Platinum is a chemical element with symbol Pt and atomic number 78. It is dense, malleable, ductile, highly unreactive, precious, gray-white transition metal.
P 3343 (OTTO) Platinum wire, 0.55 mm dia, 99.9%+ Cas 7440-06-4 - used in many applications including chemical catalyst, thermocouples, electrical contacts, flame test and heater coils.