Smooth-Cast® ONYX™ Slow, Trial Size, 2.2lb

Item #: 88560
Our Price $29.95
Our Price $29.95

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 than 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:

  • ONYX™ is less expensive vs. other black resins.

  • Cured plastic is ultra-black and darker than other black resins.

  • Cured ONYX™ plastic can be polished and buffed to a high gloss shine.

  • ONYX™ offers higher heat resistance (to 200°F /94°C at room temperature) vs. other black resins.

  • Unlike other black resins, ONYX™ does not contain mercury If you desire a black casting, adding color pigment is not necessary​.

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