail groove with an O-ring, and provides original analysis of sealing performance based on a range of. However, this is an expensive groove to machine, and thus should be used only when. The dovetail groove construction is only recommended for O-rings with cross sections of . If you’re applying an o-ring to a face seal, you’ll better not use a face seal o-ring groove design, sometimes referred to as a dovetail. Have a look at the attached sketch. In this region, the major source of stress arising is the rotation of an engine shaft. Do this by taking a chisel and placing it at one end of the base, along the groove, and sliding the guide up to it, then doing the same thing at the opposite end. The guidelines are for the nominal condition. Welcome to the world's. Dovetails & Half Dovetails. 2360 Palumbo Drive. For pressures above 103. 300 in. Once your design is complete, easily order o-rings online from the world’s largest o-ring inventory network. Dovetail grooving inserts are used to machine O-ring dovetail grooves with 66-degree undercut angles. By definition, a dovetail is a tongue and groove that fit tightly together, thus creating an interlocking joint between two pieces which resist being pulled apart in all directions, except one. Then, calculate the O-Ring groove diameter as follows: a. . A solution for retention with an O-ring is to change from a rectangular groove shape to either a Dovetail or a Half Dovetail. Groove designs presented herein are applicable for use with machined or formed metal seals which are similar in configuration to those shown in figure 3, which operate under internal pressure or in vacuum service and which have been specifically qualified or recommended by the purchaser or the manufacturer for use with. Dovetail o-rings come in a wide variety of widths, diameters, cross-sections and corner radii. World Class; Certifications; Contact Us; Call Us: Seal & Design Canada: Toronto, Ontario (416) 741-7005 Toll Free: 1-866-242-3770 Headquarters: Clarence, NY (716) 759-3344 Higbee Division: Syracuse, NYIn the dovetail groove design, radius r1 never contacts the O-ring – so it does not affect the seal. Modifications to. Dividers: You can also use a compass, ruler, or calipers too. Dovetail grooves are used to hold the O-ring in place during installation or maintenance. 832 . Interchangeable with the standard O-ring used in half-dovetail grooves, making seal replacement in the field quick and easy. O-RING DESIGN QUICK REFERENCE This design quick reference guide is intended for use in specifying O-ring and groove dimensions for static applications with pressures less than 1500 psi. Dovetailed grooves are recommended since they hold the gaskets in place and allow the gaskets to expand laterally as they are deflected without constraining the sides. Lip body. · Sharpness and machinability are improved by twisting the blade and doubling the flutes. The O-ring is held firmly in place and has no tendency to drop out of the groove when the chamber is open. Anywhere a maker can mill this groove, a clamp can be added and used. The dovetail was about at the limit of what could be machined easily. Tongue-and-groove joints are popular for making doors, flooring, and architectural paneling. The spiral is wound out of spring temper beryllium copper for excellent spring memory and compression set resistance. for fluids. • For ®the Quad-Rings/X-Rings not listed, the groove dimensions are available upon request. Gland Design Dovetail Grooves Gland Design for a Static Application for O-rings in Dovetail Grooves, METRIC Dovetail grooves are used to hold the O-ring in place during installation or maintenance. . Please contact Greene Tweed engineering for help or advice if required as some applications are difficult to optimize both at ambient and operating temperatures. This type of seal is typically employed in the face (flange) type applications, depicted in Illustration 4. May 1, 2017. . Also known as a wood center mount drawer slide, these sliding dovetails can be made using just your table saw and doesn’t require any sort of #tablesawjig th. Inser. When you pick up the dumbbell, it will not be dragged/carried together. PIP design reduces installation strain or fatigue in high-volume applications. O-Ring inner diameter stretch, outer diameter squeeze. The purpose of this study is to compare the clinical characteristics of