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ISCA stock and manufacture a wide range of o-ring in a variety of compounds


Size Available

Rubber Hardness:


Standard Imperial/Metric Range

70 & 90 Imperial, 40 to 90 Metric Durometer


Standard Imperial/Metric Range

75 & 90 Imperial, 65 to 90 Metric Durometer

Silicone FDA:

Standard Imperial Range & Metric Range

40 to 80 Durometer


Standard Imperial Range

60 & 70 Durometer

Ethylene Propylene:

Standard Imperial Range & Metric Range

55 to 90 Durometer


Standard Imperial Range

70 & 80 Durometer


Imperial and Metric Range


Teflon Back Up Rings

Imperial or Metric Solid, Scarf Cut, or Spiral range


Teflon Encap FKM:

Standard Imperial Range


Teflon Encap Silicone:

Standard Imperial Range



Standard Imperial Range

70 & 95 Durometer

Quad Rings:

Standard Imperial Range

70 & 80 Durometer

Back-Up Rings:

Standard Imperial Range

90 Durometer


Standard Imperial Range

80 Durometer


ISCA can Hot Vulcanise O-Rings to any custom size (Internal Diameters 75mm or larger)
Please view Hot Vulcanising page for more detail

Nitrile Compounds(Buna-N)

Nitrile is the “Work Horse” of the industrial seal elastomers and operates in a temperature range from –65°C to 125°C. Nitrile compounds display excellent compression set resistance, along with good tensile strength, tear, abrasion and water resistance.Nitrile provides exceptional resistance to a wide range of fuels and oils. The main weakness of Nitrile is exposure to weathering or ozone, this results in crazing and cracking, particularly under tensile stress or flexure.

Fluorocarbon Compounds(FKM)

Fluorocarbon compounds provide the best combination of chemical and heat resistance. They provide excellent seal ability in high temperature, air, or oil environments. Fluorocarbons possess exceptional gas permeability, and are highly resistant to animal and vegetable oils, acids and alkalis. The temperature range in which Fluorocarbons operate is from –25°C to 200°C. The main disadvantage is at low temperatures, being limited to prolonged service at approximately -15°C. They are normally coloured black, however brown is also available, but has less abrasive resistance due to the absence of carbon black.

Silicone Compounds

The main advantage of Silicone is that it can be used at extremes of temperature, (-65°C to 225°C) and its chemical and weathering resistance is excellent. These compounds are resistant to animal and vegetable oils and can be used in aqueous and fatty food environments. Silicon, due to it’s non-toxicity is also widely used in the Medical industry, hot air systems and some nuclear environments. Silicon is available in standard red colour, clear and white colours are also available to meet special purity needs. Disadvantages are poor tensile strength, poor tear and abrasion resistance, high permeation of gases and poor resistance to mineral fluids.

Polychloroprene or Neoprene

This compound is best known for its resistance to weathering and ageing. Its strength, resilience and abrasion resistance are reasonable and its high and low temperature properties are good. Its resistance to petroleum fluids is much better than that of natural rubber, whilst it exhibits limited resistance to aromatic mineral based fluids. The combination of good weathering and some oil resistance makes polychloroprene most suitable for many outdoor applications. Some common applications include dust covers, boots and gaiters in automotive environments.

Ethylene Propylene(EPDM)

Ethylene Propylene has a number of strengths; it has excellent resistance to weathering and ozone, water and steam, and has good performance in castor and some phosphate ester based fluids. EPDM has good resistance to acidic and basic fluids, and a useful temperature range of -55°C - 150°C. Some applications of this polymer include; being used in central heating, high temperature systems employing castor based fluids, for mouldings subjected to weathering and ozone, and for seals in chemical plants (due to its good chemical resistance). EPDM however, has poor resistance to petroleum fluids; also, it should never be used in contact with mineral based fluids or DI-ester based lubricants due to excessive swell and deterioration.

Polyurethane Rubber

Polyurethane is particularly noted for high tensile strength, outstanding wear and abrasion resistance, and for excellent resistance to extrusion. It also holds up very well in petroleum fluids. This combination of properties makes the polyurethane’s invaluable for heavy duty hydraulic piston and rod seals such as those on power shovels, back hoes, scrapers and other earth moving equipment. The major limitation of polyurethane is its limited temperature capabilities and sensitivity to water and humidity. Compression set is also poorer than many other compounds, making it more useful for pressure assisted functions.


Fluorosilicone is a chemically modified version of silicone. The advantage of this over silicone is that it has good resistance to petroleum fluids. It has a similar temperature range to that of silicone, that is, a broad range of temperature capabilities. Like silicone, however, it has low tensile strength and poor abrasion resistance.

Polytetrafluoroethylene (PTFE)

PTFE compounds are invaluable as they are resistant to all chemicals except for alkali metals and some halogens. Their low coefficient of friction permits them to slide very easily on almost any smooth surface without additional lubrication. They also retain good physical properties over a wide range of temperatures. PTFE is heat resistant up to 300°C.Some disadvantages are PTFE is it is not very resilient and has a tendency to “cold flow” or deform under high pressures. This “cold flow” effect sometimes causes PTFE to extrude, particularly at high temperatures combined with high pressures.

Encapsulated O-Ring Seals(FEP)

An encapsulated O-ring comprises an elastomeric energising core, which has a seamless jacket made from fluoropolymer. The elastomeric core is usually viton, however, silicone is also available. The jacket is made from Teflon. FEP is advantageous with the use of hostile chemicals or extreme temperatures that can make sealing very difficult. Its main advantage over the PTFE is that it doesn’t suffer from cold flow under compression and has memory to return to its original form. Whereas PTFE’s only advantage over the FEP is that it enjoys true chemical inertness. Applications not recommended for encapsulated O-rings are dynamic applications with high speeds, poor surface finishing to housings or shafts and cases where excessive stretch or collapse are required on installation. FEP is less resilient and provides a less positive seal than an O-ring.

Back-Up Rings

These rings can be found in a variety of materials and assist in improving the pressure-retention ability of an O-ring. For instance, a 90 durometer back up ring can increase the pressure tolerance of a standard 70 durometer O-ring. Back-ups also improve extrusion resistance. Back-ups do not however, improve the wear and friction characteristics of the O-ring itself. Teflon back-up rings may also be used in reciprocating O-ring seals. The smaller Teflon sizes must be split to facilitate their assembly into piston or rod grooves.

The PTFE or Teflon rings can come in Split style as mentioned above, Solid, and Spiral Style.

Quad Rings

These are seals, which function much like O-rings in static seal glands. The quad ring is a four-lobed design, which is recommended for both static and dynamic applications. It is sometimes recommended where low- pressure leakage is critical and a light squeeze is desired.


V175 has excellent resistance to a wide range of chemicals, including caustics, steam, amines, phosphate esters, engine lubricants and glycol based brake fluids. The temperature range is form -15°C to 230/260°C.