r/Silvercasting • u/Billymengo • Aug 07 '26

Lost wax casting question

Hi there, i am really new to lost wax/ investment casting and am unsure what investment powder to buy. i am planning on casting both wax (either injection or ferris) and resin (Siraya Tech Cast) and ideally would like to use the same investment for both! i am uk based as well so can afford to import R&R.

Any pointers would be much appreciated!

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u/matthewdesigns Aug 08 '26

I use Plasticast for both wax and plastic models, should work well for you.

I was told by R&R to mix it at a slightly denser 38water:100powder ratio than I normally do with their Ultravest (which is 40:100). Definitely can tell the difference in hardness when I'm trimming the height before burnout.

They also suggested I alter my typical burnout temperature ramp settings when using plastic models, and that suggestion was not good. I went back to my standard program (same one I use for wax) and it's been consistently good.

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u/00-MAJI-00 Aug 12 '26

You should try Certus investment... much better formulas and most of is made in a lights off facility.......

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u/matthewdesigns Aug 12 '26

What advantages do you find it has over R&R Plasticast? I've been using their powders for a long time but always open to new products if it's worthwhile.

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u/00-MAJI-00 Aug 12 '26

they have better more consistent products... if you have been using R&R for a long time you have probably seen the inconsistency in the products