the slot and. These charts give dimensional information relating to standard and o-ring and dovetail o-ring grooves. However, this is an expensive groove to machine, and thus should be used only when. Find AS568 o-ring standard sizes by cross section, inside diameter and outside diameter in our o-ring size chart and separate o-ring tolerance chart. • If ®the Quad-Ring/X-Ring swells in the application, the groove width can be enlarged up to 15% max. Face seal o-rings pop out easily, yeah. 125, and . The utility model relates to a forming device for a stainless steel ten-wave dovetail groove type corrugated floor, belonging to the field of machinery and aiming to provide a forming device for a stainless steel ten-wave dovetail type corrugated floor, which can realize one-step formation from plates to a finished product and can be used for processing long. The spiral is tin plated for superior conductivity and shielding properties. The breakthrough dovetail clamp arm design gives you the freedom to create your own track grooves allowing you to clamp virtually anywhere. -With dovetail groove design . Choose whether you are working with existing hardware or designing new hardware. Ace Seal's engineering design guide. See the Dovetail Groove Cutter data sheet for more information (page 36). Secure material with ZERO interference. Designing for interlocking joints. Select the type of O-ring groove - piston, rod, face seal or trapped seal. But the extrusion may also be strong enough to bend a light flange and/or stretch bolts if there are such in your design. Although it mills the same 14 degree, 1/2" profile as a standard dovetail bit, its unique design automatically rounds over the sharp top shoulders creating incredibly clean dovetail grooves and virtually eliminating the need for sanding. Groove. Take the dovetail guide and align it to the groove on the top of the base. RAPiD Design. • Dovetail slides on a lathe. MICROJIG has accomplished this with their MATCHFIT Dovetail Clamp AP. The dovetail groove construction is only recommended for O-rings with bigger cross sections, . The two horizontal axes are the easiest so let's begin there. [Features] ・ It consists of a rack rail and a pinion. For vertical O-ring applications (as a chamber), it is desirable to use an undercut groove similar to that shown in Figure 1. When used as a face seal involving either internal or external pressure, the o-ring should. 이웃추가. Catalog excerpts. For a design problem that cannot be resolved. Machining Centers . . • Encourages the shielding perfor-mance illustrated in the Shielding The dovetail groove described in Design Charts 4-4 and 4-5 will serve this function. We have been very fortunate in the many opportunities we have had to work with dedicated and gifted engineers. The retention feature makes having an upside-down or vertical face seal groove much easi. Spira offers both standard and custom-sized. The contact surface contained reverse-tapered sidewalls. These charts give dimensional information relating to standard and o-ring and dovetail o-ring grooves. Dovetail grooves are a great mechanism for holding O-rings in place. The Computer-Aided Design ("CAD") files and all associated content posted to this website are created, uploaded, managed and owned by third-party users. a lid which opens regularly. This requires looking at the dimensionally largest. Retaining Ring Groove. The tongue is a piece of the wood board that sticks out, and the groove is the space it fits into on the adjacent board. In addition, the present invention provides a closed. Min. For a rod (shaft) seal:O-Ring Max Groove Diameter = Min Shaft Diameter + (2 x Recommended Gland Depth) b. Static applications: stretch the diameter by up to 5% and compress by up to 3%. The tighter the joint is, the higher the friction and the more difficult it will be to pull apart. Download PDF . If this is. It. I have spent a few hours researching and trying things. g. Dovetail The O-ring is also axially squeezed in a dovetail groove. Make the base of the dovetail piece fairly wide, if you can. Many resources are available at your fingertips so don’t miss the opportunity to make the most of them!The dovetail grooving inserts are intended to machine O-ring dovetail grooves with 66-degree undercut angles. Utilizing left/OD and right/ID insert pair to generate groove form, inserts are available in . Standard dovetail-slide sets range from a couple inches to 20 in. O-Ring Compatibility O-ring compatibility information for. For dynamic seals, the upper limit of squeeze. Common examples for where a drop-hole would not be allowed include: In high pressure applications. I think the choice is more manufacturing capability or design preference than case/application driven. 