Seamless brass tube Seamless brass tube is manufactured to the requirements of astm b 135 - standard specification for seamless brass tube and may be either round, square, or rectangular and is suitable for general engineering applications. It may be manufactured from any one of the following alloys: c22000, c23000, c26000, c27000, c27200, c27400, c28000, c33000, c33200, c37000, or c44300 and these alloys contain copper (cu) concentrations of between 60% and 90% with various percentages of zinc (zn), lead (pb), and tin (sn) permitted, depending on the alloy. Tubes meeting this standard may be furnished in any of several tempers ranging from light drawn to light annealed. It is the responsibility of the purchaser, when ordering to provide the requirements for alloy (uns#), temper, dimensions (diameter and wall thickness, or distance between parallel surfaces), form (straight lengths or coils), and total length or number of pieces of any particular size. Plastic bag or wooden case