Model Sealed
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| TAMIYA 35109 MILITARY MINIATURES GERMAN SOLDIERS SEATED 1 35 MODEL NEW SEALED | |
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$15.00 Time Remaining: 7d 13h 40m Buy It Now for only: $15.00 |
| 1996 IHC Disney Toy Story Express HO Model Train Set Sealed COA 000085 LTD ED | |
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$99.99 Time Remaining: 37m |
| AMT FOXY BOX Chevy Custom Van Very Rare 1 25 scale model STILL SEALED | |
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$36.53 (2 Bids) Time Remaining: 1h 13m |
| AMT DISCO VAN Ford Custom Very Rare 1 25 scale model STILL SEALED | |
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$50.00 (1 Bid) Time Remaining: 1h 52m |
| The Flying Sub Voyage to the Bottom of the Sea Model Kit Moebius SEALED NIB 101 | |
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$15.99 Time Remaining: 23d 16h 22m Buy It Now for only: $15.99 |
| AMT ERTL Dick Tracy 1 25 Model Kit 1936 Ford 5 Window Coupe 6107 SEALED 1990 | |
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$8.00 Time Remaining: 3h 22m Buy It Now for only: $14.99 |
| MPC ERTL DEORA Show Car 1 25 Model Kit SEALED 2005 Nostalgic Series | |
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$8.00 (1 Bid) Time Remaining: 3h 30m |
| AMT 1 25 Lil Stogie Draggin Wagon Plastic Model Kit Factory Sealed Box | |
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$10.99 Time Remaining: 27d 11h 9m Buy It Now for only: $10.99 |
| Matchbox Henschel Hs126 Military Model Airplane Sealed 1 72 Scale | |
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$5.99 Time Remaining: 6h 15m |
| 1991 AMT Star Trek Special Edition USS Enterprise Chrome Set Model 6005 SEALED | |
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$9.95 Time Remaining: 7h 18m Buy It Now for only: $24.98 |
| AMT 1 25 Dirty Donny Vantasy Chevy Van Plastic Model Kit Factory Sealed Box | |
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$18.79 Time Remaining: 29d 8h 30m Buy It Now for only: $18.79 |
| McLaren GRAND PRIX TURBO 1 25 scale 1989 Revell model car SEALED kit PONTIAC GP | |
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$22.99 Time Remaining: 7h 33m Buy It Now for only: $26.49 |
| MONTE CARLO SS model car kit 1 24 Monogram 1986 Chevy Super Sport in SEALED BOX | |
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$19.29 (2 Bids) Time Remaining: 7h 36m |
| 1953 Ford Convertible Indy Pace Car 1 25 Scale Model 72321 NEW SEALED | |
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$5.49 Time Remaining: 17d 8h 30m Buy It Now for only: $5.49 |
| AMT ERTL Star Wars Darth Vader Vinyl Model Kit New Sealed in Box | |
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$9.99 (1 Bid) Time Remaining: 7h 39m |
| 1963 CHEVY IMPALA SS 409 125 AMT Prestige Series model car kit sealed parts | |
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$14.99 Time Remaining: 7h 40m |
| BUICK Grand National model car kit 124 scale Monogram SEALED PARTS vintage 1988 | |
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$14.99 Time Remaining: 7h 45m |
| VINTAGE AMT ERTL FORD PICK UP 40 FORD DIAMOND IN THE ROUGH MODEL KIT SEALED | |
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$39.99 Time Remaining: 29d 16h 48m Buy It Now for only: $39.99 |
| Mitsubishi Galant VR 4 model car kit Hasegawa 124 scale SEALED BOX rare import | |
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$42.49 Time Remaining: 7h 51m |
| Sealed MATCHBOX Model Kit Focke Wulf Ta 154 Plane | |
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$5.50 (1 Bid) Time Remaining: 8h |
| PIASECKI ZV 8P AIRGEEP GLENCOE 1 35 MODEL 1990 NEW SEALED | |
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$14.99 Time Remaining: 29d 12h 41m Buy It Now for only: $14.99 |
| Sealed REVELL Junkers G 24 2Bauserie Model Kit 172 Scale | |
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$9.90 (5 Bids) Time Remaining: 8h 17m |
| Sealed AIRFIX English Civil War Collection 54mm Model Kit | |
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$36.15 (7 Bids) Time Remaining: 9h 1m |
| 1948 Lincoln Continental Lindberg 1 25 Scale Model 72322 NEW SEALED | |
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$5.49 Time Remaining: 24d 13h 11m Buy It Now for only: $5.49 |
| Aurora Polar Lights Bellringer Hunchback Monster Model Sealed | |
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$29.99 Time Remaining: 9h 5m Buy It Now for only: $32.99 |
