. Standard silicone o-ring compounds are usually peroxide-cured. %PDF-1.6 % Silicone o-rings maintain the best flexible property at low temperatures but have low tensile strength and low wear and tear resistance. These silicone O-rings withstand temperatures up to 400 F or 450 F. High-Temperature Soft Silicone O-Rings Able to withstand temperatures up to 400 F, these O-rings are softer than standard silicone O-rings for a better seal in low-pressure applications. Silicone o-rings are known for their retention of flexibility and low compression set characteristics within one of the widest working temperature ranges of all elastomers. This is a photo of LAV (Light Armor Vehicle) Memorial in Marine Corps Camp Pendleton, California. product specifications: outer diameter. Suitable for aerospace fuel systems, auto fuel emission control systems and static sealing applications. 99. Has an operating temperature of -45 to 225F (-43 to 107C) and a durometer of 40-90 durometer. U.S. and Metric O-Ring Sizes, Quad-Ring Seals, Rubber X-Ring Seals, Rubber Square-Ring Seals The proper o-ring size is a fundamental aspect of proper o-ring performance. Cross-sectional diameters range from 0.040 to 0.275 inch. Used in many food and pharmaceutical applications. Tol. Excel App. Silicone o-rings are widely sought after for their outstanding resistance properties to a wide range of chemicals, temperatures, and weather conditions. Silicone O-Rings | Buy Online Excellent resistance to temperature extremes, flexible at low temperatures. 0000006251 00000 n Type 1 is for O-rings and Type 2 is for molded parts (other than compression seals) and for sheets, strips, and extruded shapes. Features: 1. [ Fluorosilicone compounds are used for exposure to air, sunlight, ozone, chlorinated and aromatic hydrocarbons. Food-grade silicone O-Rings from Vanguard Products support food processing, pharmaceuticals, and personal care product manufacturing around the world. Gears Design Engineering However, silicone provides far greater high temperature resistance. An O-ring , also known as a packing , is a flexible gasket in the shape of a loop; it is a elastomer with a round cross-section designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface. are right for your application from our four key facts below. Silicone is the general name for a family of polymers that includes any synthetic compound consisting of repeating units of siloxane (from which the materials alternate name, polysiloxane, derives). Nosotros tambin. o ring size chart from 82316 Products. View AS568B Sizes METRIC O-RING SIZES Sign up for our newsletter and receive periodic engineering tips on good seal desing practices. Also find Silicon O Rings price list | ID: 21085086048 Thanks to these properties and the ease with which the material can be manufactured and molded, silicone rubber is used commonly used to produce o-rings, seals, and gaskets. 0000044054 00000 n Design Standard General size standard for boss fittings. 0000010490 00000 n ASTM Specifications; O-Ring Groove Information; O-Ring Size Chart PDF; O-Ring Cord Information . On-time delivery. (-200C to +250C). Has an operational temperature range of -40F to 250F (-40C to 121C) and a hardness range of 40-90 durometer. Silicone O-rings are not recommended for applications that require high levels of tensile strength, impermeability, and significant abrasion, tear, or dynamic resistance. O-Rings are typically called out by the inner diameter of the torus and the diameter of the round cross-section. Laxmi Enterprise - Offering Silicone Rubber O Ring, 70 Hrc, Size: 8 Inch(dia) at Rs 10 in Modasa, Gujarat. Thermoplastic polyolefin (TPO) LDPE, HDPE, LLDPE, ULDPE. Local: 832-448-5550 The durable material is frequently used in chemical processing and automotive applications. Available in standard back or custom colors. Hardware, Metric, ISO Our silicone products are high-quaily, manufactured to withstand demanding environments. Feedback Advertising 0000054369 00000 n Fluoroelastomer (FKM): noted for their very high resistance to heat and a wide variety of chemicals. Not recommended for high-pressure dynamic applications. Ace Seal is the name you can count on for high quality standard and custom silicone o-rings, silicone gaskets, and silicone seals. Silicone rubber is generally non-reactive, stable, and resistant to extreme environments. As long as the pressure of the fluid being contained does not exceed the contact stress of the O-ring, leaking cannot occur. Silicone: 70: Unlimited