metalsprincipally
Metalsprincipally is a term that appears to be a misspelling or a non-standard combination of words. In English, "metals" is the plural of metal, referring to a class of chemical elements characterized by properties such as high electrical and thermal conductivity, malleability, ductility, and a lustrous appearance. The word "principally" means mainly or primarily. Therefore, "metalsprincipally" does not form a recognized term in chemistry, materials science, or any other standard field.
It is possible that "metalsprincipally" is a typographical error for a phrase such as "metals principally used