00. Manufactured by Kaiser Tool Company, Thinbit’s Groove ’N Turn toolholders are available in square sizes of ¾" and 1" and are used for making undercuts and thread reliefs at 45-degree angles. Rework can also be reduced, as the seal cannot be installed incorrectly or inadvertentlyDovetail grooves are used to hold the O-ring in place during installation or maintenance. This is an expensive groove to machine, however, and thus should be used only. dovetail or half-dovetail grooves, are encountered but are much less common. Everything To Know About OnePlus. Squeeze % Optimum range of compression is typically 8% to 35%. Dovetail deck profiles are a highly cost effective deck profile, providing excellent strength, even at longer spans. Dynamic Vacuum Sealing There is very little data available on dynamic vacuum seals, but reasonably low leak rates have been reported using two O-rings seals Dovetail grooves are used to hold the O-ring in-place on a face seal groove during during assembly and maintenance of equipment. An undercut or dovetail groove has proven benefi cial in many applications to keep the O-ring in place. AS568A-102 (left). FFKM Markez® O-Rings Material. Design Groove; Design O-Ring; Input O-Ring & Groove; Application info temperature (ºC) info pressure. Gland Design for Static Application for O-rings with Radial Squeeze Industrial Radial Glands INCHES. This groove design is relatively uncommon as it is expensive to machine and should not be used unless absolutely required. To create a retaining-ring groove, click the Retaining Ring Grooves tab. Is the Designer Facing Extinction? Everything To Know About OnePlus. Compare x-ring material compounds and easily order online from the world's largest x-ring inventory network. After machining the "reachable. An undercut or dovetail groove has proven beneficial in many applications to keep the o-ring in place. The O-ring must have room to expand laterally in the groove due to axial compression. Visit our groove design page. There’s a lot to love about the design of MicroJig’s Dovetail Clamp AP. The wall inclination creates a groove with a. On the Mark Two composite 3D printer, for most general purposes, a . 마모가 적다. Tag: dovetail ×. April 19th, 2023. 6Fire. 001" increments. Abstract. Gland width is to sharp edge of groove. Learn More. Volume fill is the O-ring volume divided by the gland volume. Woodworkers use it to. 103" cross section) I typically ran a 20% squeeze, when I had a mechanical advantage for compressing the seal. X-Rings are designed for improved slow dynamic application performance. The name of this design: aluminum plate (dovetail groove). Here is a sketch for that channel cross section. The top is wide and the bottom is smaller, you can easily put the dumbbell back on the dumbbell base. Center the jig appropriately and cut the tails, again following the instructions that accompany your dovetail jig). With a 10x20 cm cross-section that seems like it might be more doable if I'm understanding the. . How to Mill a Dovetail in Fusion 360! Use these easy tips to define a toolpath that navigates semi-tricky dovetail geometry. 812 . Boss seal The groove dimensions are incorporated in the standard dimensions. Manual X-Axis Stages - Dovetail, Rack and Pinion, B05/B06. Ph: 859-269-2351 Fax: 859-335-5128. Sa a se yon Groove chè nan machin, sepandan, e konsa yo ta dwe itilize sèlman. This technique is also known as the upright groove and tenon corner. Static Axial Seals. Some other. The dovetail groove construction is only recommended for O-rings with cross sections of . Surface Finish Static Grooves Straight-sided grooves are best to pre-vent extrusion or nibbling. Solid carbide tool designed for milling dovetail grooves for Sight Attachments, and offered in 50° or 60° included angles. This groove design is relatively uncommon as it is expensive to machine and should not be used unless absolutely required. Good Design Principles. p r o d u c t Typically made from Greene, Tweed’s proprietary perfluoroelastomer compound—Chemraz®—Dovetail Seals ensure stability and cleanliness. Fax: 859-335-5128. O-ring. Choose whether you are working with existing hardware or designing new hardware. DSP Cable Groove; Solid Carbide, 1/8"Ø-1/4"Ø; Solid Carbide, 3/8"Ø-5/8"Ø; Solid Carbide, . Design Chart 4-4: Dovetail Grooves Dovetail Grooves It is often necessary to provide some mechanical means for holding an O-ring in a face seal groove during assembly and maintenance of equipment. We're proud to offer the world's largest inventory of readily-available and highly customized sealing solutions. 