RTV Silicone and Polyurethane Resin.

[TheRocketNerd]

I've been wanting to cast my own parts for some time now, and even though my rocketry funds are lower than ever, I figured while I had the time, I'd ask this question.

I've looked for the exact type of RTV Silicone that moldin oldies uses, but am not sure exactly what he uses since there's only about 8,037 different types of mold silicone and the same goes for the resin. I'm NOT looking to reproduce any of what is currently being sold by Sirius/Moldin Oldies--I'm looking to make some replicas of some of my favorite yet expensive to buy and impossible to find cones. I know the overhead will be steep, but I'm still interested since maybe I could sell a few if someone else needed a replacement cone.

Anyway, info on the specific brand MO used, or a brand that you've found to work well will be appreciated. I've got a box fan motor all primed for a gear reducer to make the "centrifuge" needed, just need a smaller motor that can be mounted inside the frame to spin the molds the other way.

TIA!

 

[TheRocketNerd]

If anyone knows how to get in contact with Mike, that information would also be very useful and answer my question. Surely someone has an email address for him. :confused2:

 

[JimmyL]

Try this web site. It has complete how to on casting nozzles using silcone rubber. Hope this helps.
https://www.rocketrytoday.com/nozzle.html

 

[InFlight]

The Smooth-on OOMOO stuff shrinks really bad. Don't use it for nose cones.

Polytek 74 and 75 are a better choice
https://www.bare-metal.com/Polytek-75-Series-Polyurethane-Mold-Rubber.html

Then build a Rotomold Machine

.

 

[stantonjtroy]

Try looking here: https://www.vandykestaxidermy.com/category/molding. They supply to the taxidermy market but the moulding and casting mediums are the same. You can also look here: https://www.smooth-on.com/ and https://www.micromark.com/SearchResult.aspx?deptIdFilter=0&searchPhrase=RTV

FWIW
Troy

 

[TheRocketNerd]

Thanks for the help everyone... I've got a phone appointment with someone quite knowledgeable on the topic so I'll see what he has to say... Then, brace yourself for more questions!!! I'm looking at the Polytek at present.