Last Updated: Nov 20, 2016 Views: 22
I apologize for my delay in answering your question about possible furnace/crucible sources near Portugal:
I checked with our Studio, but they did not have suggestions for me.
This directory for the glass industry provided some possibilities (I am not familiar with the firms):
You might ask schools in the vicinity where they obtain their crucibles:
This firm came up in an internet search:
Please let me know if I can help you again.