Novus™ Sigraflex Hochdruck

PRODUCT TYPE: Graphite Laminate (Exfoliated Graphite)

Sigraflex Hochdruck is a Graphite Sealing Sheet with High-Integrity Stainless Steel Foil Reinforcement for Extreme Conditions. This multilayer high-strength sheet material comprises of 0.5 mm thick layers of high-quality graphite foil (type Z) and 0.05 mm thick stainless steel foil.


Sigraflex Hochdruck is produced specifically for applications requiring a high degree of purity in the laminate, such as the Nuclear industry.


Depending on the sheet thickness required, several layers of graphite and stainless steel foil are joined together in a special process.

SIGRAFLEX HOCHDRUCK is a sealing material with excellent mechanical properties.


For gaskets meeting increased demands on operational reliability and sealability, notably:

  • Requirements of the German Clean Air Act (TA Luft)
  • Blow-out resistance
  • Fire safety

For mechanically highly stressed sealed joints exposed to:

  • Very high gasket pressures of up to 400 N/mm2 (see material data)
  • Very high internal pressures of up to 250 bar

For gaskets in tongue-and- groove flanges meeting DIN and ANSI standards:

  • It is recommended that the bolts be tightened up to the permitted limit.
  • Recommended as one-piece gaskets up to 1500 mm outside diameter; over 1500 mm diameter as two- layer structures in segments.

Examples of application

Gaskets for:

  • Chemical and petrochemical pipework and equipment with hot and/or corrosive media
  • Steam pipework in power stations
  • Inspection glasses, pumps, fittings and vessels
  • Existing plants (after extended service).
  • Heat transfer oil and heating facilities




Specifically designed for use in low bolt-loaded irregular flanges. Typical flanges include glass lined, ceramic, plastic coated or uneven flanges.

Max Temp:

Oxidising media -200°C to 450°C

Max Pressure:

140 bar

Thickness Range:

1.5 mm; 2.0 mm; 3.0 mm; 4.0 mm

Sheet Size:

1000 mm x 1000 mm; 1500 mm x 1500 mm


Please view Specifications

How a Sigraflex Hochdruct gasket with eyelet works

Gaskets in this material with stainless steel eyelets make for much better sealability (see sketch below).