Simrit E454 EPDM 80 durometer black O-Ring is engineered to deliver long-term sealing reliability in the most demanding hydraulic environments, while also providing dependable performance in standard industrial applications. Designed to minimize leakage, resist material breakdown, and maintain consistent sealing force, this O-Ring helps customers reduce downtime and extend service intervals.
Manufactured from peroxide-cured EPDM (ethylene-propylene rubber), the E454 compound offers superior heat stability, lower compression set, and improved aging resistance compared to sulfur-cured EPDM materials. With an 80 durometer hardness and black color, this O-Ring provides excellent extrusion resistance and dimensional stability. Its certification to National Aerospace Standard NAS 1613 Revision 5 confirms proven compatibility with phosphate ester hydraulic fluids, making it a trusted solution for both flight-critical systems and industrial fluid handling applications where EPDM is required.
Operating temperature: -40° to +225°F (–40° to +107°C)
Material & Performance Details
The E454 compound is a peroxide-cured EPDM formulation developed by Simrit and introduced in 2005 to meet the evolving needs of aerospace hydraulic systems. Unlike sulfur-cured EPDM, peroxide curing creates a more stable cross-linked polymer structure, resulting in improved long-term mechanical and thermal performance.
Benefits of Peroxide-Cured EPDM
- Lower compression set for longer sealing life
- Improved resistance to heat and thermal aging
- Better retention of physical properties over time
- Reduced risk of reversion in high-temperature environments
- Cleaner compound with improved consistency for critical sealing
Compound Details
- Material: EPDM (ethylene-propylene rubber), peroxide-cured
- Durometer: 80 Shore A
- Color: Black
- Density: Low density formulation optimized for aerospace hydraulic systems
Performance Strengths
- Excellent resistance to phosphate ester hydraulic fluids
- Outstanding resistance to ozone, weathering, and UV exposure
- Stable sealing force across wide temperature ranges
- Proven durability in long-term cyclic service
Chemical Compatibility
- Excellent resistance to:
- Phosphate ester hydraulic fluids (Type V)
- Water and hot water
- Steam
- Glycol-based fluids
- Alkalis and mild acids
- Limited capability with:
- Not compatible with:
- Petroleum oils and fuels
- Mineral oils
- Aromatic hydrocarbons
Sizes & Measurements
Available in NAS aerospace and standard O-Ring sizes.
- Cross Section (CS): varies by dash size
- Inside Diameter (ID): varies by dash size
- Outside Diameter (OD): varies by dash size
- Part Number: E454 EPDM series
- AS568 Dash Number: applicable where specified
- Aerospace Series: NAS-1611-XXXA and NAS-1612-XXXA (A-code)
Custom sizes available upon request.
Applications & Use Cases
Aerospace Applications
- Commercial aircraft hydraulic flight control units (primary and secondary)
- Hydraulic power units and pumps
- Aircraft braking systems
- Phosphate ester hydraulic circuits in flight-critical systems
These applications require seals that maintain integrity across extreme temperature swings, high-pressure cycling, and aggressive hydraulic fluids. Leakage in these systems is safety critical during taxi, take-off, cruise, descent, landing, and braking.
Standard and Industrial Applications
- Hydraulic and pneumatic systems using EPDM-compatible fluids
- Cooling water and heat transfer systems
- Industrial pumps and valves
- Equipment exposed to outdoor weathering and ozone
- Fluid handling systems requiring long service life and low maintenance
For non-aerospace customers, this means access to an aerospace-qualified, peroxide-cured EPDM compound that delivers exceptional durability in everyday industrial environments.
