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GR-S Seals: Government Rubber-Styrene Sealing Solutions

How CTG Specializes in GR-S Seal Manufacturing

CTG brings decades of expertise to the manufacture of GR-S (Government Rubber-Styrene) seals, also known as SBR or Buna-S. Originally developed as a synthetic rubber alternative during World War II, GR-S has evolved into one of the most widely used elastomers in industrial sealing applications. Our advanced manufacturing processes ensure consistent quality and optimal performance across diverse applications.

What Are GR-S Seals?

GR-S seals, made from Government Rubber-Styrene (now commonly known as SBR), are synthetic rubber components featuring:
  • Historical significance as one of the first synthetic rubbers
  • Proven performance record in industrial applications
  • Cost-effective alternative to natural rubber
  • Excellent abrasion resistance
  • Good mechanical properties
  • Reliable aging characteristics
  • Consistent batch-to-batch properties
  • Wide processing window

Understanding GR-S Designation

The GR-S designation has historical significance:
  • GR = Government Rubber
  • S = Styrene type
  • Developed during the WWII synthetic rubber program
  • Now standardized as SBR (Styrene Butadiene Rubber)
  • Multiple grades available for different applications

Industries Served with GR-S Seals

  • Defense Contractors
  • Military Applications
  • Industrial Manufacturing
  • Automotive Production
  • Construction Equipment
  • Material Handling
  • Water Management
  • General Manufacturing

End Applications for GR-S Seals

GR-S seals excel in applications requiring:
  • Military specification compliance
  • Standard industrial sealing
  • Abrasion resistance
  • Water sealing
  • General mechanical goods
  • Non-oil-based fluid sealing
  • Vibration control
  • Weather sealing

GR-S Seals Frequently Asked Questions

What’s the difference between GR-S and SBR?
GR-S and SBR are the same material. GR-S was the original government designation during WWII, while SBR is the modern commercial name. Both refer to styrene-butadiene rubber.
GR-S offers an excellent balance of properties including good abrasion resistance, tear strength, and aging characteristics, making it ideal for general-purpose industrial applications.
Yes, our GR-S compounds can be formulated to meet various military and government specifications. Our quality system ensures compliance with required standards.
Like SBR, GR-S has limited resistance to oils and hydrocarbons. For oil exposure, we recommend alternative materials such as Nitrile (NBR) or FKM.
Our strict quality control processes, advanced manufacturing techniques, and extensive material knowledge ensure consistent, high-quality GR-S seals.

Technical Specifications

GR-S/SBR Properties:
  • Temperature Range: -40°F to 225°F
  • Good Abrasion Resistance
  • Moderate Tensile Strength
  • Excellent Cost/Performance Ratio
  • Good Aging Characteristics
  • Available in Multiple Durometers
  • Color Coding Options Available
  • Custom Formulations Possible

Quality Control Measures

Our GR-S seals undergo:
  • Raw Material Certification
  • In-Process Inspection
  • Final Dimensional Verification
  • Physical Property Testing
  • Custom Testing as Required
  • Full Lot Traceability
  • Material Certification Available

Experience the CTG Difference

Partner with CTG for your GR-S sealing needs and benefit from:
  • 24/7 emergency manufacturing capability
  • Expert engineering support
  • Comprehensive material testing
  • ISO quality management system
  • Rapid prototyping services
  • Competitive pricing
  • Quick delivery options
Contact our technical team today at 800.299.1685 or email ctgsales@ctgasket.com for expert guidance on your GR-S seal requirements.

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TECHNICAL LIBRARY

For available materials, sizing, geometry, gland considerations and more, view our technical library.
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24/7 Emergency Delivery Available
For urgent needs call 800.299.1685