Ecoflux®* Corrugated Tube Heat Exchangers are normally manufactured in stainless steel AISI 304/316, depending upon the application. Other materials like stainless steel AISI 304L, AISI 316L, Carbon Steel, Copper and Copper Alloys (Cu-Ni, Adm. Brass, Naval Brass) and special materials like Duplex, Hastelloy, Titanium, etc. can also be offered.