Great read about the expectations of aluminum tooling for injection molding.
Aluminum tooling is an under utilized method of mold making when it comes to injection molding. IMPM has utilized aluminum tooling for over 20 years and has been able to fabricate molds at much lower cost and much shorter lead time than the competition. The article in the link above outlines how other companies have utilized aluminum tooling and benefited greatly. Definitely worth a read.