Smooth-Cast® ONYX™ is a mercury-free urethane resin that cures quickly at room temperature to adeep black, solid plastic. ONYX™ offers the convenience of a 1A:1B by volume mix ratio and has avery 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 resins
5 - Unlike other black resins, ONYX™ does not contain mercury
6 - If you desire a black casting, adding color pigment is not necessary