For bubble-free and air-trap-free resin castings the use of a pressure pot is required. This is especially critical in creating clear resin castings as trapped air can mar the appearance of a crystal clear casting. The Alumilite Pressure Pot is designed for use in applying pressure to force air out of resin and to force resin into thin sections of a mold. This eliminates air bubbles and air traps in the cured castings. This pressure pot includes a gauge and all the other fittings. However, you will also need to purchase an air compressor of at least 3.5 H.P. and a ¼-inch adapter/coupling to attach the air compressor to the pressure pot. Both items are readily available at the larger home supply centers such as Sears, Home Depot and Lowes.

 

Specifications:

Capacity: 2.5 gallons

Dimensions: 8 ¾-inch diameter by 11.5-inches tall

Maximum Pressure: 50 PSI

Weight: 10-pounds

Gasket Material: Polysulfide

 

Pressure Process:

Casting under pressure is the best way to make high quality resin castings. This is especially true with difficult recesses and complex molds. Pressure casting compress air to sizes undetected by the human, creating a virtually ?bubbleless? casting.

 

Simply cast your part in your mold and then insert your mold into the pressure pot. Secure the lid tightly, and then turn on your air supply to fill the pot to 30-40 PSI. (DO NOT EXCEED 50 PSI). Leave the pressure pot on until the casting has cured. Then remove the air source and release the air from the pot. Unfasten the lid and remove your mold from the pot. Demold your void free casting.

 

Note: You will want to make certain you pressure cast your silicone mold while curing or use your vacuum chamber to remove all air from the mold rubber to avoid having the mold collapse in areas of your mold that have air trapped under the surface. You will have the appearance of ?warts? on the surface of the finished result if you do not.

 

Summary:

Mix your resin in accordance with the directions and pour into your mold

Place the mold in the pressure pot

Place the lid on the pressure pot and locate the (4) locating slots on the cover lining them up with the (4) swing up bolts on the tank.

Place the (4) swing bolts into the slots in the cover and secure the (4) hand nuts tightly on the cover.

Make certain the nuts are secured tightly before pressurizing the tank