• A staple in the glass casting community
  • Widely recognized as the strongest mold material available for glass casting on the market today
  • The glass caster's best choice for large pieces or configurations that will place significant stress on the mold material 

Package size: 50 pound

Current Stock:

Reviews Hide Reviews

910 investment

Al Heilman on 12th Nov 2018

Great product and technical support

Great Product

Dennis Gordon on 25th Jul 2017

Great product.

Investment removes cleanly

Elena Wright - Custom Art Glass on 16th Mar 2016

I loved using R&R 910 and was thrilled with how it withstood over 514 hours casting time for the 29 pound piece I just finished. I didn't use a flask for this application, but threw on layers, each colored a bit differently, and because I was scared of leakage, dipped fiberglass cloth pieces into the investment for one of the layers. The fiberglass layer was probably overkill. This work was planned for one-time use but with the strength of the mold, if it hadn't had so many undercuts, the material would have withstood more castings. It left a really clean finish on the glass and the only clean up I have to do is to clean up my mistakes which were many. I liked it so much I ordered 100 pounds more!