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O-Rings

Our O-rings are group into the following sections:

The O-ring is the most common form of general purpose static seal. A typical arrangement is shown in the following figure:

O-rings

As shown in the above figure, the design of the groove for an O-ring is relatively simple, but it is important to follow well-developed design rules. Here at Advanced Sealing Devices, we will help you to find an O-ring that is in compliance with rules so that your sealing device does not lead to unnecessary problems and cause expensive downtime.

We offer the following types of sealing rings:

• Precision sealing rings in Round-profile (O-ring), Square-profile, Rectangle-profile and X-profile (X-ring)
• length of cords (o-ring cords) in Round-profile, Square-profile, Rectangle-profile, X-profile and other profiles specified by you.
• Vacuum grade / Vacuum Baked O-rings
• Cryogenic O-rings / High Temperature O-Rings / Metal O-rings
• Encapsulated O-rings
• PTFE O-rings / Teflon O-rings
• Conductive O-rings / EMI O-rings / RFI O-rings / Anti-static O-rings

High Performance O-Rings

We offer O-rings in the following categories:

  • standard English-unit sizes O-Ring specified in AS568, MS28775, BS1806, other aerospace industry standards, and military specifications,
  • standard metric-unit sizes O-Ring specified in DIN 3771, ISO 3601-1, JIS B2401, SAE J1926, and ISO 6149,
  • standard French R series O-Ring ,
  • non-standard O-Ring sizes specified by you.

In making an O-ring that suits your design, we not only consider the application, but also the O-ring material. A typical O-ring can withstand a pressure of up to 100 bar, but we can help you to design an O-ring system that can be used up to 250 bar. Contact and talk to us today about extreme O-ring application.

Beside O-rings, we can also make rectangular section rings, X-section rings, T-seals, L-section seals and any other profiles and materials specified by you. If you cannot find a standard material that suits your application, let us know and we will compound one for you. Although O-rings are the most common form of elastomer seal, they have a number of limitations. Talk to us and we can design and find an O-ring that fits your system.

Vacuum grade O-Rings (Vacuum baked O-Rings)

We have the capability in-house to make Vacuum Baked O-rings to be used in all vacuum applications. With our process, our Vacuum Baked O-rings can prevent CRAPP and also remove CRUD. Our vacuum baked process is not only restricted on Vacuum Baked O-rings, we can also perform the Vacuum baked process on other seals and moulded products that we make.

Cryogenic O-Rings / High Temperature O-Rings / Metal O-Rings

We can make Cryogenic O-Rings, High Temperature O-rings, and metal O-rings that are designed for extreme conditions that can be used from cryogenic temperatures up to 800 degree Celsius. These rings are used in nuclear power plants, high vacuum systems, turbine gas, oil and gas plants and as cylinder heads and exhaust seals. For special applications, we can coat your rings with various polymers. We can do this in our in-house coating section.

Encapsulated O-Rings / Chemical Resistant O-Rings

For demanding applications such as chemical resistance and applications that require sterility considerations, we can offer a fluoropolymer sheath surrounding an elastomer ring. The fluoropolymer can be a tetrafluoroethylene propylene copolymer (FEP) or a TFE copolymers with perfluorinated ether (PFA). The elastomer can be a fluorocarbon (FKM) or silicone (VMQ). PFA has a higher abrasion resistance as compared to FEP and silicone has a wider temperature operating range as compared to fluorocarbon.

This type of encapsulated O-ring is most suited for static applications or slow rotary movements in stem valve. The advantages of using this type of encapsulated O-rings are:

  • outstanding chemical resistance
  • better flexibility as compared to pure PTFE O-ring
  • wide operating temperatures ranging from -60 up to 260 degree Celsius.
  • low friction
Type of encapsulated O-ring Operating Temperature (degree Celsius)
PFA encapsulated silicone O-ring -60 to 260
FEP encapsulated silicone O-ring -60 to 204
PFA encapsulated fluorocarbon O-ring, FKM -20 to 204
FEP encapsulated fluorocarbon O-ring, FKM -20 to 204

Just like conventional O-rings, the cross sectional profile of the fluoropolymer encapsulated O-rings can also be oval (for inspection hatch), half-circular (for heat exchanger), square, rectangular (for pump housing or heat exchanger plate) or any other profiles specified by you.

Installing this type of encapsulated O-ring is critical. The best way is to immerse the encapsulated O-ring in 60 - 70 degree Celsius hot water to increase its flexibility and then slide it into the groove, which needs to be chamfered and free from burrs. The aim is to prevent kinking of the encapsulated O-ring FEM material.

Fluoropolymer encapsulated O-rings have wide industrial applications; they are used in chemical processing and production, oil extraction, petrochemical refining, pharmaceutical production, food and drink processing, paint and die manufacture, refrigeration engineering, cosmetics and perfumery, automotive components, and aerospace engineering.

PTFE O-Rings / Chemical Resistant PTFE O-Rings

PTFE O-rings (Teflon O-rings) are used when normal elastomer O-rings cannot fulfil the demanding chemical and thermal requirements of an application. PTFE O-rings are widely used as a static seal and it has the following advantages:

• outstanding chemical resistance, with exception of liquid alkaline metals and fluorine compounds
• wide temperature range from -200 up to 260 C
• FDA approved and can be sterilised
• low friction and no adhesion
• PTFE O-ring can withstand ageing, light, ozone, and its water adsorption is less than 0.01%

Note that PTFE O-rings have very low elasticity, its compressibility and ability to stretch are limited. The PTFE O-rings should be installed in axial or radial with split grooves.

Conductive O-Rings / EMI O-Rings / RFI O-Rings / Anti-static O-Rings

We offer EMI/RFI shielding O-Rings for the electronics, semiconductors, communications, and defence sectors. Our conductive O-Rings provide an electrical path for a system to conduct to a common ground, thus reduce or eliminate the EMI/RFI noise from electronic devices, and protect parts from static electricity. Our conductive O-Rings also shows a shielding effect of 60 dB at 30MHz - 10 GHz.

Our base rubber used for making the conductive O-Rings can be silicone, fluorosilicone or EPDM. The fillers used to make the O-Rings conductive can be aluminium, silver, nickel, copper, silvered glass, silvered aluminium, graphite or nickel graphite. For commercial or general anti-static applications, the conductive O-Rings often use nickel-graphite or graphite as fillers, while for military and aerospace applications, they often call for silver copper fillers in their conductive O-Rings. The electrical resistivity of our conductive O-Rings can range from a few milli-ohm.cm to 10^8 ohm.cm.

   

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