Why Do Wuxi ChuncoTech Rubber’s O-Rings Maintain Seal Integrity Under 50 MPa Pressure?

In our last article, “Why Do Wuxi ChuncoTech Rubber’s Marine Fenders Survive Typhoons While Others Shatter?”, we showcased our marine expertise. Today, we focus on a component that seals the most extreme pressures: the O-ring. In hydraulic presses, deep-sea equipment, and high-pressure gas systems, an O-ring that fails at 50 MPa can cause catastrophic damage. Many standard O-rings extrude, tear, or leak under such conditions. Wuxi ChuncoTech Rubber manufactures ultra-high-pressure O-rings that maintain seal integrity where others fail. Here is why.

Hardness and Extrusion Resistance

Under 50 MPa, soft O-rings extrude into the clearance gap and tear. We use Shore A 90 hardness compounds for high-pressure applications, combined with backup rings to close the gap. Our HNBR and FKM materials maintain hardness at elevated temperatures—unlike standard NBR, which softens.

Compression Set: The Silent Killer

An O-ring that takes compression set loses sealing force. Our low-compression-set compounds (tested per ASTM D395) maintain shape after years of compression. For static high-pressure seals, we recommend peroxide-cured FKM—it achieves less than 15% compression set after 70 hours at 200°C.

Material Compatibility

Not all rubbers handle all fluids. NBR swells in brake fluid; EPDM fails in fuel. We match material to your exact media: FKM for high-temperature oils, HNBR for sour gas, PTFE-coated for aggressive chemicals. Our engineers analyze your operating conditions before recommending a compound.

Real-World Performance

A hydraulic press manufacturer was experiencing O-ring blowouts at 45 MPa. Standard 90 Shore A NBR failed within weeks. We supplied HNBR with backup rings. After 18 months, zero failures. The customer now specifies our O-rings for all their high-pressure assemblies.

Visit our website at https://www.chuncotechrubber.com/ to request a high-pressure O-ring consultation. Let us help you seal with confidence.