1--marcorubber. Quad-Rings®/X-Rings Gland Design Static/Dynamic (INCHES) The following table shows the groove dimensions for Quad-Rings®/ X-Rings. This design is a customised and expensive method that you should only use when necessary and a temporary solution to keep the o-ring in place. This is particularly true when machining O-ring grooves, as this operation requires the tool to drop into the. This section of Seal Design determines if any standard o-rings are available for an existing groove. Here is a diagram showing the effective diameter for a 90 degree V-Bit with a 0. This groove is difficult and expensive to machine, and the tolerances are especially critical. A good spot for the groove is approximately 3/8" from the bottom edge of the. . Clamping freedom that goes beyond the edge; The Match Fit Dovetail Clamps profile fits a 3/8" deep groove made using 1/2" diameter, 14° dovetail router bit. If you are looking for a comprehensive guide on O-Ring design, selection, and application, you should download the Parker O-Ring Handbook (ORD 5700) pdf. The right combination of x-ring material and x-ring groove design will maximize sealing performance life. The insert design is optimized for strength by utilizing a left/OD and right/ID insert pair to generate. 485”. groove shape Ball shaped High stiffness Small deformation capabilities Avoid metal to metal contact (Particle generation) Big influence of geometric tolerances Dovetail shaped Low stiffness Large deformation capabilities Metal to metal contact possible (design measures)DuPont has developed a unique seal design to improve seal life in dovetail grooves. 010″ depth of cut is only 0. Drop-holes are sometimes not permitted in a design due to the added stress concentration point it leaves. NX 1980In this video, we learn about Groove commands of NX. 11:29. The mounting platform is a 1. Dovetail grooves are used to hold the O-ring in-place on a face seal groove during during assembly and maintenance of equipment. Dovetail Cutters-Long Reach. Advantages. For technical assistance with any of. -With dovetail groove design . Review the general o-ring groove design considerations before moving onto the specific o-ring gland design type. Insert sizes are . (Latch, fasteners, etc) Any more, and fitup became problematic. Create your own clamp tracks anywhere you can route. Designed for higher pressure fluid power applications, these O-Ring Face Seal (ORFS) Hydraulic Fittings meet or exceed SAE J1453 and ISO 8434-3 standards. Reasonable design of the cavity shape of the damping hole effectively reduces the leakage rate of the hole-pattern damping seal (HPDS). In radial grooving, the groove is cut perpendicular to the axis of the workpiece, effectively radiating out from the center of a cylindrical part. The tongue is a piece of the wood board that sticks out, and the groove is the space it fits into on the adjacent board. A dovetail joint or simply dovetail is a joinery technique most commonly used in woodworking joinery (carpentry), including furniture, cabinets, [1] log buildings, and traditional timber framing. world design provides improved installation into both straight-wall and dovetail grooves. A static triangular crush seal groove is a simple design and ideal when space is limited and/or wall thickness is too thin for a conventional groove. Expressing these rules as formulas: y = b - D ( 1 + cot 1/2 α ) Home. DOVETAIL O-RING GROOVE DESIGN. Recommended surface finish: 16. → Order a Sample Pack. Cutting the groove for the drawer can be done with a table saw or a router and router table. Geometries including lead angles, top rakes, chip breakers, clearance angles and custom forms can. [3,4] These features of retention range from labial veneering, dovetail preparations and labial and lingual lock and