B370 is 99 pure copper and is often referred to by different numbers by different manufacturers as part of branding but don t let that confuse you.
Copper sheet astm b 370.
Astm b 370 09 specification for cold rolled copper sheet and strip for building construction pdf download item.
Astm b370 is commonly referred to as other brand names or as roofing copper.
Commonly referred to as roofing copper this sheet is certified to the astm b 370 specification and is 99 pure copper.
Copper sheet astm b370 also known as roofing copper provides high ductility durability and corrosion resistance.
B370 will naturally patina with age.
It will develop a green patina with time.
Astm b370 2019 edition 2019 standard specification for copper sheet and strip for building construction this specification establishes the requirements for rolled copper sheet and strip in flat lengths or coils in ounce weight thicknesses for roofing flashing gutters downspouts and general sheet metal work in building construction.