Todays deals on Ring Seal?

Chemraz 92740SC520 2-274 Compound 520 O Ring Seal 78-2710 $275.00

SLIP RING 14 WIRE SEALED POWEREEL Free Ship Guaranteed 30 days $238.00

Millipore Wafergaurd 2 In-Line Gas Filter F-Mini ¼ inch O-ring Seal WG2F01HC1 $164.99

(13) NEW APPLETON ELECTRIC BLSG-250 2 1/2 INCH LIQUID TIGHT RIGID SEALING RINGS $149.99

CEDAR RAPIDS INC CR-461 ASPHALT PAVER PLANITARY GEARBOX RING SEAL R9-16935116 $129.95

Fisher Industrial 0544 Graphite 17F27 6″ Piston Ring Seal Valve 1U5069X0012 $119.98

Lock Rings & Sealing Rings 271 pcs mixed – New -z224-8 $99.00

Glenair 310HS001NF21 Size 21, O-Ring Sealed Shrink Boot Adapter $92.75

Electrical Enclosure Box 21″ X 14″ X 6″ O-Ring Sealed Cover $95.99

ITT Cannon MS3108R22-14S Angle Plug with O-Ring Seal-less Cable Clamp, Size 14S $86.75

180 Piece KIT Perma Seals Ring Butt Qd Heat Shrink Terminal Connector MOLEX $79.95

Glenair 310HS001NF15 Size 15, O-Ring Sealed Shrink Boot Adapter $80.00

NEW Lot of 3 T&B ST100-469 1″ Star Teck Cable Fitting w/ Sealing Ring Jacketed $84.99

50 PCS BNC MALE BULKHEAD MT O-RING SEAL – DDK AMPHENOL $69.00

NEW Lot of 2 T&B ST100-469 1″ Star Teck Cable Fitting w/ Sealing Ring Jacketed $68.99

10 nib OZ 4Q-4150 1-1/2″ 45 DEGREE LIQUID TIGHT CONNECTORS w/ sealing ring $49.99

HEAT SHRINK 12-10G 10 STUD HEAT SEAL RING 100pcs NEW $59.99

Glenair 340FS002M14-3N O-Ring Sealed Cap Backshell $58.49

Knurr lifting 4 rings + bolt eye – for rack new sealed $19.90

Consolidated Triple Labyrinth Seal Ring LER 118 NIB $47.59

JOHN CRANE SEAL HEAD & RING ASSEMBLEY; JOHN CRANE SEALS- 3Pc Set *E16 $30.00

T & B FITTINGS 5306 1-1/2″ RIGID CONDUIT SEALING RING $38.00

STAINLESS STEEL 316 SS O RING FL X 3-1/2″ OD 3 SEAL NNB $38.00

CONSOLIDATED # LER122 RING SEALS $42.00

CONSOLIDATED # LER1336 RING SEALS $42.00

ITT Cannon MS3108R20-4S 90° Angle Plug with O-ring Seal-less Cable Clamp $35.00

Parker Seal-Lok O-Ring Face Seal Tube Fitting 1″ 16-S6LO-S Steel NEW (544) $39.95

Consolidated Triple Labyrinth Seal Ring LER-106 NIB $39.94

MORI SEIKI O-RINGS / SEALS ( S22063A ) $35.00

100 Yellow PERMA SEAL Heat Shrink RING Terminal Connector #12-10 Wire 1/2″ MOLEX $35.00

4 – Marinco 110R Sealing Collar and Ring, 125 Volt, 30A $24.00

HUBBELL 20509001 METAL CLAD SEALING O-RING ***NIB*** $24.00

MORI SEIKI O-RINGS / SEALS ( S22064A ) $30.00

1 1/2″ Sealing Rings Rigid Conduit T&B #5266 lot of 14 (NEW) $29.99

STAINLESS STEEL 316 SS O RING FLANGE X 2″ OD 3 SEAL NNB $28.00

MKS NW100 Seal, Centering Ring, Assembly 100760510 O-Ring $32.99

BOSCH 0820-003-016 O RING-SEAL SOLENOID VALVE $24.00

LINKBELT # LB68633R 3-15/16 RING SEALS $28.75

(4) NEW LASCO 1 1/4″ PVC PIPE UNIONS O-RING SEAL SCH 80 $19.95

75 Red PERMA SEAL Heat Shrink Butts Rings Forks Connectors #22-18 Wire AWG MOLEX $23.00

4 – Marinco 510R Sealing Collar with Threaded Ring, 50A $15.00

SKF Forsheda V-ring V275 2890-1 Made in Sweden Oil Seal approx 10″ inner dia $15.00

NEW MILWAUKEE DQ=58 SEAL KIT “O” RING DQ58 $18.95

HILTI CP643-63/2″N 304326 FIRE STOP RING COLLAR 2″ NEW SEALED PACKAGE $24.99

AMAT 3700-03049 SEAL QUAD-RING KALREZ 8375 $20.00

new Cut-out sealing ring – AC3003 $20.00

25 1/2 Liquidtight Straight Flexible Metal Conduit Connectors sealing ring UL $16.50