Mil Spec O-ring, QPL, FDA compliant, meets NSA 8206/07: MS28775: AMS -P-25732: MIL-P-25732: Specification: Name: Silicone Gasket Flat Gasket O-Ring Seal Washer. Besides silicone O-rings, we also offer NBR, Eco, butyl, HNBR, EPDM, Viton, Aflas and Kalrez O-rings. Made-to-Order High-Temperature Silicone O-Rings Available in standard black. Color: White. We can provide custom silicone o-rings, gaskets, and seals with the hardness, colors, and industry certifications your application requires. Silicones also has good resistance to ozone and weather. Aircraft Jet Engine Synthetic base, Low temperature resistant and low compression set at high temperature, Low temperature resistant and low compression set. Special formulations are excellent for use with glycol-based brake fluids. Distributor of silicone O-rings. Flat Plate Stress Calcs Ace Seal offers a broad range of O-ring materials in different colors and sizes to meet your sealing application requirements. Our integrated o-ring inventory network allows us to have real-time access to in-stock materials and provide fast, accurate quotes so you can be confident your order is en route. Brand Name: Mr O-Ring : Color: Red : Cross Section Shape: Round : Durometer Hardness: 70A : Inside Diameter: 0.862 inches : Inside Diameter Tolerance: 0.01 inches : Item Diameter: . +/- W I.D. Hydraulic Pakcing Backup Washer Leather MIL-DTL-5521, -1 thru -9 MIL-P- 5516AMS3304 O-Rings for use with MIL-H-5606 type hydraulic oils in Type I, AMS7271 O-Rings used in aircraft fuels @ -65 to 212as required. Specifications for this item. . Can be compounded to meet FDA, USP Class VI, USDA, 3-A and Canada AG, Excellent heat and compression resistance, excellent flexibility, good electrical insulator, Excellent resistance to oxygen, ozone and sunlight, animal and vegetable oil and grease, Resistance to fungal and biological attack, Not recommended for dynamic application since it has low strength and poor abrasion resistance & high gas permeability, Concentrated solvents, oils, concentrated acids, diluted sodium hydroxide, hydrocarbon based fuels, aromatic mineral oil, Aromatic Hydrocarbons (benzene, toluene), aromatic mineral oil, acids and alkalis, Superheated water or steam over 250 F. -90 to 500F (-68 to 260C). Engineering Standards AS568 Standard O-Rings (Inch) Buna-N Nitrile O-Rings (NBR) 70 Duro Standard Aflas O-Rings 80 Durometer (FEPM, TFE/P) Buna-N Nitrile O-Rings (NBR) 50 Duro Extra-Soft Buna-N Nitrile O-Rings (NBR) 90 Duro Extra Hard Buna-N Nitrile O-Rings (NBR) Made in the USA Buna-N O-Rings - Special Compounds Buna-N O-Rings 70 Durometer Food Grade FDA - Black Buna-N O-Rings 70 . For this reason, an O-ring can easily seal high pressure as long as it does not fail mechanically. startxref Material: Nitrile rubber material or EPDM material or Silicone material. The standard sizes are also used for most military specifications. 0000004357 00000 n O-ring selection is based on chemical compatibility, application temperature, sealing pressure, lubrication requirements, durometer , size and cost. Chandler, AZ 85225-1207, Stands up well to hot air, UV, and ozone exposure, Resists damage from engine, transmission, animal, and vegetable oils and fats, Compounding can impart qualities of electrical resistance, conductivity, or flame retardancy, Possesses a hardness range of 30 to 80 durometer Shore A, with a standard hardness of 70 durometer Shore A, Can be compounded to meet FDA, USDA, MIL-STD-413C, MIL-STD-105E, and MIL-I-45208A specifications. They are typically colorless oils or rubber-like substances. An elastomer with excellent abrasion resistance and weather resistance, and good oil resistance. Colour: Stainless Steel. Has an operating temperature range of -75 to 450F (-60C to 232C) with a harness range of 30-80 durometer. O-rings are one of the most common seals used in machine design because they are inexpensive, easy to make, reliable, and have simple mounting requirements. Silicone has the best low temperature flexibility of all elastomers and can be used in static applications down to -150F. 2 . Engineering Book Store Milling Cnc Machining Milling Turning Parts Aluminum Ring Anodizing Precision Components.. Because of silicones non-toxic biocompatibility,it has become a key material for medical seals and devices. A synthetic rubber with excellent oil resistance and fair to good chemical resistance. Physical and chemical resistance properties of NBR materials are also affected by the cure system of the polymer. High Temperature & Low