O Ring & Basic Seals

O-Rings

As an independent manufacturer, we are one of INDIA’s leading suppliers of precision seals. We advise, develop and manufacture for you – always with the aim of providing you with a satisfying solution to your requirements, as well as assisting you with the smooth running of your processes. In order to avoid production downtime caused by damage to seals or by leakages we offer our customers high degree of materials expertise. Like this, it quickly pays off for you to rely on the specialists.

In the world’s largest O-ring warehouse, we have over 45,000 different items in stock for you, including not just standard sizes but also special size variants, made from a wide variety of materials. You can directly make your choice and place your order. Or ask the specialists in our application technology department for expert advice: Our high-tech products provide you with clear benefits.

Our starting point is always a wide range of Elastomer with outstanding performance characteristics. Our objective is to provide solutions you can depend upon. This results in lower expenditure on maintenance and lower follow-up costs.

Hallmark of the O-Ring is its diversity. As diverse as its areas of application, from tap fittings to air-conditioning systems, from the car engine to the dental drill, are the requirements that are being placed on it. Depending on the application, the O-Ring must be resistant to ozone, swelling or high temperatures, chemically stable at times, then pressure-resistant or flexible at low temperatures, and in the food industry it needs to be FDA-compliant, i.e. compatibility with foodstuffs is required

But the most important requirement is the close partnership with you: Are you searching for dependable quality at a fair price? Do you require a custom solution suitable for your sector, which will enable you to secure your market advantage? Let’s discuss your requirements…

The Secret Helper: The Back-up Ring

O-rings count among a machine’s most sensitive components, and must be protected from pressure damage. At high pressure, and without this protection, O-rings can be forced into the sealing gap by extrusion, and destroyed. Leaks then result.   Some constructions do not permit the sealing gap to be designed so that it is sufficiently small in relation to the system pressure. In such circumstances, the use of a back-up ring makes sense. They protect the O-ring from being destroyed if high pressure occurs or larger gaps must be sealed.

But expertise is required in this respect: Back-up rings with special properties  The back-up rings are predominantly made from PTFE. This material’s favorable properties speak for themselves: the enormous temperature range of from -200°C to 260°C, the appropriate hardness and a virtually universal resistance to various media.  

PTFE’s flow properties protect the softer rubber rings from mechanical damage. To do so,  the back-up rings are fitted behind the O-ring on the non-pressure side or if  the pressure direction changes, at both sides. When it is under pressure, the backup ring deforms and therefore bridges the gap that must be sealed.  

Depending on the application, the following variants of back-up rings are used.

Single Turn or
Split Back-up Rings

Solid Back-up Rings

Spiral Back-up Rings

Contoured Rubber
Back-up Rings

U Cup Seals

U-CUP AND LIP SEALS DELIVER PERFORMANCE IN DYNAMIC APPLICATIONS

  • U-Cups are designed for dynamic reciprocating applications up to 1250 PSI
  • U-Cups have longer sealing life than O-Rings due to lower friction
  • Also available in non symmetrical Rod and Piston configurations
  • U-Cups can be designed for use in some reciprocating and rotary applications
  • Custom Lip Seals can be designed to perform in non-standard existing grooves

RUBBER U-CUPS AND LIP SEALS

For basic hydraulic, pneumatic and other dynamic applications

STANDARD RUBBER U-CUP CONFIGURATIONS

Highest Availability in 70 Durometer Nitrile but available in any material.
Angled and Straight Lip styles are vitually interchangeable in basic applications

Angled Lip Standard U-Cup

(Parker U-Cup 8400 Style)

Straight Lip Standard U-Cup

(AN6226 Style U-Cup)

COMMON CUSTOM RUBBER U-CUP CONFIGURATIONS

Our expert engineers can assist with designs to maximize performance often with costs only slightly more than similar commodities.
Let us help you differentiate yourself from the competition

Angled Lip Standard U-Cup

Designed for lower friction and quicker reaction to pressure. Suitable for reciprocating and medium speed reciprocating .

