RWMA Class UNS No. ISO 5182 Designation EN12163
1 C15000 A2/4 CuZr CW120C
2 C18150 A2/2 CuCr1Zr CW106C
2 C18200 A2/1 CuCr1 CW105C
3 C17500 A3/1 CuCo2Be CW104C
3 C17510 A3/3 CuNi2Be CW110C
3 C17540 A3/4 CuCo1Ni1Be CW103C
3 C18000      
4 C17200 A4/2 CuBe2Ni CW101C
11   B10 W75Cu  
12   B11 W78Cu  
13 Tungsten B14 W  
14 Molybdenum B13 MO  
20 C15760 C20/1 CuAI2O3  

References:

  1. RWMA
  2. American Welding Society Publication J1.3
  3. ISO 5182
  4. UNS
  5. EN12163