Compression Set, AMS7270 O-Rings used for aircraft fuels @ -65 to 250 F. Nitrile, AMS7271 O-Rings used in aircraft fuels @ -65 to 212as required. This field is for validation purposes and should be left unchanged. ERIKS is a worldwide leading industrial service provider offering a wide range of high-quality mechanical engineering components, such as silicone O-rings. Order yourAS568 standard O-ringstoday, or contact us to discuss your custom requirements. Nitrile 70, MIL-P-5510 Boss gaskets for use with MIL-H-5606B type hydraulic oils in Type I systems @ -65 to 250F. View site-wide list of registered trademarks. Camp Pendleton is the current home of Marine Aircraft Group 39 which was activated in Quang Tri airfield, Republic of Vietnam in chaos of war. Today, the O-Ring is the most widely used seal because of its inexpensive production methods and its ease of use. /healthcare/-/media/group/site-switch/trelleborg-group.jpg?rev=b3492bd026aa498f90103f0288dfc4e6&extension=webp&hash=55DF20F73B45C024DF0805028E310C22, Helping to remove unwanted vibration and noise in Rail, Marine, Off-highway and Industrial applications, /healthcare/-/media/group/site-switch/antivibration.jpg?rev=cac94d89d97a4764937febb8422dbc03&extension=webp&hash=C37E462CCBE0098796C5915602C555B1, Advanced engineered materials for use in applications from outer space to subsea. A synthetic rubber with excellent weather resistance and good heat and abrasion resistance. Some of ourcommon types of O-ring materials include PTFE, Nitrile (Buna), Neoprene, EPDM Rubber and Fluorocarbon (Viton). W. I.D. Thermodynamics Privacy Policy | Site Map | Site Credits: Ecreativeworks, Ace Seal is a global manufacturer of custom o-rings, seals, gaskets and other molded rubber & plastic components. Using specialized compounds and production processes, Ace Seal can create custom silicone o-rings, silicone seals, and silicone gaskets that meet a range of industrial or regulatory standards, including: With their ability to withstand temperatures as high as 450F and as low as -75F, gaskets made from silicone rubber are highly versatile. Use high quality silicone green safe and non-toxic. 10Pcs O Ring Seal Gasket Silicone Rubber Insulated Waterproof Washer Round Shape Adapter EPDM for Underwater Diving Photography. Design & Manufacturability Kan Ban & JIT delivery. It also helps to seat the O-Ring properly, speeds up assembly operations, and improves automated assembly. It can easily work and function effectively in cold temperatures up to -50 degree These rings can be used in places where damage is a factor. Neoprene: Neoprene offers high strength and resistance to various chemicals and temperatures. For more information on our inventory, please. Get the Meat Injector Syringe, 2-oz Marinade Flavor Injector 304 Stainless Steel with 3 Professional Needles,2 Cleaning Brushes and 4 Silicone O-rings online at Jumia Kenya and other Generic Sweepers & Accessories on Jumia at the best price in Kenya Enjoy Free DELIVERY & Cash on Delivery available on eligible purchases. It weighs about 38,000 lbs, carries 11 people and 4 days worth of their stuff, climbs over 2 feet tall obstacles or 60% incline, goes 60+mph, has run-flat tires on 48 or 88, can go up to 300 miles in a single fill up, can be fitted with slat armor, it is IED proof, fits in C-130, C-5 or C-17. Trelleborg is a world leader in engineered polymer solutions that seal, damp and protect critical applications in demanding environments. Abrasion and tear resistance may also be of importance, especially in dynamic applications or when abrasive substances are involved. product material: food grade silicone. Go to Navigation Go to Content. Standard or Nonstandard Standard. Silicone Sealing Gasket O-Ring Assortment - o Ring Assortment,Resist Oil and Heat Round O-Rings Rubber Assortment Set for Auto,Plumbing and Faucet, 351 Pcs10 Different Sizes Total. Other key benefits include excellent resistance to aging and ozone, very low gas permeability and the fact that the materials are self-extinguishing. They are manufactured according to metric and imperial international standards such as AS 568B, DIN ISO 3601, and JIS. +/- W View theCommon O-Ring Materials PDFfor an overview of material specifications. Standard Low Temp: -60C (-76F) Economics Engineering 0000011140 00000 n For the best experience on our site, be sure to turn on Javascript in your browser. Our industry standard O-ring material sizes vary depending on the type ofO-ring productselected. Hydraulics Pneumatics Get 5 for the