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Smooth-On Polyurethane Resins

Smooth-Cast® ONYX®


  • Ultra-black and darker than competitive black resins.
  • Cuan be polished and buffed to a high gloss shine.
  • Higher heat resistance vs. competitive black resins.
  • Does not contain mercury.
  • Less expensive vs. other black resins.

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Availability : This product is no longer in stock

Kit de 1 Kg
Kit de 7,48 Kg.
Kit de 37,5 Kg.

22,00 €

tax excl.

Smooth-Cast ONYX® is a mercury-free urethane resin that cures at room temperature to a deep black, solid plastic. ONYX® resins offer the convenience of a 1A:1B by volume mix ratio and have very low viscosities, so they are easy to mix and pour. ONYX®resins have an ultimate Shore hardness of 80D and offer higher physical properties and higher heat resistance vs. other general purpose resins.ONYX® FAST resin has a pot life of 2.5 minutes and a cure time of 10-15 minutes. ONYX® FAST is a good choice for creating fast cold cast bronze, brass, copper, nickel/silver, etc. effects.

Preparation - All liquid urethanes are moisture sensitive and will absorb atmospheric moisture. Water based clays are not recommended. Mixing tools and containers should be clean and made of metal or plastic. Materials should be stored and used in a warm environment (73°F/23°C). This material has a limited shelf life and should be used as soon as possible. Mixing should be done in a well-ventilated area. Wear safety glasses, long sleeves and rubber gloves to minimize contamination risk. Because no two applications are quite the same, a small test application to determine suitability for your project is recommended if performance of this material is in question.


Applying A Release Agent - A release agent is necessary to facilitate demolding when applying into or over most surfaces. Use Mann’s Ease Release 200 which will release both urethanes and silicones. A liberal coat of release agent should be applied onto all surfaces that will contact the plastic. IMPORTANT: To ensure thorough coverage, apply release and brush with a soft brush over all surfaces. Follow with a light mist coating and let the release agent dry for 30 minutes.

Curing - Warning: Fumes, which may be visible as this product starts to “gel” and cure, will dissipate with adequate ventilation. Only use this product with room size ventilation and do not inhale/breathe fumes. Castings will be hot to the touch immediately following cure and may burn the skin. Let cool to room temperature before handling. Demold time is directly proportional to mass and mold configuration. Larger castings will cure quicker than smaller or thin walled castings. Cure can be accelerated by adding SO-Cure® cure accelerator (from Smooth-On) or applying mild heat (150°F/65°C).

Post Curing - Although not necessary, post curing will increase physical properties, material performance and heat resistance to 250°F/121°C. After curing at room temperature for 1 hour, expose material in the mold to 250°F/121°C for 4–6 hours. Let cool to room temperature before use.

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