Urethane Resin Casting for Awesome Molds

Use either ComposiMold or ImPressive Putty for Urethane castings.

Many people use urethane resins because of their versatility and relatively simple use. Most urethane casting materials are 1:1 mixes with short casting times ranging from 1 to 30 minutes. Urethane plastics are used for making models, prototypes, crafts, and art pieces. 

Polyurethane resin casting in ComposiMold

Urethane resin in ImPRESSive Putty

Quick tip for success with urethane casting resins and ComposiMold:

With ImPRESSive Putty, faster cure urethane casting resins work really well. The mold making putty can handle the higher temperatures of the fast cure urethanes. 

For ComposiMold, choose a urethane with a longer cure time. These create less heat as they cure. You can also experiment with freezing the mold prior to pouring higher temperature urethane resins. Be sure to use talc powder/baby powder as your mold release before each casting made.

ComposiMold works very well with many urethane resins. However, there are two potential issues with some urethanes:

• Some fast cure urethanes create a lot of heat when they cure, which can melt the ComposiMold. You can work around this by chilling your mold first, adding fillers into the urethane before casting, or pouring the resin in intervals.
• Some urethanes are very sensitive to moisture. Use talcum powder as a mold release to reduce any moisture from the mold from reacting with the urethane.
• Use a mold release that is designed for polyurethane casting.

ComposiMold has two urethane resins available that we believe work very well with ComposiMold:

• Protocast Urethane Casting Resin: off white, easy mix, easy pouring, rigid urethane,
• Purecast Urethane Casting Resin: 100: A to 13: B Color Semi-transparent, Reddish/Brown Shore Hardness –50D-60D Gel Time about 10 minutes

Urethane resins require dry fillers. Any water will create bubbles and heat. If you using powdered fillers in the polyurethane, dry the material in the oven at low temperatures for 15 to 30 minutes prior to mixing. 

Pouring ComposiMold mold for resin casting

Making wheels from Urethane resin in ComposiMold mold

Visit Polyurethane Casting with ComposiMold for videos.

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Polyurethane Resin Casting Material

We are always offering new products on our website including this polyurethane resin casting material called ProtoCast. I used it this morning and had great results. The color is a bright white and the surface of my cast is very smooth.

I mixed Component A and Component B by volume which means you can mix it 1:1. You can also mix it by weight which is 100 parts Component A to 86 parts Component B. Easy! I waited 20 minutes and it had cured perfectly at room temperature.

Note: If you are making a large cast, I would recommend cooling the mold in the freezer (or wrapping a larger mold in ice packs) once you pour the ProtoCast. This will slow down the curing process which produces heat that could compromise the integrity of your mold. 

Keep checking back to our website to see what kind of new products we've added. And never hesitate to let us know what else you might need for your molding and casting projects.

Happy Mold Making ~Michelle

For More Information visit: www.ComposiMold.com www.Facebook.com/ComposiMold www.YouTube.com/ComposiMold order at www.ComposiTherm.com