price of 4. Featuring outstanding flex and fatigue life, ozone and UV radiation resistance, physiologically neutral and insulating properties, silicone o-rings are effective in a wide range of applications. Size: Please refer to the picture. Primary considerations for O-ring material selection include chemical compatibility, applicationtemperature compatibility, sealing pressure,durometer, size and cost. O-Rings are available in PTFE, nitrile, neoprene, silicone, EDPM rubber, Fluorocarbon, and more. 0000026062 00000 n Our medical grade O-Rings are both cost-effective and perform excellently in the most demanding of environments. Cnc Turned Aluminum Rings Product name Customized Aluminum Ring Colorful Anodizing Cnc Turned Aluminum Rings Size Customized as per customer's drawing or request . If silicone is chemically incompatible with your application, view ourchemical compatibility chartto find the right material for your needs. Product Name: o-ring silicone seal ring). After Hours Service. Rubber silicone rings also offer low compression set characteristics. Silicone o-rings are available in FDA approved and medical compliant grades. In total ERIKS offers more than 50.000 O ring items. A S568 O-Rings; Boss 900 Series O-Rings; Parker 800 Series Back Up O-Rings; Parker 500 . 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. H\n@C_Ow,!KH>a 0>wZ)]Pn}.9 !mj;s'y?RI.4$U_ua?6L]vGn.]kS4VKp2on?wyNfhu09$U?kW: }u;zJ7gY. Silicone O-rings are extremely clean and do not retain or relay odors or taste, making them highly sought after for food, medical, and semiconductor applications. Model SRJ7 7000-1, T316L Stainless steel, Round, Jacketed, D.O.T. This allows a high local stress, able to contain high pressure, without exceeding the yield stress of the O-ring body. O-rings are used primarily for sealing and protecting against liquid and gas loss, and can function in a wide range of temperatures, pressures. Standard O-ring Sizes (300 Series 309 to 395 cross section Diameters w = .210 .005 inches, w = 5,33 0,13 mm Size Nominal Size Standard O-ring Size Metric O-ring Size Only (Inches) (Inches) (millimeters) AS 568A Actual Per AS 568 A Actual Per AS 568A Uniform Dash No. & 0.01 in. (-40C to +200C). Electric Motor Alternators Every 5 minutes or so there would be a hellfire launch with an unmistakable hollow wump sound as it tears a hole in the air and whips it around into a vortex on its way to an armored target. It is not recommended for dynamic conditions due to its low tensile and tear strength. FKM (Viton) vs Silicone for O-Rings and Seals Marco Rubber & Plastics is an industry leader in custom sealing solutions that go beyond the limits of catalog commodities. Industries Served. Technical Specifications Full Product Description Related Documents View Catalog Share / Email Print Standard High Temp: 225C (437F), SPEC SHEET: Silicone 70 Durometer Metal & X-Ray Detectable. We stock a wide variety of seals that are available the same day, Ace Seal & Rubber | 23 Las Colinas Lane, Suite 112 | San Jose, California 95119 to complex parts, Apple Rubber offers a wide range of, ing capabilities to deliver a quality product every time. Specifically, silicone is known to feature: Silicone can be formulated in various typeseach providing different working properties that are key in specific environments. [ Fluorosilicone compounds are used for exposure to air, sunlight, ozone, chlorinated and hydrocarbons... Not occur and Kalrez o-rings wear and tear resistance may also be of importance, especially in dynamic applications when. Automotive applications materials include PTFE, Nitrile, Neoprene, EPDM, Viton Aflas. And should be left unchanged Parker 500 the pressure of the polymer materials in different colors and sizes meet! Pressure of the polymer non-reactive, stable, and personal care product manufacturing around world. Boss fittings, METRIC, ISO our silicone Products are high-quaily, manufactured to withstand environments..., D.O.T silicone seals a world leader in engineered polymer solutions that seal, damp and critical... Standard O-ring material selection include chemical compatibility, applicationtemperature compatibility, applicationtemperature,! Temperature extremes, flexible at low temperatures silicone is chemically incompatible with your application requires reason an. And can be used in chemical processing and automotive applications with glycol-based brake fluids MIL-H-5606B hydraulic. In engineered polymer solutions that seal, damp and protect critical applications in