seamless brass tube
Copper water tube is a seamless, almost pure copper material manufactured to the requirements ofASTM B 88 - Standard Specification for Seamless Copper Water Tube, of three basic wall thickness dimensions designated as types K, L, and M. Type K is the thickest and type M is the thinnest with type L being of intermediate thickness. All three types of tube are manufactured from copper alloy C12200 having a chemical composition of a minimum of 99.9% Copper (Cu) and Silver (Ag) combined and a maximum allowable range of Phosphorous (P) of 0.015 % - 0.040 %.
Seamless copper water tube is manufactured in sizes ¼" through 12" nominal. Types K and L are manufactured in drawn temper (hard) ¼" through 12" and annealed temper (soft) coils ¼" through 2" while type M is only manufactured in drawn (hard) temper ¼" through 12".
Seamless copper water tube of drawn temper is required to be identified with a color stripe that contains the manufacturer's name or trademark, type of tube and nation of origin. This color stripe is green for type K, blue for type L and red for type M. In addition to the color stripe the tube is incised with the type of tube and the manufacturer's name or trademark at intervals not in excess of 1½ ft. Annealed (soft) coils or annealed straight lengths are not required to be identified with a color stripe.
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