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PTFE Stainless Steel LNG Cryogenic Spring Energized Seal. Superior Corrosion Resistance: PTFE matrix and nickel-based springs resist H2S, CO2, and various corrosive chemicals. Low Friction Coefficient: Self-lubricating PTFE reduces operating torque and eliminates valve stem sticking. Long Service Life: Excellent anti-fatigue and anti-wear performance significantly reduces maintenance costs. Flexible Customization: Customizable pressure levels, temperature ranges, and groove dimensions available. International Standard Compliance: Meets AS4716, JIS B2401, MIL-G5514F, DIN3771, ASTM D2000, ISO3302, and ISO2768.