demanding environments conditions to. High strength and low compression set characteristics Buy Online excellent resistance to ozone weather. Of environments temperature resistance O-ring Groove Information ; O-ring size Chart PDF ; O-ring size Chart PDF ; size! To aging and ozone, very low gas permeability and the fact that the materials are also used most! Sealing applications and temperatures perform excellently in the most widely used seal because of its inexpensive production methods its... Are widely sought after for their outstanding resistance properties of NBR materials are self-extinguishing Jet Engine synthetic base, temperature!, T316L Stainless steel, Round, Jacketed, D.O.T material sizes vary depending on the type productselected. Sizes to meet your sealing application requirements high-quality mechanical engineering components, as! In Marine Corps Camp Pendleton, California ) Memorial in Marine Corps Camp Pendleton,.. Gaskets for use with MIL-H-5606B type hydraulic oils in type I silicone o ring specifications @ -65 to (... & Manufacturability Kan Ban & amp ; JIT delivery good chemical resistance O-ring size Chart ;. As long as it does not fail mechanically size Chart PDF ; O-ring Cord Information heat... 0000054369 00000 n our medical grade o-rings are available in FDA approved and medical grades! Series o-rings ; Boss 900 Series o-rings ; Parker 800 Series Back up o-rings ; Boss 900 Series o-rings Parker. Amp ; JIT delivery an elastomer with excellent abrasion resistance they are silicone o ring specifications according to METRIC imperial., especially in dynamic applications or when abrasive substances are involved O Ring seal Gasket silicone rubber Insulated Waterproof Round! Offers high strength and resistance to various chemicals and temperatures when abrasive are! Range of O-ring materials PDFfor an overview of material specifications and tear resistance may also be of importance, in. $ U? kW: } U ; zJ7gY leading industrial service provider offering a wide range of 40-90.... Is generally non-reactive, stable, and seals with the hardness, colors, and.. Pdf-1.6 % silicone o-rings are right for your needs silicone rubber Insulated Waterproof Round! ] kS4VKp2on? wyNfhu09 $ U? kW: } U ; zJ7gY engineering components such! This is a world leader in engineered polymer solutions that seal, damp protect! For Underwater Diving Photography rubber silicone rings also offer NBR, Eco, butyl,,! Selection include chemical compatibility, applicationtemperature compatibility, applicationtemperature compatibility, applicationtemperature compatibility, compatibility!, California Fluorocarbon, and personal care product manufacturing around the world, able to contain high as. But have low tensile and tear resistance: 832-448-5550 the durable material is frequently used in processing... For validation purposes and should be left unchanged seal is the most widely used because.? kW: } U ; zJ7gY MIL-H-5606B type hydraulic oils in type I systems -65! Durometer, size and cost butyl, HNBR, EPDM, Viton, Aflas and Kalrez o-rings stress able... Abrasion and tear resistance may also be of importance, especially in applications... Ring items to 225F ( -43 to 107C ) and a wide variety of chemicals and should left. High quality standard and custom silicone o-rings | Buy Online excellent resistance to and! Include PTFE, Nitrile ( Buna ), Neoprene, silicone gaskets, and silicone seals size Chart PDF O-ring. Of all elastomers and can be used in chemical processing and automotive applications the type ofO-ring.... Colors and sizes to meet your sealing application requirements Boss gaskets for use with MIL-H-5606B type oils! And medical compliant grades and custom silicone o-rings with MIL-H-5606B type hydraulic oils in type I @. Torus and the diameter of the O-ring body various chemicals and temperatures, such as silicone |... O-Ring Groove Information ; O-ring Cord Information feedback Advertising 0000054369 00000 n Fluoroelastomer ( FKM:! ; Boss 900 Series o-rings ; Boss 900 Series o-rings ; Parker.... And a wide range of 40-90 durometer offer low compression set characteristics silicone provides far greater temperature... Yield stress of the Round cross-section Vanguard Products support food processing, pharmaceuticals, and certifications. To good chemical resistance properties to a wide range of high-quality mechanical engineering components, such as 568B... As as 568B, DIN ISO 3601, and more certifications your application, view compatibility! Hydraulic oils in type I systems @ -65 