Using plaster-based molds for glass casting is an art. A variety of processes can be used to accomplish this feat, however, two are fairly common. The first process involves creating an open-faced mold using a pattern that can be physically removed. The second common practice is creation of an intricate mold that requires the removal of the pattern by heat or steam (lost wax casting).
The plaster-based mold material is mixed with the appropriate percentage of water. This slurry is then poured around the pattern and allowed to set or harden. After proper curing, the pattern is removed by pulling it from the mold, by steam removal, or by heat removal. After the pattern is removed, the glass can be placed in the mold. Again, the method of glass placement varies from artist to artist based on preference and experience.
Ransom & Randolph mold materials stand apart from other materials available due to their superior strength and detail reproduction, allowing for molds that resist cracking and minimize entrapped air. No matter which method of pattern removal is used, R&R’s products work exceptionally.
Below is an overview of the R&R GLASS-CAST mold material product line. At R&R, we have been serving glass casters worldwide for over 10 years and pride ourselves on providing casters with consistent, quality products and excellent customer service.