[mtechserv]

Thanks for the input.

I've never used a tunnel gate in an aluminum mold before. I'm concerned that it will not hold up very long. I've used tunnel gates (.020" dia) in hard steel molds with no problems.
For my aluminum molds, I typically use 7075 or qc-7 alum. Typically, my aluminum molds are being used for flexible PVC. However, the mold requiring a tunnel gate will be used for Santoprene.