Your partner for metal jacketed gaskets

Your partner for metal jacketed gaskets

Proven in apparatus engineering - up to 550 ° C

Metal jacketed gaskets

Metal jacketed gaskets are proven sealing elements for use in apparatus construction, which are however increasingly being replaced at temperatures up to 550 °C by metal/soft-material gaskets, such as grooved gaskets.

At temperatures above 500 °C, such as in hot-blast areas, metal jacketed gaskets can still hold their own against solid metal gaskets such as weld ring gaskets.
Jacketed gaskets generally consist of a metal sheet coating with an insert of RivaTherm Super, graphite or FA1) or some layers of sheet metal. The metal sheet coating should be as soft and flexible as possible, but to prevent corrosion it is often made from a stainless steel jacket in 1.4541 or 1.4571 steel.

The harder the jacket, the finer the flange roughness needs to be. The inlay is selected according to the flange irregularities that need to be covered. The better the quality and the evenness of the sealing surfaces, the harder the inlay can be.

There is a wide range of possible combinations; the following are extremes at both ends:
very soft: Coating of aluminium, inlay of graphite
very hard: Coating of stainless steel, inlay of mica

Metal jacketed gaskets for heat exchangers are supplied with partitions in the model shown (picture 1).
Metal jacketed gaskets are also available as frames with rounded corners.

In flanges with tongue and groove or male and female face joints the jacketed gaskets should be fitted so that the tongue and/or the male face is against the smooth side of the gasket (picture 2).

ProfileCross-sectionDescription
F2

for flanges with raised face

F3

for flanges with raised face

F4

for flanges with raised face

F8

for flanges with raised face, mostly used in apparatus construction

F10

mostly used in apparatus construction

F12 
F17

for flanges with raised face, Profile F17 produces lower bolt loads and more favourable deformation behaviour than Profiles F3, F4, F8 and FW3

FW3
 
Profile
 
 
Gasket limiting values
 
   
Aluminium & Graphite
 
 
Cooper, Brass & Graphite
 
 
Iron, Nickel & Graphite
 
 
Stainless steel & Graphite
 
 
Iron & Iron
 
F2 bis F17 Recommended max. roughness (RZ) of the flange surfacesµmvon2512,56,32,5 
bis502512,56,3 
Surface pressure limits for 20°CN/mm²σv306070100 
σϑ100150180250 
Surface pressure limits for 300°CN/mm²ơσv(40)7080115 
σϑ(60)120150200 
FW 3Recommended max. roughness (RZ) of the flange surfacesµmvon  6,3  
bis  12,5  
Surface pressure limits for 20°CN/mm²σv  60  
σϑ  180  
Surface pressure limits for 300°CN/mm²ơσv  70  
σϑ  150  
F3LRecommended max. roughness (RZ) of the flange surfacesµmvon    6,3
bis    12,5
Surface pressure limits for 20°CN/mm²σv    200
σϑ    500
Surface pressure limits for 300°CN/mm²ơσv    200
σϑ    350