Palladium: symbol Pd, mainly made of natural cymbals. The color is silvery white, the appearance is similar to platinum, and it has metallic luster. Melting point 1555℃, hardness 4 ~ 4.5, relative density 12, lighter than platinum, stronger in ductility and slightly harder than platinum (hardness' Mohs' palladium 4.8, platinum 4.3). Chemical properties are relatively stable, insoluble in organic acids, cold sulfuric acid or hydrochloric acid, soluble in nitric acid and aqua regia. Under normal circumstances, it is not easy to oxidize and lose luster.

The seal of palladium and platinum jewelry in the world is Pd or palladium, which is expressed by a few thousandths of purity. For example, Pd900 indicates a purity of 900‰. In Japan, the specifications of palladium and platinum jewelry are Pd 1000, Pd950, Pd900 and Pd850.

The purity of PT990 is 99%.

The industrial consumption of this thing is not very large, nor is it very rare, so the price is very cheap, but the price is slightly higher after processing.

And the price of this thing is set by the merchant himself. Be careful when buying.