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Different elastomers for o rings and various applications

An elastomer is a primary raw material used for most o rings. They are typically manufactured as gum rubber or manufactured synthetically, and surprisingly today, there are approximately over 32 different synthetic rubbers now available.  Elastomer compounds will...

Spiral wound gasket thickness – what’s best?

It is often recommended that using a thinner gasket type/material will result in better sealing performance.  Why?  Because thinner gaskets tend to require much less gasket stress to provide applications with the perfect seal, they also have an excellent response to...

Choosing the correct oil seal application

Choosing and using the proper sealing devices within oil and gas applications can be vital when preventing dirt, dust, water, and other debris from potentially getting inside and contaminating products.  Of course, all rubber materials and seals will provide a range...

Nitrile rubber, NBR, and Buna-N – how well do you know your o ring materials?

A widely used elastomer, Nitrile, Buna-N, or NBR rubber, are all oil and fuel resistant and provide a great level of strength, making them a popular material for seals across various industries.  Suitable for a range of applications, this versatile rubber material,...

Optimum squeezing force for an o ring

It is true that the more squeeze you place on an o ring, the tighter the seal it will provide. In essence, the more squeeze (compression) you apply, the greater the force between the o ring and its mating hardware.  And ensuring you have the perfect seal is all...

O Ring Squeeze

The squeeze and shrinkage on an o ring are vital to understanding as these factors stand in the way of your application either experiencing a perfect seal or your application suffering from leaks.  You can measure the shrinkage of an o ring during...

Keeping your o rings bonded

EMI o rings. Those seal ring gaskets are made of silicone compounds, combining environmental sealing with electromagnetic interference protection.  Consisting of metal or metal-coated particles, silicone o rings are filled with silver, silver aluminium, or nickel...

The importance of mechanical seals when reducing water consumption in mining

Environmental considerations are at the top of most industry's agendas in the 21st century as companies evaluate and improve operations, processes, and systems.  Conserving water in mining is one such area that is now being investigated further with the rotation of...

How choosing the correct gasket reduces risks

Health and Safety across any industry are vital, especially so in industrial facilities and settings.  Why?  Because harmful leaks and emissions must be avoided at all costs to avoid serious accidents or injury to your teams and property.  That’s why having the right...

How to tighten your bolts perfectly

How to tighten your bolts and which tools you should use to achieve the perfect seal is not as seamless and straightforward as we would like. Various factors come into play in these situations, such as bolt grade, size, and even application type.  Tightening torques...

Materials that can be Used in Producing Gaskets

Materials that can be Used in Producing GasketsSeals and gaskets are meticulously manufactured to be able to withstand the exacting conditions under which they function. Not only does a gasket seal two distinct parts and allow the containment of extreme temperature fluids, steams and gases, but it must meld the sealed surfaces and not extrude.    

Its requirements extend to remaining stable and whole as this lends to the durability of the application in which it is used. Taking these demanding necessities into consideration means a gasket manufacturer must use the latest technology and the best materials to produce an acceptable product.    

Common Materials used in Gaskets 

Gasket materials can be divided into four basic categories.   

Elastomeric Materials 

Standard gasket production involves fabricating from sheets of materials. The most common form of sheet material used is an elastomer mixed with anonymous filler/fibre 

  • Butyl rubber: Resistant against ozone, gas, mild acids and alkalis; weakens on exposure to oil or fuel.  
  • Chlorosulphanated polyethene: Resistant against acids, alkalis, oil and fire.  
  • Ethylene propylene diene: Resistant against ozone, steam, acid, and alkaline liquids and vapours; unsuitable for proximity with solvents and aromatic hydrocarbons.  
  • Fluoroelastomer: Resistant to many corrosives, oils, aliphatic hydrocarbons and acid; unsuitable for proximity to esters, steams, vapours, amines and ketones.  
  • Rubber: Flexible with excellent resistance to acid/alkalis and salts; unsuitable for proximity to oil or solvents; weakens when exposed to long-term oxygen, ozone or UV/sunlight.  
  • Neoprene®: Withstands oils, ozone, sunlight/UV exposure, mild acids, alkalis, salts and solvents.  
  • Nitrile: Resistant to chemicals and temperatures, hydrocarbons and oils/fuels. Unsuitable foresters, ketones, strong oxidants and petroleum derivatives.  
  • Ask the experts at Specialist Sealing Products for more in-depth information about other elastomeric materials and their properties that are used in the manufacture of gaskets.  

Fibrous Materials 

Fibrous materials are well suited to any application that requires constant fibrillation without extrusion or wear and tear.   

  • Aramid: Kevlar is the best-known use of aramid which is composed of polymer fibres linked in rings. This structure gives an aramid gasket strong stability when used within a medium temperature range.  
  • Asbestos: This material still has its uses in gasket manufacture because of its extreme resistance to heat as well as pliability and strength.  
  • Carbon fibre: A gasket made from carbon fibre does not retain or build up the heat; it disperses it, and this must be taken into consideration with the surrounding parts in the application. It is widely resistant to chemicals and acids/alkalis.  
  • Cellulose: The constituent that makes plant stalks; it is bendable yet strong. It imparts these properties to gaskets.  
  • Glass: Not brittle; strong and chemical resistant.  
  • Mineral wool: Gaskets made from this man-made fibre are best suited to medium temperatures.  

Other Gasket Materials and Types 

  • Flexible graphite 
  • Mica 
  • Cork 
  • PTFE (Teflon™)

Metallic Materials 

Gaskets types made from metallic materials are best suited to sealing higher temperatures and pressures. They are mostly used for applications such as compressors, pumps, valves and condensers. They are manufactured from carbon steel, titanium alloy, aluminium and copper.   

When unsure whether an application should use a metallic, fibrous or elastomeric gasket, reach out to an expert at Specialist Sealing Products for advice on the best gasket type. Their extensive knowledge of seals and gaskets will set you up for success.

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