Angled Lip Standard U-Cup

Designed for heavier loading and more positive sealing capabilities. Suitable for reciprocating and low rotary applications.

Angled Lip Standard U-Cup

Designed for fast reciprocating and/or fast rotary applications

X-Rings / Quad Rings

X-rings (also known as quad rings or four-lobed seals) offer an alternative seal solution to O-rings for use in reciprocating dynamic or rotary applications.

They are often used in applications where the seal is required to operate under lower pressure and temperature conditions. Under low pressure, high sealing efficiency can still be achieved with an X-ring as the mold parting line is not coincident with the primary sealing faces.

X-rings can typically be retrofitted into existing O-ring grooves with the size often based around the original O-ring size. The square envelope of the X-ring stops the seal from twisting and rolling, preventing spiral failure often seen when O-rings are used in reciprocating applications. X-rings can be manufactured to standard O-ring sizes, as well as custom sizes for specific applications.

X-rings can also offer a reduction in friction as trapped media between the lobes can provide lubrication to the sliding sealing face. For low pressure applications, the combination of a low modulus material and small cross section can help to reduce friction. In high pressure applications, the friction can be reduced by selecting a higher modulus material with a reduced coefficient of friction.

High performance materials

With an unrivalled range of elastomer materials available, ISMAT has an elastomer for every application, with performance characteristics that meet high temperature, high pressure and aggressive chemical applications.

Lip Seals

Energized lip seals comprise of a high modulus elastomer, (or high grade engineering plastic) jacket and a low modulus elastomer O-ring energizer. The low modulus O-ring energizes the jacket under low pressure conditions to increase the sealing force allowing them to be used in low and high pressure applications.

Energized lip seals provide a versatile sealing system for uni-directional pressure applications in either static or reciprocating dynamic conditions. Energized lip seals are symmetric in their cross section and so they can be used in both rod or piston grooves. Backup rings can be used in conjunction with energized lip seals to enhance extrusion resistance.

There are various profiles of energized lip seals available with differing qualities depending on application requirements.

D-rings

D-rings offer another alternative seal solution to O-rings for use in reciprocating dynamic or rotary applications. They offer the same sealing characteristics as an O-ring and can be used in both low and high pressure application across a broad range of temperatures.

D-rings can typically be retrofitted into existing O-ring grooves with the size often based around the original O-ring size. The flat geometry on the base of the D-ring stops the seal from twisting and rolling, preventing spiral failure often seen when O-rings are used in reciprocating applications. D-rings can be manufactured to standard O-ring sizes, as well as custom sizes for specific applications.

For low pressure applications, the combination of a low modulus material and small cross section can help to reduce friction. In high pressure applications, the friction can be reduced by selecting a higher modulus material with a reduced coefficient of friction.

Wiper Seals - Scraper Seals

Wiper seals are also known as scraper seals, excluders and collars. Their primary role is to provide a physical barrier to limit the ingress of moisture, dirt and other contaminants from piston rods used in hydraulic systems into the primary sealing system. This prevents external contamination from damaging internal seals and other system components.

Wiper seals are typically used in conjunction with other sealing elements and require a snap in fit into rod groove locations, complimenting a primary sealing solution.

Square Rings

A Square Ring is a sealing device made in the form of a torus (round top view), with a square-shaped cross-section (side view).

Other names for Square Rings are Washer Rings, Lathe-Cut Rings.

The primary reason for using a Square Ring in a sealing application is that they perform the sealing function in a superior manner – and at a cost lower than any other comparable sealing device. For existing applications, there is no need to change the design or procedures. Square Rings fit in o-ring grooves and are interchangeable size-for-size.

Square Rings are available in a variety of rubber and plastic materials such as NBR, Viton, EPDM, Teflon, etc. In most static applications, a Square Ring will serve as a direct replacement for an o-ring and generally will perform a high-pressure sealing function as well as or better than an o-ring.

Square Ring Sizes

We primarily stock American Standard (AS568) sizes of square rings in Nitrile ,CR and Viton®. We can also supply Square Rings to metric dimensions.