O-rings are one of the most widely used styles of seal geometries used today. Their uncomplicated design provides a suitable, cost-effective solution to a variety of sealing applications. O-rings can be used either as a seal itself or as the energizing element in a variety of PTFE, cap-type seals.

Greene Tweed’s extensive seal experience and superior quality is reflected in our ability to manufacture o-rings made from high-performance, elastomeric materials. A variety of unique compounds is available to meet our customers’ specific application requirements.

Sanitary Gaskets

Sanitary gaskets are used for fast and reliable connection of flanged tubes that periodically open, and are widely used in pharmaceutical, biotechnology, and aseptic processing. Their failsafe design eliminates inadvertent and incorrect installation and their non-sticky elastomer formulation enables fast and easy installation.

Custom Seals

Greene Tweed’s engineering team works collaboratively with its customers to custom-engineer sealing solutions to meet their specific equipment needs. Depending on the specific temperature, chemical, and mechanical conditions that the seal will experience, Greene Tweed engineers select the right materials and geometry to provide a lasting seal design.  Our unique processing capabilities allow very large diameter seals to be manufactured without any weak joints.

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Mechanical Seals

Greene Tweed solutions for mechanical seals enhance equipment reliability, reduce maintenance, and lower total cost of ownership. Greene Tweed combines its broad range of high-performance elastomeric materials, including Chemraz® FFKM and Fusion™ FKM, and thermoplastics such as Avalon® and Arlon®, to design secondary seals used in mechanical seals that help eliminate process contamination and significantly reduce maintenance.

Metal Spring Energized (MSE®) Seals

Greene Tweed’s MSE® seal is made of precision-machined PTFE, filled PTFE, or other high-performance polymers, energized by a corrosion-resistant metal spring or an elastomeric o-ring.

When seated in the gland, the metal spring or o-ring energizer is under compression, applying force on the gland sealing surfaces and, thereby, creating a tight barrier to prevent gas or fluid from leaking.

While spring force provides adequate sealing force at low pressure, at high pressure, the system pressure augments the spring force to provide an even tighter seal. The spring also provides resiliency to compensate for seal wear, gland misalignment, and eccentricity.

Greene Tweed’s design experts partner with customers when choosing from more than 100 seal materials, a variety of spring materials, and three standard spring designs. The expertise of Greene Tweed’s design team ensures that our customers select the best combination of materials and design to meet and exceed their application requirements.

Features and Benefits

  • Chemically inert for virtually unlimited chemical compatibility
  • Low friction for smooth & consistent breakout and running friction; low power absorption & torque requirements; can run dry or lubricated
  • Wide temperature range – -422°F to 600°F (252°C to 315°C); wide pressure range for vacuum/pressurized systems (up to 60,000 psi)


Sealing SystemsFFKM, FKM, FEPM

Chemraz® (FFKM)

  • Chemraz® 504
  • Chemraz® SD505
  • Chemraz® SD517
  • Chemraz® SD585
  • Chemraz® SD605
  • Chemraz® SD625

Fluoraz® (FEPM)

  • Fluoraz® SD890

Fusion (FKM)

ThermoplasticsPEEK, PTFE

Arlon® (PEEK)

Avalon® (PTFE)