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DN500-5000mm Round Type Metal Expansion Joint. Wide Size Range: Available in DN500 to DN5000mm round type configurations. High Temperature Resistance: Designed for high and mid-temperature hot air ducts and exhaust gas pipes. Vibration Resistance: Ideal for high vibration ducts with excellent flexibility. Proven Reliability: Stable quality provided to hundreds of steel works since 1993. Standard Compliance: Designed according to EJMA latest version and GB/T 12777-2008. Corrosion Resistance: Offers superior corrosion resistance for harsh industrial environments. Long Cycle Life: Engineered for super cycle life in demanding applications. ISO and CE Certified: Certified with ISO, CE, and ISO9001 standards.