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.

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.

Advantages that ONYX® offers over other resins;
  1 - ONYX® is less expensive vs. other black resins
  2 - Cured plastic is ultra-black and darker than other black resins
  3 - Cured ONYX® plastic can be polished and buffed to a high gloss shine
  4 - ONYX® offers higher heat resistance (to 200°F /94°C at room temperature) vs. other black resin
s
  5 - Unlike other black resins, ONYX®does not contain mercury
  6 - If you desire a black casting, adding color pigment is not necessary