Among them, platinum, palladium and rhodium are mainly used as catalysts for redox reactions of carbon monoxide, hydrocarbons and nitrogen oxides in exhaust gases. This is platinum containing palladium and rhodium ternary alloy, there are PtPdRh33-6, PtPdRh38-5 and PtPdRh42-10 and other grades. PtPdRh33-6 and PtPdRh38-5 alloy for high temperature thermocouple positive material, oxidation resistance, high sensitivity. PtPdRh42-20 alloy for high temperature strain material.