ORIGRAF® Expanded Graphite Seals: Engineered for Reliability and Efficiency

Maximize safety, performance and long-term value with ORIGRAF® die-formed expanded graphite seals from Technetics.

Designed to outperform in extreme thermal and pressure cycling environments, ORIGRAF® seals deliver:

  • Superior sealing integrity under fluctuating conditions
  • Enhanced operational safety
  • Reduced maintenance and downtime
  • Optimized total cost of ownership

Whether you’re operating in high-temperature, high-pressure or chemically aggressive environments, ORIGRAF® seals provide the durability and consistency for your critical systems demand.

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Why Choose ORIGRAF® Expanded Graphite Seals from Technetics Group?

ORIGRAF® die-formed expanded graphite seals are engineered to deliver exceptional sealing performance in the most demanding environments — where conventional solutions often fall short.

Unlike standard graphite gaskets or competitor expanded graphite seals, ORIGRAF® seals offer superior adaptability and resilience. Thanks to our proprietary manufacturing process, the graphite structure maintains flexibility, allowing the seal to conform to surface irregularities — even under offloading or transient conditions. This ensures consistent, leak-tight performance where others may fail.

What Makes ORIGRAF® Stand Out?

  • Controlled Compression
    Unlike flexible graphite-cut gaskets or spiral-wound gaskets, ORIGRAF® seals are designed with mechanical stops — such as precision-engineered grooves or inner/outer rings — that limit compression. This prevents overloading and protects the seal during thermal and pressure fluctuations.
  • Superior Stress Management – Built for Critical Applications
    The design minimizes excessive sealing stress, preserving seal integrity and extending service life when assemblies are subject to high-pressure, high-temperature environments. ORIGRAF® seals are trusted in industries where safety, reliability and performance are non-negotiable — from energy and chemical processing to aerospace and defense.

Choose ORIGRAF® for a smarter, safer and more cost-effective sealing solution — engineered to reduce maintenance, improve operational safety and lower your total cost of ownership.  Outperforming other manufacturers in real-world conditions. 

Key Features of ORIGRAF® Expanded Graphite Seals 

Engineered for performance in the most demanding environments, ORIGRAF® expanded graphite seals offer a unique combination of resilience, adaptability and ease of use: 

  • Exceptional Elastic Recovery
    Achieves up to 40% compression recovery, delivering a reliable spring-back effect for long-term sealing performance (characterized in our MAESTRAL Laboratory).
  • Low Creep and Relaxation
    Maintains dimensional stability under critical pressures and temperatures, reducing the need for retightening.
  • Radiation and Chemical Resistance
    Ideal for nuclear and chemical processing applications, with excellent resistance to harsh media and radiation exposure (specific nuclear graphite grades on request — for instance, PMUC).
  • Thermal and Pressure Adaptability
    Performs reliably under extreme temperature and pressure fluctuations, ensuring consistent sealing in transient conditions.
  • Metal-to-Metal Contact Design
    Enhances structural strength and ensures consistent seating load control.
  • Insensitive to Asymmetric Bolt Tightening
    Maintains sealing performance even when assembly torque is uneven — reducing installation errors and improving reliability.
  • Non-Adhesive to the Flanges Contact Surfaces
    Usually does not bond to flanges, making removal and replacement quick and damage-free during maintenance.

Industries & Applications

ORIGRAF® expanded graphite seals are trusted across a wide range of high-demand industries where safety, reliability and performance are critical:

Industries Served:

  • Nuclear Power & Research
  • Chemical Processing
  • Petrochemical & Refining
  • Oil & Gas Exploration & Production

Common Applications:

  • Steam Generators & Pressurizers
  • Manholes & Other Critical Maintenance-Related Openings
  • Heat Exchangers
  • Piping Flange Connections
  • Valves & Pumps
  • Critical Flange Assemblies

Technical Specifications & Certifications

Engineered for extreme environments, ORIGRAF® seals deliver consistent performance under the most challenging operating conditions:

  • Pressure Resistance: Up to 400 bar (5,802 PSI)
  • Temperature Range: From -321°F to 4,532°F (-196°C to 2,500°C)
  • Standard Sizes:
    • DN: 15 to 600 mm (NPS: 1/2” to 24”)
      Up to 1,500 mm (59”) on special request
    • Pressure Classes: CLASS 150 to 2500 / PN 20 to 420
  • Certifications:
    • PMUC Certified by EDF (No. PMUC 17-0174)
    • BAM Certified for use in oxygen-rich and high-risk environments

ORIGRAF® ON 002 Gaskets

Designed for compatibility with a wide range of flange types and standards:

  • Suitable for flat-faced (FF) and raised-face (RF) flanges
  • Supports single insertion (SE) configurations
  • Compliant with NF-EN 1092-1 and NF-EN 1759-1 (ASME/ANSI B16.5) standards

Looking for a sealing solution that meets nuclear-grade standards and performs under extreme conditions?

ORIGRAF® seals are engineered to deliver maximum safety, minimal maintenance and long-term reliability — making them the preferred choice for engineers in the world’s most demanding industries.

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