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Tri-Clad Metal

What is a Tri-clad Seal?
 Tri-clad features
Single Cap
 Double Capped
Single Cap Extra
O-Ring
Double Corner Caps

What is a Tri-clad Seal?

Tri-clad is the name associated with any ThermaFoil product that has the added protection of metal foil.  This metal can be a very thin foil for sealability or it can be thick for anti-extrusion.  All tri-clad seals are designed to enhance flexible graphite for specific applications.

Tri-clad features

1) Oxidation prevention: capping flexible graphite with high temperature metal protects the graphite from oxidation when temperatures exceed 850'f.

2) Vibration resistance: flexible graphite either as a gasket or seal can be effected by high vibrations, such as aerospace, automotive, or compressor applications. Cladding these seals eliminates vibration fretting.

3) Seal removal: cladded seals can be removed with ease; this has proven to be a big asset in aerospace, with their 100 hr. inspections.

4) Anti-extrusion: application where metal mating parts have gaps, flexible graphite will extrude into these gaps. Metal caps are utilized to prevent extrusion. Thickness of the metal depends on the pressure and the gap.

Tri-clad parts differ slightly from normal graphite design due to their metal sealing surface. Standard sealability charts can not be used. Refer to the following tri-clad styles and their appropriate sealing graph.

Single Cap: made with die molded or laminated die cut thermafoil, a single capped seal is used most often as a seat seal, body seal, or gasket. This type of seal must be placed into a groove and will follow a family of sealing curves based on the metal thickness.

 

Double Capped: much the same as a single capped, this type seal removes from groove areas and resist vibration.  Double capped seals also resist abrasion in twisting assemblies such as body seals and steam traps.

 

Single Cap Extra: same as single cap, but with the added feature of a Thermafoil top seal. By adding the top seal, the sealability of the capped part is improved by as much as 1000%

 

O-Ring: replacing metal type o-rings the tri-clad o-ring offers improved sealability while being more affordable.  Tri-clad o-rings are also easy to affix in a metal carrier to accommodate any bolt pattern.

 

Double Corner Caps: equal in sealability to the single cap extra, the double cap is designed for high volume production. This style also demonstrates a slightly higher compressibility than the solid single cap. Both seals provide good anti-extrusion characteristics.

 

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140 Parker Court, Chardon, OH 44024
 
 

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