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Here are some basic tips for casting optically clear resin parts. In this tutorial we cast Crystal Clear 202 urethane resin into a Mold Star 15 silicone mold to produce a UV resistant, optically clear casting. We also demonstrate how to properly vacuum de-gas the material before pouring, which will produce a bubble-free casting. In order to maximize the vacuum’s potential for air removal, the pump must be capable of pulling 29.6 inHg. Vacuum Degassing using the X-Vac™ Chamber When placed under pressure, any air bubbles entrapped from the mixing and pouring process shrink to the point where they are no longer visible.