208 



TABLE 189.— COPPER WIRE— SPECIFICATION VALUES 



Copper wire: Hard-drawn (and hard-rolled flat copper of thicknesses corresponding 

 to diameter of wire). Specification values. (A. S. T. M. Bl-15, U. S. Navy Dept.) 

 Specific gravity 8.89 at 20°C (68°F). 



Note. — P-limit of hard-drawn copper wire must average 55 percent of ultimate tensile strength for 

 four largest-size wires in table, and 60 percent of tensile strength for smaller sizes. 



TABLE 190.— COPPER WIRE— MEDIUM HARD-DRAWN 



(A. S. T. M. B2-15) Minimum and maximum strengths. 



Note. — Representative values only from table in specifications are shown above. P-limit of medium 

 hard-drawn copper averages 50 percent of ultimate strength. 



TABLE 191.— COPPER WIRE— SOFT OR ANNEALED 



(A. S. T. M. B3-15) Minimum values. 



Note. — Experimental results show tensile strength of concentric-lay copper cable to approximate 

 90 percent of combined strengths of wires forming the cable. 



SMITHSONIAN PHYSICAL TABLES 



