| Quantity: | |
|---|---|
Peroxide cured EPDM (Ethylene Propylene Diene Monomer) O-rings are advanced sealing components manufactured using a peroxide vulcanization system. This process employs organic peroxides like dicumyl peroxide and benzoyl peroxide, combined with co-crosslinking agents such as TAIC (Triallyl Isocyanurate), to form a stable three-dimensional network structure. Unlike sulfur-cured EPDM, peroxide-cured variants exhibit superior heat resistance (up to 150°C for continuous use and 200°C for short-term exposure) and enhanced chemical stability, making them ideal for applications requiring long-term durability in harsh conditions.
With a working temperature range of -55°C to 150°C, these O-rings maintain flexibility and sealing integrity across extreme thermal gradients. The peroxide curing process significantly reduces compression set, ensuring minimal deformation even after prolonged exposure to high temperatures.
Peroxide-cured EPDM O-rings excel in resisting polar solvents (e.g., alcohols, ketones, ethylene glycol-based brake fluids) and aqueous media (e.g., hot water, steam, dilute acids/bases). They are widely used in automotive braking systems and industrial machinery where contact with aggressive chemicals is frequent. However, they are not recommended for use with mineral oils, fuels, or aromatic solvents.
The saturated hydrocarbon backbone of EPDM provides inherent resistance to ozone, UV radiation, and oxidative degradation. In accelerated testing (50pphm ozone, 30% elongation), these O-rings remain crack-free for 150+ hours, ensuring outdoor service life exceeding 25 years. This makes them a preferred choice for architectural seals and outdoor industrial equipment.
The peroxide vulcanization process creates a denser crosslinked network compared to sulfur curing, resulting in higher tensile strength and improved abrasion resistance. This structural stability translates to reduced wear in dynamic applications, such as automotive suspension systems and industrial pumps.
With a volume resistivity of ~10¹³ Ω·cm (significantly higher than conventional EPDM), these O-rings offer reliable electrical insulation for components like transformer bushings and cable connectors.
Property | Specification |
Hardness | Shore A 40–90 (customizable) |
Temperature Range | -55°C to 150°C (continuous); up to 200°C (intermittent) |
Ozone Resistance | 50pphm, 30% elongation, 150+ hours without cracking |
Compression Set | ≤15% at 150°C after 22 hours |
Tensile Strength | 10–18 MPa |
Elongation at Break | 200–350% |
Brake Systems: Resistant to DOT 3/4/5.1 glycol-based brake fluids and hydraulic oils.
Engine Components: Used in radiator hoses, valve stem seals, and turbocharger gaskets, enduring 150°C+ under the hood.
Suspension Systems: Provide vibration damping and chemical resistance in shock absorbers.
Waterproofing: Mixed with asphalt for roofing membranes and bridge expansion joints, offering 25+ years of outdoor durability.
Window/Door Seals: Resist UV degradation and temperature fluctuations, ensuring airtight and watertight barriers.
Plumbing Fixtures: NSF/ANSI 61-certified variants are approved for potable water systems, demonstrating chloramine resistance in municipal water treatment.
Valve Seals: Withstand acidic/alkaline solutions and high-pressure steam in chemical processing plants.
Pumps & Compressors: Maintain sealing efficiency in glycol coolants and phosphate ester hydraulic fluids.
Food & Beverage: FDA-compliant grades (CFR 21 §177.2600) ensure safety in contact with food-grade oils and cleaning agents.
Insulation Components: Used in transformers, switchgear, and cable terminations, offering high dielectric strength and resistance to moisture.
Aerospace: Resist ozone in high-altitude conditions and extreme temperatures in aircraft fuel systems.
Marine: Withstand saltwater corrosion and UV exposure in shipboard piping and hatch seals.
Feature | Peroxide-Cured EPDM | Sulfur-Cured EPDM |
Temperature Resistance | 150°C+ continuous use | 125°C continuous use |
Chemical Resistance | Excellent against chloramine, steam, and polar solvents | Limited resistance to aggressive chemicals |
Compression Set | ≤15% at 150°C | ≤25% at 125°C |
Surface Finish | Non-staining, suitable for PVC and metal interfaces | May cause discoloration on certain materials |
Longevity | 25+ years in outdoor applications | 10–15 years in similar conditions |
Lixu Rubber specializes in producing peroxide-cured EPDM O-rings with precision and scalability:
Automated Production: 14 rubber vulcanization robots and 8 optical inspection machines ensure consistent quality.
Extensive Molding Options: Over 10,000 molds covering AS568, ISO 3601, JIS, and metric standards, with ID ranges from 1mm to 400mm and cross-sections from 1mm to 30mm.
Testing & Certification: Products undergo rigorous testing for hardness, tensile strength, aging, and oil resistance. Certifications include REACH, ROHS, FDA, and NSF/ANSI 61 for potable water applications.
Global Reach: Exported to North America, Europe, Asia, and the Middle East, with fast delivery supported by automated logistics.
Lixu Rubber offers tailored solutions for unique requirements:
Material Formulations: Custom compounds for FDA compliance, flame resistance, or low-temperature flexibility.
Post-Cure Treatments: Secondary vulcanization in ovens enhances dimensional stability and reduces residual stress.
Engineering Assistance: Expert guidance on material selection, installation, and failure analysis.
Peroxide cured EPDM O-rings represent the pinnacle of sealing technology, combining unmatched chemical resistance, broad temperature compatibility, and long-term reliability across diverse industries. Whether for automotive engines, industrial pipelines, or drinking water systems, these O-rings deliver cost-effective performance without compromising safety or durability.
Contact Lixu Rubber today to explore how our peroxide-cured EPDM solutions can optimize your applications. With advanced manufacturing capabilities and a commitment to innovation, we are your trusted partner for precision rubber sealing.
