Rubber Steel

Rubber Steel

Rubber-steel gaskets [G-ST] are used in bolted connections in which only low bolting forces can be realised. The elastomer properties allow on the one hand a very good adjustability to the sealing surface, on the other hand low leakage rates are achieved due to the homogeneous structure. The use of a centrally fitted, corrosion protected and vulcanised steel insert increases the blow-out resistance and stability. Therefore, the gasket is easy to handle even at large nominal widths. Extreme adhesion between steel insert and the rubber jacketing is ensured due to the vul¬canisation. No moving, removal or even blow-out is possible even at the highest stress loads. The gaskets have a wide range of applications depending on the relevant elastomer and are suit¬able for water, water vapour, gas, air, acids, bases, hydrocarbons whilst application temperatures of up to 200 °C are possible. Rubber-steel gaskets [G-ST] are manufactured in various shapes according to the application area and the specified flange material [e.g. steel, FRP] and can be used in off- load and main load applications.

  • GS01: G-ST flange gaskets, universal application [main load]
  • GS10: G-ST-P/S, universal application, ideal for flange connections made from steel-plastic and cast-plastic [main load]
  • GS20: G-ST-P/0E, flexible design gasket with visible stainless steel insert [main load]
  • GS30: G-ST-P/K, ideal for flange connections made from pairs of plastic compounds [main load]
  • GS50: G-ST-P/KN, universal application, ideal for partially covered flanges and extreme stresses [off load]

The combination of G-ST-base body and 0-Ring at the inner diameter combines the advantages of the individual elements. The sealing ring located at the force bypass clings perfectly to the sealing surface even at low surface pressures. Uneven areas and score marks, even slight adjustment tolerances are com¬pensated. An hitherto impossible operational safety is ensured in addition to material-efficient assembly at only low necessary tightening torques. Rubber-steel gaskets comply with TA Luft when adhering to the maximum installation surface pressure.


  • High gas and liquid tightness even at low surface pressures
  • Compensation for surface defects, very good elasticity and good recovery behaviour
  • Flange and bolts can be of a weaker design
  • Lifespan of plastic flange connections is significantly higher [consideration of the creep test behaviour]
  • Good compensation behaviour in the event of angle deviations
  • Complies with TA Luft 2002 [VDI 2LIL10/2200] leakage requirements
  • Blow-out resistant following TRBS 2152 part 2
  • Very good handling during transport, installation and dismantling, mechanically stable
  • Individual marking of each gasket at the outer edge
  • Grooves for the sealing ring or offset-grooves on the flange are not neccessary [G-ST-P design]


  • Gaskets for pipeline flanges, device and container flanges
  • Gas/water pipeline construction
  • Vacuum
  • Plastic pipelines
  • Rubberised flanges
  • Connections sensitive to stress [e.g. glass flanges]

Product range

  • Dimensions as per DIN EN 151LI-1, DIN 2690, DIN16962 part LI, DIN16963 part LI and ASME 16.21
  • GS01 | Rubber-steel gasket
  • GS101 | Rubber-steel gasket with 0-ring seal
  • GS20 | Flexible design Rubber-steel gasket with 0-ring seal and visible stainless steel insert
  • GS30 | Rubber-Steel gasket with 0-Ring seal and visible VA insert

Additionally: IN Profile Overview I GS series


Manufacturer, Design, Nominal width, Pressure stage, Manufacturing date, Certificates, Hardness of the elastomer

Sealmax has now tied up with KWO and IDT Germany for marketing their product range in India