Materials

Metal reinforced graphite is a typical high temperature gasket material. Graphite can withstand temperatures from -200°C to +500°C. It also has an excellent chemical resistance against different mediums.

We recommend our own mica-based Micaseal Suniflex for even higher temperature requirements.

Usually, the best option is a PTFE-based fully structured sealing material with an appropriate filler system.

In basic applications you may use glass filled PTFE such as blue PTF,” but it is highly recommended to use enhanced and more structured materials.

PTFE itself has an excellent chemical resistance against almost all known mediums. You may use these materials from cryogenic temperatures up to +260°C.

We also recommend our own mica-based Micaseal Suniflex for highly demanding chemical requirements.

We have a wide range of gasket materials for sealing oil applications. Most of our rubber bonded fiber grades can chemically withstand oil.

Our recommendation for these applications is either NBR rubber bonded aramid or glass fiber. Rubber bonded fiber gaskets are recommended mainly for applications from -40°C to +150°C.

For high temperature oil applications, we recommend metal reinforced graphite.

Standard flat or flange gaskets can be manufactured from nearly any possible material e.g., fiber, graphite, plastics, many kinds of rubber, and PTFE based materials.

The material used depends on the media, pressure, and temperature of the application.

Proper assembly and material selection are very important. The gasket consists of a thin HNBR or FPM rubber layer and a metal body which is often made from cold-rolled steel or a stainless-steel layer that allows the seal to withstand high pressures and profile forming. This part can also be made of aluminium or brass.

The core material is typically stainless steel EN 1.4404 (AISI 316L), and surface layers are graphite.

However, depending on the application we can suggest other material combinations as well.

Just as an example, you might want to use EN 1.4541(AISI 321) core material and instead of graphite surface layers PTFE would seal better your media.

The core of the metal jacket gasket is made of a soft ceramic fiber or graphite. On top of the soft core, there is a metal shell, the material of which is chosen based on operating conditions and the hardness of the flange surfaces. Most commonly, a double-jacketed covering is used for easier handling and improved internal pressure resistance.

Pressed metal gaskets are most often made from highly temperature-resistant spring steel materials such as AISI 301, AISI 309, AISI 304 or AISI 316.

Various materials can be used in spiral wound gaskets. Carbon steel, AISI 304 (L), AISI 316 (L), Monel or Inconel are used for winding and the outer and inner rings. Graphite, PTFE, or Thermiculite are often used as the filler.

Most often the outer ring is made of carbon steel, winding and inner ring from AISI 316 (L), and the filler is graphite.

The most common material is EN 1.4571 (AISI 316ti).

We frequently manufacture the eyelets from EN 1.4828 (AISI 309), EN 1.4301 (AISI 304) and copper.

There are plenty of alternative materials depending on the application.

We provide a large variety of different rubber types, such as NBR, EPDM, FKM, silicone, and many more special compounds based on the use application.