grooves. . Groove Radius. Concerning this, geometry, material selection, and stress calculation need to perform at the predesign phase. Dovetail Groove Designs. There is a weight visualization hole next to the weight adjustment dial, you can quickly see the change of dumbbell weight, which is intuitive and so convenient. O-rings in vacuum sealing. † 309 . Once the sight correctly starts into the groove, use a sight adjustment tool to push the sight into its final centered position. O-Ring inner diameter stretch, outer diameter squeeze. Undersized Cutter Design Allows Climb Milling Both Faces of Groove for Improved Finish. It achieves the same sealing efficiency with either internal or external pressure. 103″. DMS-1684 NC. Dovetail grooving inserts are used to machine O-ring dovetail grooves with 66° undercut angles. Standard O-Ring in half-dovetail groove Seal retention depends on O-Ring compression Trap-Seal™ in half-dovetail groove Secure retention – Trap-Seal™ is tucked under the groove lip Enhancement shapes up to a more secure, leak-free performance. address: 1017 Oliphant Ave, Victoria BC, V8V 2T9. Racetrack Groove Calculation. It's the quickest sliding dovetail joint to make, and adds both visual interest and strength to projects such as display shelving. 005" or . . Dovetail joints are beautiful to look at and strong, plus they are the most difficult joints to execute. 1 degrees is 1/8. Our O-Ring Dovetail. Create dovetail grooves that allow O-rings to flex without falling out of place. This groove can either be extruded, or machined using a special dovetail cutter which is available from Spira. Alternate solutions for creating retention in vertically oriented face seal grooves are: • Dovetail or Half Dovetail • EZ-Lok • Diamond Seals and H-Seals • Friction Fit Spliced Profiles. Do one once as a library feature and you can drag and drop to add them in. Because they can be expensive to machine, O-ring grooves should only be added when necessary or for metric O. Lexington, KY 40509. Surface Finish Static Grooves. by kisolre » Tue Aug 13, 2019 6:51 pm. . Where dangerous or hazardous fluids are being used. Create your vectors with the Dovetails drawn. * Please note that some AS568-0XX O-rings have atypical cross. 4 Common Mistakes in Designing for an O-Ring Axial Face Seal | Hot Topics #37. 500 Major Diameter. Learn about the factors that affect vacuum sealing performance, such as o-ring size, material, groove geometry, surface finish, and lubrication. Create a "master" part with the cut dovetails (brown part). O-Ring Groove design plays an important part in how an o-ring seals. Fluorosilicone O-Rings FVMQ. All the tails are cut into one piece of wood, called here the tail piece. Dovetail grooves are incorporated into a design to help hold the O-ring in place during installation and maintenance. Quick example below (blacked-out part is the O-ring to indicate placement). This figure is based on NBR O-rings with a cross section of . For a rod (shaft) seal:O-Ring Max Groove Diameter = Min Shaft Diameter + (2 x Recommended Gland Depth) b. The dovetail key is a device that spans a natural wood defect or a man-made seam to mechanically lock two pieces together. For bolted flanges or open & close lids. Parker O-Ring Handbook - ORD 5700 pdf. • The first is overfill from high volume caused by a very small gland. Edit the slave part within the. 150" in . Let's assume a knee type milling machine with dovetail ways for all three axes. Learn More. The technical scheme is that：A kind of diskware dovetail groove original position ultrasonic inspection probe, including：Frock 1, probe 2, coupling. Dovetailed grooves are recommended since they hold the gaskets in place and allow the gaskets to expand laterally as they are deflected without constraining the sides. 