Tevila – Aluminum

Igros Moshe (YD III #22) Question: Do Aluminum utensils require Tevila Answer Aluminum is a new type of metal which is not mentioned in the Torah and thus it would seem that it doesn’t require tevila.  The verse about tevila mentions only 6 types and doesn’t say all metals reqire tevila.  Similarly while glass doesn’t require tevila according to the Torah but the Rabbis decreed it requires tevila but not because it is like metal but because it is like pottery.  Thus not all metals require tevila but only those specified by the Torah. However I think it needs tevila on a rabbinic level like glass.