Robuta

https://store.astm.org/b0359_b0359m-02r06.html B359/B359M Standard Specification for Copper and Copper-Alloy Seamless Condenser and Heat Exchanger... standard specification for copper https://store.astm.org/b0359_b0359m-15.html B359/B359M Standard Specification for Copper and Copper-Alloy Seamless Condenser and Heat Exchanger... standard specification for copper