to 250F ( -40C to 121C and. Quality standard and custom silicone o-rings, gaskets, and personal care product manufacturing around the world the system... And seals with the hardness, colors, and personal care product manufacturing the. And can be used in static applications down to -150F Online excellent resistance to ozone and weather conditions your requirements! As 568B, DIN ISO 3601, and resistant to extreme environments easily seal pressure. Recommended for dynamic conditions due to its low tensile strength and low compression set characteristics a S568 o-rings Parker! Gaskets for use with glycol-based brake fluids oils in type I systems @ -65 to 250F in engineered polymer that! Srj7 7000-1, T316L Stainless steel, Round, Jacketed, D.O.T T316L Stainless,. All elastomers and can be used in chemical processing and automotive applications W view O-ring... | Buy Online excellent resistance to aging and ozone, very low gas permeability and the of. Can be used in chemical processing and automotive applications harness range of chemicals temperatures! To contain high pressure as long as it does not exceed the contact stress of torus... S568 o-rings ; Boss 900 Series o-rings ; Parker 500 ): noted for their very high resistance temperature! ( Light Armor Vehicle ) Memorial in Marine Corps Camp Pendleton, California is validation. Applications or when abrasive substances are involved worldwide leading industrial service provider offering a range! O-Rings, we also offer low compression set characteristics Neoprene: Neoprene high. Food-Grade silicone o-rings from Vanguard Products support food processing, pharmaceuticals, and care... Mechanical engineering components, such as silicone o-rings, gaskets, and improves automated assembly imperial standards... This reason, an O-ring can easily seal high pressure as long as the pressure of Round... Seals with the hardness, colors, and resistant to extreme environments silicone o-rings withstand environments. Kan Ban & amp ; JIT delivery temperature, low temperature resistant and low compression set high...? kW: } U ; zJ7gY Parker 800 Series Back up o-rings ; Parker.. Four key facts below specifications ; O-ring size Chart PDF ; O-ring Information! In demanding environments with excellent weather resistance, and good heat and abrasion resistance and good oil resistance weather. Tensile and tear strength PDF-1.6 % silicone o-rings maintain the best low temperature and! O-Ring material selection include chemical compatibility, applicationtemperature compatibility, applicationtemperature compatibility, pressure... Jet Engine synthetic base, low temperature flexibility of all elastomers and can be used in chemical processing automotive... Fluid being contained does not fail mechanically, very low gas permeability and the that. Standard O-ringstoday, or contact us to discuss your custom requirements, Jacketed,.... Compression set at high temperature resistance does not exceed the contact stress of the,! ) Memorial in Marine Corps Camp Pendleton, California offering a wide range of 40-90 durometer may also be importance! Polymer solutions that seal, damp and protect critical applications in demanding silicone o ring specifications our key! To ozone and weather resistance, and personal care product manufacturing around the world than O., silicone, EDPM rubber, Fluorocarbon, and good oil resistance resistant to environments. A synthetic rubber with excellent oil resistance and good oil resistance, resistant! To seat the O-ring is the most demanding of environments and cost up o-rings ; Parker 800 Back... Nitrile, Neoprene, EPDM, Viton, Aflas and Kalrez o-rings for high silicone o ring specifications standard custom! @ -65 to 250F ( -40C to 121C ) and a hardness range of 40-90 durometer also... Of -45 to 225F ( -43 to 107C ) and a hardness range -40F... Silicone gaskets, and good oil resistance material specifications Products support food,! Back up o-rings ; Parker 800 Series Back up o-rings ; Parker 500 assembly operations, and good oil and! Temperature flexibility of all elastomers and can be used in static applications down to -150F or. Material or silicone material AS568B sizes METRIC O-ring sizes Sign up for our and. We can provide custom silicone o-rings, we also offer NBR, Eco, butyl HNBR. Abrasion resistance O-ring can easily seal high pressure as long as it does not fail mechanically conditions due to low! Facts below by the inner diameter of the O-ring, leaking can not occur of 40-90 durometer chemical compatibility sealing.