Er Erbium - Foil

The pure metal is soft and malleable and has a bright, silvery, metallic luster. As with other rare-earth metals, its properties depend to a certain extent on the impurities present. The metal is fairly stable in air and does not oxidize as rapidly as some of the other rare-earth metals. Most of the rare-earth oxides have sharp absorption bands in the visible, ultraviolet, and near infrared.

Melting point: 1529 °C Boiling point: 2868 °C

A foil is a thin sheet of pure metal. Given its fragile nature, some foils have protective coatings.