Smooth-Cast ONYX™ is a mercury-free urethane resin that cures quickly at room temperature to a deep black, solid plastic. ONYX™ offers the convenience of a 1A:1B by volume mix ratio and has a very low viscosity, so it is easy to mix and pour. ONYX™ has an ultimate shore hardness of 80D and offers higher physical properties and higher heat resistance vs. other general purpose resins.

Advantages that ONYX™ offers over other resins; 1) if you desire a black casting, adding color pigment is not necessary, 2) cured plastic is ultra-black and darker than competitive black resins, 3) cured ONYX™ plastic can be polished and buffed to a high gloss shine and 4) ONYX™offers higher heat resistance vs. competitive black resins, 5) unlike other black resins, ONYX™ does not contain mercury and 6) ONYX™ is less expensive vs. other black resins.

Applications include reproducing sculpture, making prototypes and potting / encapsulation. Because ONYX™ is a fast curing resin and becomes hard quickly, it is also great for doing fast cold cast bronze, brass, copper, nickel/silver, etc.