Great advise going to steel Ultem is a creature. 10000 pieces would be a trick in aluminum. If it is glass or mineral filled I would go to H-13. Our shop makes most of our tools out of H-13 some P-20. I make them H-13 because the parting lines hold up so much longer for training process techs. I actually prefer H-13 and do not quote it any differently because of the faster moving machines with higher rpms. Tooling Engineer and Tool maker for almost 30 years.
Jetski (alias Tooling and Engineering Czar)
"I may not have the keys to success.. but I have learned to pick the locks"