There is no such thing as a 99.99% pure copper sink, The only Copper Alloy that is that pure is considered “Commercially Pure” C12200, and that is 99.92 – 99.97 pure copper. The problem is that copper that is solid copper or that pure, causes problems in TIG welding and the metal spinning process which is a step in the process of manufacturing copper sinks.
Our copper sinks are comprised of approx. 97% pure copper with the trace addition of Zinc and Phosphorus. The two additional elements are beneficial in the durability of a copper sinks, and it helps in the manufacturing process of the sinks. In the smelting process, the laminadora specifically adds Zinc to the batch. The Phosphorus is typically already included in the copper, due to the fact the copper scrap, plumbing pipes, wire, ect, all are made with an Alloy of copper that contains Phosphorus for additional durability.
Our products are much different then others been sold in the US. We have had our shop IAPMO certified, and we also only use certified SEMARNAT materials. SEMARNAT, is the environmental agency that inspects and certifies smelters or what are called “Laminadoras” in Mexico. Laminadora Patzcuaro, where all of our raw materials are produced, is the only smelter that is certified and is annually inspected by the Mexican version of the EPA to ensure low emissions, and to ensure they are environmentally friendly.
Their Certification is posted here: