Casting Materials

Pressure Casting-Tech

When casting parts, air entrapment is always a concern for the model maker. Entrapped air between the mold surface and the casting resin results in tiny pinhole bubbles on the part’s surface. For light bubble-trouble, usually dusting the mold with a fine powder (i.e., thermolite, talc powder) prior to pouring resin will normally prove adequate. But for highly detailed and intricate molds, many veteran and professional model makers utilize a combination pressure casting system and mold dusting.

Pressure Casting systems consist of a paint/pressure tank and an air compressor. It functions by providing positive pressure (60-80 psi) to an entire mold and its contents during curing of the resin---virtually eliminating entrapped air from the resin. Pressure may be relieved when gel time of resin is reached allowing finish to occur outside of the tank. There are complete Pressure Casting systems available on the market—but at a premium price. But with a small investment, and, a little time, a system can be assembled for under $300 dollars.

Sources for Pressure Tanks (Ask for Paint Tank)---Industrial Paint Equipment Suppliers, Sears, Internet, E-bay.

The information and data contained herein are based on information we believe reliable. Each user of the material should thoroughly test any application and independently conclude satisfactory performance before commercializing. Suggestions of uses should not be taken as inducements to infringe on any particular patent.