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Glass-Cast™ 910 investment

  • 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

Need assistance with water/powder ratio calculations? Visit: Flask Calculators

Customer Testimonials 

​Al Heilman
"Great product and technical support."


Carol Christensen-Day
"I have already made several molds for glass casting and I really like this material. It's much easier to use than Castalot or plaster - and seems to produce very nice molds. I really liked the calculator for determining water and investment ratio. I'm mixing with a mixer on a drill - that works well. On one of 4 molds I made yesterday I tried to push the mold out of its plastic container too soon - and the mold cracked. The other 3, where I waited a bit longer were just fine. You may want to mention that letting mold set for at least 1/2 hour improves quality in your usage notes.​ Overall I found your usage notes very helpful but I am still learning some stuff on my own."​

Elena Wright | Custom Art Glass

"Investment removes cleanly. I loved using Glass-Cast 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!"

Dennis Gordon
"Great product."

James J. Kelley
"I am casting both glass and bronze on an artist level and this pushes the upper limits. Glass-Cast 910 never fails; it is strong and gives fabulous detail results every time. Stick to the water powder ratio carefully, make sure to use cold water."


Kate MacLeod | Kate MacLeod's Glass Art

"I had previously only used Glass-Cast 101 BANDUST and Glass-Cast 400 investments, but when I tried the Glass-Cast 910 investment, I was truly surprised by the ease of use and functionality of it. It is the most incredible casting material ever, and I doubt that I could find anything approaching it's equivalent if I embarked on the quest."


Matthew Day Perez | Matthew Day Perez

"The Glass-Cast 910 investment is fabulous! It is an exceptional product. I use it when teaching at various academic/creative institutions."


Terri Stanley | Terri Stanley Cast & Kilnformed Glass

"Of course I’m still casting glass with Glass-Cast 910 investment, and having wonderful results! The latest pieces have fragile areas with crisp lines and sharp edges. As always, Glass-Cast 910 investment worked perfectly for me. I've been telling all my students and glass friends about your products.”

Customer Art Gallery
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