| Star Wars X Wing Fighter SNAPFAST Model Kit Brand New Factory Sealed AMT Hobby | |
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$15.95 Time Remaining: 9h 8m Buy It Now for only: $25.95 |
| Zoids Brachiosaur Model Kit Hasbro Sealed 012 | |
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$9.99 Time Remaining: 21d 19h 36m Buy It Now for only: $9.99 |
| 1993 MATCHBOX 8 MAZDA RX 7 NEW MODEL SEALED CLOSED NEW IN PACKAGE | |
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$0.99 Time Remaining: 9h 37m |
| Lindberg 1953 Ford convertible model kit sealed | |
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$7.00 Time Remaining: 10h 3m |
| MPC 21511p Tiki Trike 1 25 Scale Plastic Model Kit Factory Sealed | |
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$9.95 Time Remaining: 10h 10m |
| AMT 1 25 Meyers Manx Dune Buggy Plastic Model Kit Factory Sealed Box | |
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$17.49 Time Remaining: 27d 9h 3m Buy It Now for only: $17.49 |
| JO HAN Plymouth Fury 1963 HT 1 25 Scale Plastic Model Kit Factory Sealed | |
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$39.95 (4 Bids) Time Remaining: 10h 12m |
| New Factory Sealed amt 1989 IROC Z Camaro Model 2+2 Coupe | |
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$65.00 Time Remaining: 10h 13m Buy It Now for only: $75.00 |
| TAMIYA 35062 1 35 SDKFZ 223 LEICHTER PANZERSPAHWAGEN FU MODEL NEW SEALED | |
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$20.00 Time Remaining: 5d 13h 56m Buy It Now for only: $20.00 |
| JO HAN C 5100 Police Emergency Wagon 1 25 Scale Plastic Model Kit Fac Sealed | |
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$43.63 (5 Bids) Time Remaining: 10h 16m |
| AMT T475 Corvette Custom Roadster Plastic Model Kit Factory Sealed | |
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$12.39 (2 Bids) Time Remaining: 10h 19m |
| SH 3 Sea King Helicopter Lindberg Model 1 72 Scale 71140 NEW SEALED | |
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$4.50 Time Remaining: 24d 13h 7m Buy It Now for only: $4.50 |
| MPC 1 7406 250 74 Corvette 1 25 Scale Plastic Model Kit Factory Sealed | |
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$12.39 (2 Bids) Time Remaining: 10h 33m |
| MPC 1 7605 76 Corvette 1 25 Scale Plastic Model Kit Factory Sealed | |
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$9.95 (1 Bid) Time Remaining: 10h 36m |
| AMT 2008 Hemi Dodge Challenger SRT8 1 25 scale model kit New Still sealed | |
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$13.99 Time Remaining: 29d 20h 11m Buy It Now for only: $13.99 |
| MPC 2002 300 1969 AMX 1 20 Scale Plastic Model Kit Factory Sealed | |
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$72.89 (9 Bids) Time Remaining: 10h 39m |
| MPC 1 1780 225 32 Ford Street Rod Series 1 25 Sc Plastic Model Kit Fac Sealed | |
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$9.95 Time Remaining: 10h 41m |
| AMT T440 Mustang Hell Drivers Thrill Show Car Plastic Model Kit Factory Sealed | |
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$39.95 (3 Bids) Time Remaining: 10h 43m |
| Airfix German Infantry 1 32 Scale Model 04582 9 sealed in original package | |
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$9.99 Time Remaining: 29d 14h 54m Buy It Now for only: $9.99 |
| MPC 1 7522 1975 Dodge Van 1 25 Scale Plastic Model Kit Factory Sealed | |
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$80.00 (6 Bids) Time Remaining: 10h 45m |
| MPC 1 7622 Dodge Van 1 25 Scale Plastic Model Kit Factory Sealed | |
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$39.95 (6 Bids) Time Remaining: 10h 48m |
| Revell 1 25 32 Orange Crate Ford Sedan Plastic Model Kit Factory Sealed Box | |
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$15.79 Time Remaining: 14d 17h 42m Buy It Now for only: $15.79 |
| MPC 1 0877 Mustang GT 1 25 Scale Plastic Model Kit Factory Sealed | |
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$18.00 (8 Bids) Time Remaining: 10h 50m |
| Monogram 2521 Pinto Street Rod 1 25 Scale Plastic Model Kit Factory Sealed | |
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$20.50 (4 Bids) Time Remaining: 10h 52m |
| VReader New SPONGE BOB Model Sponge BNIP Sealed VTech E Book software | |
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$12.99 Time Remaining: 28d 10h 10m Buy It Now for only: $12.99 |
| MPC 1 7330 Corvette Customizing Kit 1 20Scale Plastic Model Kit Factory Sealed | |