MORI SEIKI O-RINGS / SEALS ( S21020A ) $18.00

MORI SEIKI O-RINGS / SEALS ( S21082A ) $18.00

MORI SEIKI O-RINGS / SEALS ( S21019A ) $18.00

1″ Sealing Rings Rigid Conduit T&B #5264 lot of 25 (NEW) $16.99

RAYMOND 41001556 NEW SEAL RING 41001556 $15.00

STAINLESS STEEL 316 SS O RING SEAL END CAP NNB $15.00

MKS NW100 CENTERING RING SEAL ASSY – 100760510 – SS/VITON $14.95

MKS NW80 CENTERING RING SEAL ASSY – 100760508 – SS/VITON $14.95

20 pcs F-type Terminator 75 Ohm with O-ring sealed NOS $9.90

NIB HYDRO-ERGOSEAL SEAL RING $15.00

ENCLOSURE CABLE CONNECTOR NICKEL PLATED 28 MM OD THREAD O RING SEAL NNB $12.00

Used NW80 Varian Vacuum Seal, Aluminum Cent-Ring $14.00

MORI SEIKI O-RINGS / SEALS ( S21026A ) $12.00

MORI SEIKI O-RINGS / SEALS ( S22065A ) $12.00

NK Cables 1/2″ RF N Type Male O Ring Seal Connector $15.99

SKF # TER109 RING SEALS $15.75

LIQUIDTIGHT CONNECTOR T&B 5233AL W/SEAL RING – 3/4″ ALUMINUM LOT OF 2 $12.00

AMAT 3700-01985 SEAL CTR RING ASSY NW40 W/VITON ORING $10.00

Landis & Gyr H9738-8002 Stainless Steel Sealing Rings $14.88

O RING SEAL NUT TRU SEAL 1,1/2″ PIPE THREAD NNB $12.50

25 Yellow PERMA SEAL Heat Shrink RING Terminal Connector 12-10 Wire #8 Std MOLEX $9.25

25 Yellow PERMA SEAL Heat Shrink RING Terminal Connectors #12-10 Wire #10 MOLEX $9.25

25 Yellow PERMA SEAL Heat Shrink RING Terminal Connectors #12-10 Wire 1/2″ MOLEX $9.25

25 Yellow PERMA SEAL Heat Shrink RING Terminal Connectors #12-10 Wire 3/8″ MOLEX $9.25

20 Yellow PERMA SEAL Heat Shrink RING Terminal Connectors #12-10 Wire 1/4″ MOLEX $9.25

20 Yellow PERMA SEAL Heat Shrink RING Terminal Connectors #12-10 Wire 5/16 MOLEX $9.25

6 PCS – BNC FEMALE BULKHEAD MOUNT CONNECTORS – O-RING SEAL AMPHENOL-DDK $12.90

Leviton Marinco Boot Sealing Collar Ring 20A 30A $8.95

O RING SEAL NUT TRU SEAL 1,1/4″ NNB $10.50

(5) Thomas & Betts 1-1/4″ Sealing Rings, 5265 Liquid and Dust Sealing Connectors $10.00

25 Blue PERMA SEAL Heat Shrink RING Terminal Connector 16-14 Wire #6 Stud MOLEX $8.50

25 Blue PERMA SEAL Heat Shrink RING Terminal Connector 16-14 Wire AWG 1/4″ MOLEX $8.50

25 Blue PERMA SEAL Heat Shrink RING Terminal Connector 16-14 Wire #10 Stud MOLEX $8.50

25 Red PERMA SEAL Heat Shrink RING Terminal Connector 22-18 Wire 1/4″ Stud MOLEX $8.50

25 Red Perma Seal Heat Shrink Ring Connector 22-18 #10 $8.50

25 Red Perma Seal Heat Shrink Ring Connector 22-18 3/8 $8.50

25 Red Perma Seal Heat Shrink Ring Terminal Connectors 22-18 Wire #8 Stud MOLEX $8.50

QTY 5 THOMAS & BETTS 5266 1 1/2″ SEALING RING – NIB – 6O DAY RETURN POLICY $12.00

BINKS UNISON PUMP QUAD SEAL RING PT#237-237 (159) $6.99

NW100 SEAL CENTERING RING (NEW IN SEALED PACKAGE) $8.00

New BOC Edwards Cent-Ring Seal, NW40, C10516395 $8.50

O RING SEAL STEEL FRAMED 55 MM I D, 65 MM O D NNB $8.95

4 PCS – BNC MALE BULKHEAD MOUNT CONNECTOR – O-RING SEAL $7.90

4pcs 2-BNC MALE, 2-BNC FEMALE, BULKHEAD MOUNT CONNECTORS – O-RING SEAL $7.90

2 Ea. 4/O Ga. 1/2″ Ring Battery Lug Heavy Duty Closed Tin Seal Wire End Marine $10.69

2 Ea. 4/O Ga. 3/8″ Ring Battery Lug Heavy Duty Closed Tin Seal Wire End Marine $10.69

2 Ea 3/O AWG 3/8″ Ring H D Marine Tinned Battery Lug Closed End Seals Wire $10.22

2 Ea 3/O AWG 1/2″ Ring Battery Lug H D Marine Tinned Closed End Seals Wire $10.22

(4) Thomas & Betts 1″ Sealing Rings, 5264 Liquid and Dust Sealing Connectors $7.60

2 Ea 2/O Ga. 5/16″ Ring Battery Lug H D Tinned Closed End Seals Wire Marine / RV $9.91

2 Ea. 2/O Ga. 3/8″ Ring Battery Lug H D Tinned Closed End Seals Wire Marine / RV $9.91

T&B 5252AL – 1/2″ 90 DEGREE ALUMINUM LIQUIDTIGHT CONNECTOR INCLUDES SEAL RING $6.00

Panduit CMDRHD2 Cable D Ring (New In Factory Sealed Package) $9.00

Ring Seal Questions

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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