Standard Specification for Platinum Sponge

Element (max.ppm)  
Pt (% min.) 99.95%

Au

10
Ag 10
Pd 10
Ir 10
Rh 10
Ru 9
Os 15
Al 5
As 20
B 5
Bi 5
Ca 5
Cd 5
Co 5
Cr 5
Cu 10
Fe 5
Mg 5
Mn 5
Mo 5
Ni 5
Pb 5
Sb 10
Si 10
Sn 10
Ti 5
W 5
Zn 5
Zr 5