Discover quality.

Discover quality.


SIGRAFLEX® HOCHDRUCK is a multilayer high-strength graphite sealing sheet comprising 0.5 mm thick layers of high-purity graphite foil and 0.05 mm thick stainless steel foils.

Depending on the sheet thickness required, several layers of graphite and stainless steel foil are joined together in a patented adhesive-free process. As a result, the sheets have outstanding mechanical properties. The sealing sheet is impregnated to reduce leakage and improve handling.

SIGRAFLEX® HOCHDRUCK allows end users in the process industry to cover almost their entire gasket application range with a reliable and safe product.

Areas of application

  • For difficult and mechanically highly stressed sealed joints (in tongue-and-groove and special-dimension flanges, process equipment, heat exchangers); also suitable for all common pipework and vessel flange designs.
  • Recommended for one-piece gaskets up to 1500 mm outside diameter; for diameters over 1500 mm as two-layer structures with segmented sections and staggered joints, for instance.
  • For high internal pressures of up to 250 bar
  • For corrosive media
  • Suitable for a broad range of temperatures from -250°C to approx. 550°C; for appli- cations at more than 450°C, users should request our advice
  • Gaskets for the chemical, petrochemical and refinery industries
  • Steam pipework and boilers in power stations
  • Heat transfer from oil and heating facilities


  • Reduction in fugitive emissions due to very high leak-tightness
  • Very high maximum permissible gasket stress
  • High operational reliability and excellent oxidation resistance
  • High blow-out resistance and very high mechanical strength
  • Very high fault tolerance during assembly and operation
  • Good chemical resistance
  • Long-term stability of compressibility and recovery, even under fluctuating temperatures
  • Good scratch resistance; anti stick finish due to special impregnation
  • No measurable cold or warm flow characteristics up to the maximum permissible gasket stress
  • No aging or embrittlement, owing to the absence of adhesives or binders
  • Ease of processing
  • Asbestos-free, no associated health risks


  • TA Luft (VDI 2440/VDI 2200) with inner eyelets in various designs; for tongue- and-groove flanges without eyelets
  • Fire safety according to BS 6755-2 and API 607
  • Blow-out resistance (TÜV at 2.5 times the nominal pressure)
  • BAM oxygen
  • BAM ethylene oxide/propylene oxide
  • Germanischer Lloyd
  • DVGW (DIN 3535-6)
  • TRD 401

Dimensions of the standard sheets

Dimensions in mm
1500 x 1500 x 1.0V100
1500 x 1500 x 1.5V150
1500 x 1500 x 2.0V200
1500 x 1500 x 3.0V300
1500 x 1500 x 4.0V400
  • The sheets can also be supplied in dimensions of 1000 x 1000 mm.

For more information about COVID-19 please visit: COVID-19 Corona Virus South African Resource Portal