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$39.95 (1 Bid) Time Remaining: 10h 55m |
| HASEGAWA A 7E CORSAIR 2 LTV 148 SCALE P12 MODEL KITNEW SEALED | |
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$35.00 Time Remaining: 10h 56m Buy It Now for only: $38.50 |
| 1960 Corvette Revell Model Kit New In Sealed Box Vintage 1984 Sports Car Classic | |
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$15.00 Time Remaining: 6d 22h 50m Buy It Now for only: $15.00 |
| MPC 1 0411 Chevy Step Side Pickup1 25 Scale Plastic Model Kit Factory Sealed | |
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$27.99 (6 Bids) Time Remaining: 10h 58m |
| Monogram 85 6744 Bath Tub Buggy 1 24 Scale Plastic Model Kit Factory Sealed | |
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$9.95 (1 Bid) Time Remaining: 11h |
| MPC 1 0401 The Grand Superfly 1 25 Scale Plastic Model Kit Factory Sealed | |
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$56.10 (13 Bids) Time Remaining: 11h 2m |
| AMT 632 USA 1 MONSTER TRUCK Model Kit New Sealed GMS CUSTOMS SPRING SALE | |
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$13.90 Time Remaining: 10d 15h 31m Buy It Now for only: $13.90 |
| MPC 1 7705 Corvette 1 25 Scale Plastic Model Kit Factory Sealed | |
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$17.49 (2 Bids) Time Remaining: 11h 5m |
| MPC 402 200 Hogans Heroes Jeep 1 25 Scale Plastic Model Kit Factory Sealed | |
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$46.00 (5 Bids) Time Remaining: 11h 7m |
| Fujimi 1 24 Porsche Cayman S Plastic Model Kit Factory Sealed Box 123967 | |
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$46.15 Time Remaining: 28d 17h 15m Buy It Now for only: $46.15 |
| MPC 1 7612 76 Pinto 1 25 Scale Plastic Model Kit Factory Sealed | |
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$39.95 (5 Bids) Time Remaining: 11h 11m |
| AMT T455 75 Mustang Plastic Model Kit Factory Sealed | |
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$12.39 (3 Bids) Time Remaining: 11h 13m |
| Chrysler Atlantic Concept Car 1 25 Scale Lindberg Model 72712 NEW SEALED | |
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$5.49 Time Remaining: 2d 12h 5m Buy It Now for only: $5.49 |
| AMT T470 Mustang II Plastic Model Kit Factory Sealed | |
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$26.00 (5 Bids) Time Remaining: 11h 15m |
| World War II British Royal Air Force Spitfire MK IX Model RAF sealed 148 | |
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$7.95 Time Remaining: 11h 17m |
| VINTAGE LINDBERG USS RILEY DESTROYER ESCORT SHIP MODEL KIT SEALED | |
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$9.99 Time Remaining: 26d 22h 49m Buy It Now for only: $9.99 |
| AMT T354 Corvette Stingray Conv New For 74 Plastic Model Kit Factory Sealed | |
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$9.95 (1 Bid) Time Remaining: 11h 19m |
| Palmer No 7002 1970 Corvette Stingray Conv Plastic Model Kit Factory Sealed | |
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$9.95 Time Remaining: 11h 22m |
| Revell 1 1277200 Mysterion By Roth Plastic Model Kit Factory Sealed | |
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$9.95 Time Remaining: 11h 27m |
| Estes Electron Beam Model Rocket Launch Controller New Factory sealed | |
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$10.75 Time Remaining: 2d 9h Buy It Now for only: $10.75 |
| Monogram 2230 1 24 Scale 69 Street Camaro Plastic Model Kit Factory Sealed | |
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$9.95 (1 Bid) Time Remaining: 11h 29m |
| AMT 30106 Chevy Nova SS Pro Stocker 1 25 Sc Plastic Model Kit Factory Sealed | |
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$10.89 (3 Bids) Time Remaining: 11h 34m |
| SR 71 BLACKBIRD JET 1 288 SCALE MODEL REVELL 1991 NEW SEALED | |
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$2.99 Time Remaining: 29d 19h 6m Buy It Now for only: $2.99 |
| 1968 REVELL FORD MUSTANG SCALE 132 SNAP TOGETHER KIT MODEL SEALED IN BOX | |
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$5.99 (1 Bid) Time Remaining: 11h 35m |
| JO HAN 62 Convertible Plymouth Fury 1 25 Sc Plastic Model Kit Factory Sealed | |
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$11.00 (2 Bids) Time Remaining: 11h 39m |
| ITALERI 320 COMMANDO CAR 1 35 MODEL NEW SEALED | |
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$14.99 Time Remaining: 22h 49m Buy It Now for only: $14.99 |
| JO HAN C 4369 69 AMX 1 25 Sc Plastic Model Kit Factory Sealed | |