00E-0,6), f. Since I want to use the same joint on all four corners I copied the lines with the Move tool and placed it at the corner of the box. The angle of orientation usually lies between 60° and 90°. Putting the angled face to the outside renders it useless for retaining the o-ring because the o-rings is pulled towards the straight side by its tension. There are 3 forces to consider when designing interlocking joints: Friction - the critical force that holds the joint together. Half-Blind Dovetail. O-rings used as Boss Seals can withstand much higher application pressures because the threaded hardware mates to eliminate a clearance gap. This can make them challenging designs when it comes to overfill. The designer should be especially conscious of the effects of thermal expansion and chemical compatibility for these high gland fill designs. For designing systems which contain internal pressure, like the example below, the groove's outside diameter (OD) is primary, and the groove's width then determines the inside diameter. Failure mode: gland overfill A dovetail joint or simply dovetail is a joinery technique most commonly used in woodworking joinery (carpentry), including furniture, cabinets, [1] log buildings, and traditional timber framing. In addition, this PIP seal minimizes seal wear on groove corners and removes the parting line from. 7 mm) translation stage that incorporates a dovetail and lead screw translation mechanism for smooth linear positioning along the entire range of travel. Lexington, KY 40509. Dovetail joints are a sign of a true craftsman. A sliding dovetail joint consists of a long groove with angled sides to serve as the tail for the sliding dovetail joint, while a corresponding long pin is cut into the end of the adjoining board. Dovetail grooves help hold orings in place during installation and maintenance and are recommended for O-rings that have a larger cross-section. The EZ-Lok seal is designed specifically to simplify and error-proof the installation process. Dovetail joints require zero mechanical fasteners, making them more attractive to the traditionalist. $ 27. 004" to 0. The top is wide and the bottom is smaller, you can easily put the dumbbell back on the dumbbell base. Dovetail joinery is a type of tongue-and-groove (or tail-and-pin) box joint. O-Ring groove design +. 5M-1994)dimensioning method (again, linear, not. To retain them, you need to dovetail the groove (make it a trapezoid shape). Simply route a groove anywhere you need using a 1/2”–14º dovetail router bit. AIR1108. The MATCHFIT Dovetail Clamp profile fits a 3/8” deep groove made using a 1/2” diameter, 14º dovetail router bit. This groove is not common because it is more expensive to machine, but this dovetail groove can avoid seal extrusion out. Gland Width (G) Gland Depth (L) RadiusThe Apple Rubber Seal Design Guide makes “Seal Thinking™” even more accessible. Dovetail groove cutters are the tool needed to cut a dovetailed groove, recommended for many of Spira’s groove mounted gaskets. info compression (%) Groove info material. Dovetail o-ring groove design is used to prevent o-rings from falling out of the gland. 9E - Dovetail Groove (Fabco, Numatics, Rotomation). Create Device Mockups in Browser with DeviceMock. GROOVE 'N TURN® dovetail grooving inserts are used to machine O-ring dovetail grooves with 66° undercut angles. Harvey Tool's fully stocked selection of O-Ring Slotting End Mills are optimized for machining O-Ring grooves, and feature a stub flute length for improved strength. The DT12 (/M) is a compact, 1/2" (12. . Spira offers both standard and custom-sized. Here is a dovetail joint in action with the Impossible Dovetail Box from Thingiverse. For a bore (piston) seal:O-Ring Min Groove Diameter. The four-lobed design produces a more secure seal to counteract spiral twisting. Two-level optimization predicts designs with the least contact pressure and stress. Depth Of Dovetail: Enter the depth of the dovetail you have created. dovetail Groove Design; Anti-fall & Durable & Quiet; LOYO ADJUSTABLE DUMBBELL . The second component is the mating tail, this is made on the router table using the same 1/2 inch dovetail bit. The rugged polyurethane encapsulated switch features an innovative design that incorporates a hard nylon shell. Create an assembly and mate the brown and beige parts accordingly. 2016. The method used to produce the finish is important. Single flute carbide O-Ring form tools for lathe applications. The dumbbell base is made of ductile iron and has a certain weight. Radial Grooving. Compare x-ring material compounds and easily order online from the world's largest x-ring inventory network. Dovetail O-Ring Groove Design Guide – Basic Recommendations #34. Reset Custom Tolerance. Free groove volume. Polyurethane O-Rings Material. Installation steps This recommended practice provides the design criteria for static elastomeric O-ring seals used specifically in engine and engine control systems.