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EPDM: Peroxide-Cured vs. Sulfur-Cured
Curing system for EPDM materials
The advantages of EPDM O-rings lie in their excellent environmental resistance and long shelf life. The choice between peroxide curing and sulfur curing processes depends on the specific application of the O-ring; the differences in chemical stability, heat resistance, and tensile strength between the two curing methods will directly affect which process is more suitable for your application requirements.
Peroxide sulfidation and sulfur sulfidation
Peroxide-cured EPDM O-rings offer superior high-temperature resistance, with a continuous operating temperature up to 257°F (approximately 126°C), while exhibiting lower compression set. This type of seal can withstand a variety of harsh environmental media, including alcohols, brake fluids, ketones, hot water, and steam, with a maximum steam tolerance of 400°F (approximately 204°C). Furthermore, peroxide-cured EPDM O-rings exhibit good material compatibility and will not contaminate metal or PVC materials. In contrast, sulfur-cured EPDM O-rings offer higher tear and tensile strength, and are compatible with a wider range of fillers.
| Peroxide-Cured EPDM | Sulfur-Cured EPDM |
|---|---|
| Higher temperature resistance | Higher tensile strength |
| Lower compression set | Higher tear strength |
| Resistance to aging | Allowance for a wider range of fillers |
| Better resistance to chemicals and oils | |
| Does not stain PVC or metals |
Why choose peroxide-cured O-rings
KODA is a long-term supplier of peroxide-cured EPDM O-rings. They are favored for their wide operating temperature range, resistance to deformation after compression, and suitability for various applications. Whether you need peroxide-cured or sulfur-cured EPDM O-rings, please call +86 18730921709 or visit our EPDM O-ring page to submit an inquiry and contact us.