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$42.63 (9 Bids) Time Remaining: 11h 42m |
| Revell H 1301 Datsun Desert Rat W Bike 1 25 Sc Plastic Model Kit Fac Sealed | |
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$12.49 (2 Bids) Time Remaining: 11h 45m |
| NOS Sealed KIBRI HO Scale Model 9952 Water Tower Kit | |
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$19.99 Time Remaining: 29d 15h 59m Buy It Now for only: $19.99 |
| AMT T418 Vantom Ford Econoline Custom Van 1 25 Sc Plastic Model Kit Fac Sealed | |
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$39.95 (9 Bids) Time Remaining: 11h 48m |
| AMT T456 75 Corvette Coupe 1 25 Sc Plastic Model Kit Fac Sealed | |
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$9.95 (1 Bid) Time Remaining: 11h 50m |
O Ring and Rubber Seals Design Engineering
O-rings are acceptable for static sealing but inappropriate for dynamic sealing applications such as pumps and compressors, and high and low pressure applications. In these cases a single elastomer may be used with an X-ring profile to prevent twisting in rotary applications. However a composite seal design is often preferred.
A composite seal is a combination of two or more materials to produce a seal that offers the best attributes of both materials. For example, a T-shaped seal comprises an elastomer T-shaped component and two plastic back up rings. The seals are used in reciprocating piston, rod and rotary applications. The T-shaped design prevents the elastomer rolling and the plastic back-up rings, energised by the rubber elastomer, provide improved high pressure performance. Importantly the T-seals can be installed into standard O ring grooves. Other standard composite seal designs include spring reinforced seals, encapsulated seals, lip seals, energised lip seals and cap seals.
Where greater customisation is needed seal design engineering techniques based on popular CAD packages such as Solidworks, Catia, Pro Engineer and AutoCAD are employed. 3D modelling and analytical behaviour predictive tools such as finite element analysis (FEA) can then be used to explore ‘what if' simulation scenarios to produce a 'right first time' design. Seal selection tools to assist the engineer are also available online. Temperature and chemical compatibility, groove dimensions for the most common o ring sizes, and physical performance datasheets enable selection of the most appropriate o ring seal.
As never before the design engineer is able to fine tune the performance of equipment rubber seals and gaskets, thanks to the development of new materials and improved design and manufacturing techniques.
Optimising sealing performance involves striking a balance between often competing properties: mechanical performance vs temperature resistance vs chemical resistance vs rapid gas decompression resistance and so on. The need for compromise is reducing all the time as weaknesses in existing elastomers are polymer-engineered out and new materials developed to meet extreme operating conditions are applied to more mainstream markets.
One such material is fluoroelastomer (FKM). FKM seals provide high temperature and chemical resistance to a broad range of chemicals and solvents. However the elastomer typically shows poor resistance to hot water and steam. By changing the way the polymer is manufactured radical improvements in water and steam resistance can be achieved. Within the FKM family of materials, there are differing ‘cure systems' – the chemical cross-linking reaction (vulcanization) which occurs to join the polymer chains together. Common FKM sealing materials are of two types: co-polymer and terpolymer. The commonly used traditional, bisphenol-cured, co-polymer fluoroelastomers are cured by utilizing a ‘condensation' reaction where, water is generated during the cure process. When the fluoroelastomer is exposed to high temperature water and steam environments, the cure is reversed, breaking down the cross-links of the material, leading to premature failure of the rubber seals.
Peroxide-cured, terpolymer fluoroelastomers, on the other hand, do not suffer the reverse condensation reaction. Instead, the peroxide cure system is a ‘free-radical' reaction, and as such, provides superior water and steam resistance. This, and other new compounding techniques, is now enabling FKM elastomers to withstand steam cleaning regimes up to 200˚C.
About the Author
O Ring Seals. PPE manufactures and supplies molded rubber O rings.
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