HELPFUL HINTS
FOR WORKING WITH IASCO
E-Z-CAST AND MASS CAST RESINS

Optical clarity in a clear casting may be influenced by 1) surface texture, 2) air entrapment, or 3) embedment contamination. To achieve the maximum clarity possible, your mold surface must be smooth. Textured or rough surfaces may "frost" the surface and diminish clarity.
Plate glass makes an excellent molding surface. Technique is the best way to reduce air entrapment. Pour the resin out of the can, and allow it to sit for about an hour, to liberate any trapped air. Then, add the proper amount of catalyst (12 drops catalyst per ounce of resin at 1/4" thick {E-Z-Cast}, or 4 drops catalyst per ounce at 4" thick {Mass Cast}), and stir GENTLY, minimizing any agitation that will reintroduce air into the mix.
Pour gently into mold. For superior management of air bubbles, a pressurized chamber is used. An increase of 25-50 psi will create an environment that cannot support a bubble in the resin. Pressure must be maintained throughout the cure cycle. The book: "How to embed animals and other scientific specimens in clear plastic", By Cleo Hardin, is an excellent source for discovering the process and preparation necessary to remove moisture before imbedding.
Parting advice:Always use release agent, run a test sample, work with fresh material only, avoid contact with catalyst.