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Protecting your seals

Dust gets everywhere.  We see it across the surfaces of our homes and even in our workplaces, especially when the light shines through to show it in its full glory!  However, dust that seeps and builds up within engineering equipment can be disastrous.  Causing damage...

Importance of durometer testing

Durometer or shore durometer is a way for industry professionals to measure how hard such things as plastic, rubber, and non-metallic materials genuinely are.  Its focus is to measure on a Shore A or Shore D scale, looking at how robust material is when examining its...

Metal Detectable O Rings

Metal detectable o rings became a necessary must when it was identified that some chemicals, exposure to extreme temperatures, and continuous vibrations could cause failings in standard o rings.  Failings that not only mean a breaking of the seal, but there is also an...

Tips for best o ring maintenance

If o rings are not maintained, leaks can occur, and water and other fluids can enter the appliance or application, and even product in the mix!  If this happens, damage can occur to internal parts and mechanisms, causing deployment failings, potential false readings,...

What you need to know about O Ring Lubricants

Silicone grease and lubricants aren’t just a nice to have for o rings, but they can quite often be a must-have.  However, with so many greases and lubricants to choose from, it can often be a minefield choosing the best ones and the right ones for your o ring and...

O Ring Replacement

Replacing an O Ring in pressure washer wands is probably one of the most common replacements you'll find when working with seals.  Unfortunately, O Rings don't last forever, and over time they do deteriorate, and you will require an O Ring replacement.  It's important...

Reasons behind seal failure and a look into seal replacement

Unfortunately, there are occasions where O-rings, in particular, fail.  The failure of these seals is not simply due to one factor, but various factors that can occur across a range of applications – hence why locating the exact cause of such problems is just that, a...

Gaskets and seals for Aerospace

Gaskets and seals used for aerospace applications and equipment must be of premium quality and to a substantially high standard.  They are used across a range of applications such as radars, antennas, lighting, access panels, electrical conductivity, pressure sealing,...

Finding the best sealing materials for Food Grade Applications

You will find rubber seals across various industries, providing an important element and operating as a vital fixing across a wide range of different applications and equipment.  However, these FDA gaskets must follow strict, set guidelines, in terms of their material...

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...

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 

Metal-Clad 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 

Metal-Clad 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 Metal-Clad Single Jacketed Gasket

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 

Metal-Clad Single Corrugated (No Filler) Gasket

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.     

Metal-Clad 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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