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The Evolution of Gasket Solutions

When we talk about gaskets and the history of a gasket, we must start at the very beginning.  What is a gasket?  Ultimately, a gasket is a manufactured seal that is used to fill the gap/space between two or more surfaces.  Gaskets are typically manufactured by cutting...

How to preserve your gasket

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Important Design Features of Rubber Sealings

When it comes to designing the perfect rubber sealing, there are a few design features to bear in mind to help achieve the optimum solution.  In this post, we explore these rubber sealing features further and provide information on the benefits and best uses for these...

Optimal Squeeze for an O Ring to be effective

A doughnut-shaped seal that is primarily used to stop liquids and air from escaping or getting into specific spaces is the function and role of an O Ring.  Also known as a mechanical gasket, O rings are designed to fit between a groove and a compression during the...

High-temperatures and O Rings, what you need to know

Fluctuations in temperature and indeed heat is a significant factor across many applications that make use of o rings.  However, what is well known is how destructive heat can be when it comes to compound deterioration.  You are making choosing the ideal o ring...

How to restore your damaged rubber seals

Under the right circumstances and having the right tools to hand, you can restore rubber gasket seals and have them working as good as new in no time.  Rubber gasket seals provide a seal between two separate mechanisms, providing airtight seals to keep liquids and...

The importance of backup rings to O rings

Backup rings are ultimately used to help stop o ring migration, and they achieve this in both static and dynamic fluid power applications as the pressure cycles occur, preventing the extrusion of an o ring in the gap.  Ultimately a backup ring is a rigid ring that...

Gasket manufacturing process explained

Specialist Sealing Products have been providing high-quality gaskets to customers throughout the UK for many years. We pride ourselves in the range of gaskets we have available, suitable for a variety of applications across a range of industries.  Rubber gaskets are...

Designing seals for the food industry

There’s a number of factors to take into consideration when designing seals for the food industry. That’s because seals used within this sector need to work exceptionally hard in all food processing environments where hygiene and health and safety are of the utmost...

Storing your gaskets!

A strange headline for a gasket article, we know.  However, it’s an important area and one, which in this sector is often overlooked.  When we think about most products or items in and around our homes and business, we will recognise that most come with manufacturing...

METAL JACKETED GASKETS

The Metal Clad Gasket is the most basic and cost effective type of semi-metallic gasket. 

Applications Include  

  • Heat Exchangers 
  • Pressure Vessels 
  • Valve Bonnet Gaskets 
  • Pumps 
  • Boilers and Flues 
  • Exhaust gases 

General Properties 

  • Economical and cost effective 
  • Easy to handle and install 
  • Suitable for narrow flanges 
  • Suitable for high temperature 
  • Suitable for high pressure 
  • Cover a range of chemical media 
  • Good blow-out resistance 
  • Available in many styles, shapes and sizes 
Metalclad Jacketed Gasket
The Metal Jacketed (Clad) Gasket comprises a metallic outer shell which encapsulates a soft compressible filler material. This soft filler material provides the gasket with compressibility and resilience while the metal jacket resists pressures, temperatures and corrosion, whilst providing good gasket stability and blow-out resistance. Selecting the correct grade of metal jacket will also provide a suitable resistance to a wide range of chemical media.

There are two different styles of manufacture of Metal Jacketed Gaskets, these being of a One-Piece, or alternatively, a Welded construction.

One-Piece Construction

One-Piece Construction 

These are manufactured using a single sheet of material.  

This can therefore restrict the size of gasket available as it is dependent on the sheet size of material available, generally between 1400 mm and 1800 mm in diameter. The pass partition bars are also in this one piece construction intersecting with the outside ring. Should leakage occur, the flow path will follow along the length of the pass bar to the outer diameter of the ring where sealing will become reliant and be maintained by the secondary seal. 

Welded Construction

Welded Construction  

This type of construction does not have any limitations on gasket size. It is also generally more cost effective as the process is quicker and material yield higher. The pass partition bars are securely welded into place with soft and small spot welds in two places at each end of the bar. Any leak path is retained by the primary seal at the inner diameter of the gasket therefore providing a technically superior gasket seal. 

5 Main Styles of Metalclad Jacketed Gasket

Styles available   

There are 5 main styles of Metal Jacketed Heat Exchanger Gaskets, available in a wide range of metal jackets and filler material configurations 

Double Jacketed Gasket

Style MCG1

Double Jacketed Gasket : Used on high temperature and pressure applications or where corrosion problems may exist. The filler material is totally enclosed in a two-piece metal encapsulation having good compressibility and resilience and is the most common and popular style of Metal Clad Gasket 

Single Jacketed Gasket

Style MCG2

Single Jacketed Gasket – Partly Enclosed : This is the least used and most uncommon Style. Used where flanges are pitted or of poor surface finish, or where the radial dimensions only allow for a narrow width seal 

Style MCG3

Style MCG3

Single Jacketed Gasket – Totally Enclosed : Similar to style MCG2 but totally enclosed in a metal shroud giving more filler protection. This may be used on narrow flange widths where Style MCG1 is unsuitable 

Single Corrugated (No Filler)

Style MCG4

Single Corrugated (No Filler) : This is a plain, all metal corrugated gasket It is used mainly in low pressure valve applications with a small recess gap or weight limitations and where the available bolt loads are low.     

Double Jacketed Corrugated Gasket

Style MCG5

Double Jacketed Corrugated Gasket Manufacturing process as with Style MCG1 only it is then corrugated. These corrugations give improved resilience in applications where thermo-cycling may be a problem. These also give a reduced contact area which enhances its compressive characteristics making it suitable for uneven flanges. 

Materials Available 

Metal Jacket  Materials Soft Filler  Materials 
Soft Iron Non-Asbestos Millboard 
304 Stainless Steel Graphite 
316/L Stainless Steel Rubber  
316 Ti Stainless Steel PTFE Sintered 
321 Stainless Steel PTFE Unsintered 
347 Stainless Steel Ceramic Fibre 
Duplex Non-Asbestos 
Nickel 200 Firefly 
Monel 400  
Titanium  
Hastelloy B2, C276  
Inconel 600, 625, 800, 825  
Aluminium  
Copper  
Brass  
The manufacture of Metal Clad Gaskets has very few restrictions and can be made in a huge range of sizes, styles, shapes and dimensions. Different bar configurations are possible, as detailed below. Alternatively, we can manufacture to specific customer requirements.
Metalclad Jacketed Gasket
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