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Gasket And O Ring

Although the use of both gaskets and O rings for sealing, these devices are quite distinct with regards to their appearance and application. In some instances, the employment of sealing products for engineering appear to be interchangeable. However, it is not so in the case of O rings and gaskets. Both of them have distinctive seals, which means that they each have a specific skill set. Thus, their use is what sets them apart. For instance, both the components perform differently based on both the pressure as well as the design specification.

Gaskets
The use of a mechanical device such as this could be to seal connections between two flat-surfaced flanges or components to prevent leaking. The manufacture of this device includes the use of different types of elastomeric materials such as EPDM, Nitrile, Viton, or Neoprene. Their applications range across several industries, including pulp and paper, oil and gas as well as electricity generation. It is possible to layer this component with many different coatings, which with the end-use and application. This equipment could also be laminated or layered with a pressure-sensitive adhesive. Or several coatings could be applied in a combination. Composite, or as referred to as a metal-reinforced material, offers the most powerful resistance to both heat and pressure seen in the market today.

As a general thumb rule, many users substitute a gasket under one condition, once a piece of equipment has been taken apart; after its re-assembly. Commonly used as static seals, the production of this device ranges across many sizes and shapes. They could also be customized to suit the needs of the application.

Generally, high-performance equipment like these, are produced from high-grade materials. The design of this High-performance based device is with the intention for use in specialist applications. For instance, the implementation of PTFE protected type - which is a high-performance type component is in industries like chemical processing. The design of the FDA type component is suited for food processing applications.

Types of Gaskets

Type  
Non-metallic
  • Graphite
  • Cork
  • Silicone
  • Rubber
  • Compressed Non-Asbestos Fibre (CNAF)
Metal  
Composite
  • Kammprofile
  • Spiral Wound
  • PTFE envelope

O rings
Typically shaped like a circle, they are similar to gaskets are produced across a wide range of sizes and materials. The use of this component is in instances where machines require fluids to be both contained as well as separated from other environments. Hence, the device is pressed between two parts of the machine to create a seal.

Components like these are elastomeric. Hence, they work together effectively with glands. A device such as this works internally - a part of an installation.  These glands typically are cut from metallic hardware and work in combination with the component to form the seal. The best performance is warranted should both the O ring as well as the gland ideally designed at the same time.

Production of High-performance components from materials, for example, Perfluoroelastomer (FFKM), Fluoroelastomer (FKM) as well as Silicone. These materials are durable and work well as an O ring. The manufacture of standard High-performance type includes the following sizes BS1806, BS ISO 3601-1, AS-568A, and BS ISO 3601-2. Components such as these gain support from a wide range of non-standard tooling.

The use of either device is dependent on several factors that is the environment, tolerances,  applications, and general function. An O ring requires a cylindrical groove or a channel in flanges to sit in, whereas a gasket works with a flat surface like a flat flange.

Another factor to be taken into account while choosing between the two is the pressure of the application. Gaskets can maintain a seal through high and low temperatures or pressures. On the other hand, the pressure an o-ring can handle extremely high. A fact that is visible in the presence of a channel to prevent blowout.

Types of O Ring

Color Made Standard Temperature Range
Black EPDM EN 681-1 -10° to +110°C
Yellow HNBR EN549 -20° to +95°C (gas/ water)
-20°/+70°C (only gas)
Green FKM   160°C