SIGRAFLEX® HOCHDRUCK sheets and gaskets

Products for static sealing applications
in the chemical and petrochemical industry

Graphite foils, graphite sheets and packing yarns


SIGRAFLEX® APX2 HOCHDRUCK sheets and gaskets

Our SIGRAFLEX® products made of expanded flexible graphite have proven their long-term reliability under extreme operating conditions over the course of many years. Therefore, leading companies in the chemical and petrochemical industry, in the pulp and paper industries as well as power plant operators rely on the superior quality of our sealing products and utilize them successfully.

SIGRAFLEX is resistant to most chemical media and sets itself apart from other asbestos substitutes thanks to the long-term stability of its sealing properties – even at temperatures of up to approximately 550°C (1,022°F).

Our SIGRAFLEX product portfolio is one of the largest on the market. Our materials meet virtually all technical requirements of the international chemical and petrochemical industries. Seals made of SIGRAFLEX foil and reinforced sheets offer major advantages:

  • Higher long-term sealing standards
  • Enhanced process reliability and material dependability
  • Compliance with statutory requirements for fugitive emission levels
  • Lower maintenance expenses thanks to the sealing materials’ long service life

Our SIGRAFLEX® graphite foils and sheets

Various products made of SIGRAFLEX® foil

SIGRAFLEX flexible graphite foil stands out thanks to its exceptional resistance to extreme temperatures. It is the first choice for sealing applications for long-term use at high temperatures – particularly in the petrochemical industry.

The refinery business also calls for sealing materials with guaranteed dependability including maximum oxidation resistance, even in extreme temperature applications. SIGRAFLEX APX2 foil oxidizes much more slowly than comparable products, even at 593°C (1,099°F) and significantly extends gasket service life, increases process reliability and reduces costs on the long term.

SIGRAFLEX® BTCSS and BSSC graphite sheets

Our SIGRAFLEX sheet portfolio comprises non-reinforced (SIGRAFLEX STANDARD), reinforced, and impregnated graphite sheets. They can be reinforced with a variety of different inserts such as tanged stainless steel sheets, flat stainless steel foils or polyester films. Special impregnation improves the sheets with greater strength and gas tightness and gives them exceptionally scratch-resistant and non-stick surfaces.

Schematic structure of our reinforced sheets

SIGRAFLEX packing yarns

SGL Group’s SIGRAFLEX carbon and graphite packing yarns are used worldwide in high-temperature and high-pressure braided packing applications.

Our product portfolio covers a wide variety of SIGRAFLEX yarns, several different coatings and sizings can be added to aid in handling, braiding and to effectively inhibit corrosion. SIGRAFLEX yarns provide many advantages exceeding e.g. the performance of organic fibrous materials:

  • Good thermal conductivity
  • Outstanding chemical and thermal resistance
  • High degree of purity
  • Good mechanical strength
  • High compressibility and flexibility
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