Key Specifications
- Material: EPDM (ethylene-propylene rubber), peroxide-cured
- Durometer: 80 Shore A
- Color: Black
- Certifications and Approvals:
- NAS 1613 Revision 5
- NAS-1611-XXXA
- NAS-1612-XXXA
- NF L 17-241 41B8
- Boeing approved
- Temperature Range:
- -40° to +225°F
- –40° to +107°C
- Pressure Rating: dependent on groove design and operating conditions
Why Buy from The O-Ring Store LLC
When customers source Simrit E454 EPDM O-Rings from The O-Ring Store LLC, they gain more than a compliant aerospace seal. They gain consistency, documentation, and responsive support.
- ISO9001:2015 certified quality processes
- USA-based inventory for fast delivery
- Same-day shipping on in-stock items
- Custom sizes and special orders available
- Full lot traceability and documentation on request
- Expert technical support from experienced sealing professionals
- Competitive pricing with no compromise on quality
Our customers benefit from fewer failures, faster sourcing, and confidence that the material selected is correct the first time. We make getting O-Rings easy.
FAQs
1. Why is peroxide curing important in EPDM O-Rings?
Peroxide curing improves heat resistance, reduces compression set, and enhances long-term aging performance. This results in longer service life and more stable sealing compared to sulfur-cured EPDM.
2. Can E454 EPDM O-Rings be used outside aerospace applications?
Yes. While certified for aerospace hydraulic systems, E454’s peroxide-cured EPDM compound performs exceptionally well in industrial, cooling, and fluid handling applications where EPDM compatibility is required.
3. Is E454 compatible with petroleum-based oils or fuels?
No. Like all EPDM materials, E454 is not compatible with petroleum oils or fuels. Material selection should always be based on the fluid media in use.
How Simrit E454 Peroxide-Cured EPDM Performs in Chlorinated Water and Chloramine (Not for NSF61 Applications)
Short answer:
This compound performs very well in chlorinated water and better than most elastomers in chloramine, especially because it is peroxide-cured EPDM.
Chlorinated Water (Free Chlorine)
Performance: Excellent
Peroxide-cured EPDM like Simrit E454 is one of the best choices available for systems exposed to chlorine-treated water.
Why customers benefit:
- Strong resistance to chlorine oxidation
- Excellent resistance to swelling and hardening
- Maintains elasticity over long service life
- Performs well in both cold and hot chlorinated water
This makes E454 a solid choice for:
- Industrial water systems
- Cooling loops
- Pumps and valves handling treated water
- Utility and infrastructure equipment
Chloramine (Chlorine + Ammonia)
Performance: Very Good to Excellent
And better than sulfur-cured EPDM.
Chloramine is more aggressive than free chlorine and is known to attack many elastomers over time. This is where peroxide curing really pays off.
Why peroxide-cured EPDM matters here:
- More stable crosslink structure
- Better resistance to oxidative chemical attack
- Slower degradation compared to sulfur-cured EPDM
- Lower compression set means longer sealing life
For customers, this means:
- Fewer premature seal failures
- Longer maintenance intervals
- Better reliability in municipal and reclaimed water systems
What E454 Is and Is Not Ideal For in Water Service
Excellent choice for:
- Chlorinated water
- Chloraminated municipal water (Not for drinking water)
- Hot water systems
- Steam and condensate
- Ozone-exposed outdoor water systems
Not recommended for:
- Petroleum-contaminated water
- Oil-in-water emulsions
- Systems with fuel or hydrocarbon carryover
Bottom Line for Customers
If a customer is asking:
“Will this survive chlorinated or chloramine water long-term?”
The honest, confident answer is yes, especially compared to:
- Buna-N
- Neoprene
- Sulfur-cured EPDM
- Many blended EPDM compounds
While E454 was developed and certified for aerospace phosphate ester hydraulics, its peroxide-cured EPDM chemistry makes it an excellent crossover material for water and municipal systems where reliability and long life matter.
From our side at The O-Ring Store LLC, the value is simple:
- You get an aerospace-validated compound
- With superior water chemistry resistance
- Backed by ISO9001:2015 processes
- And technical support to make sure it’s the right material before it ever goes into service
