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Smooth-Cast ONYX Series

Smooth-Cast™ ONYX™ is a mercury-free urethane resin that cures quickly at room temperature to a deep black, solid plastic. ONYX™ offers a higher heat resistance, up to 250°F/121°C, and the cured plastic can be polished. Applications include reproducing sculpture, making prototypes and potting / encapsulation. Due to it’s quick cure time and hardness, ONYX™ FAST is a good choice for creating fast cold cast bronze, brass, copper, nickel/silver, etc. effects.

  1. Watch Video
    Smooth-Cast™ ONYX™ SLOW
    Smooth-Cast™ ONYX™ SLOW
    Medium-setting BLACK low viscosity liquid plastic. 1A:1B by volume mix ratio. 5 min pot-life and 90 min cure time.
    Trial Size
    $30.71
    1 Gallon Unit
    $134.71
    🞩
  2. Watch Video
    Smooth-Cast™ ONYX™ FAST
    Smooth-Cast™ ONYX™ FAST
    Fast-setting BLACK low viscosity liquid plastic. 1A:1B by volume mix ratio. 2.5 min pot-life and 15 min cure time.
    WARNING: Prop 65
    Trial Size
    $28.42
    1 Gallon Unit
    $135.88
    🞩

Quick Tech Specs

Smooth-Cast™ ONYX™ SLOW

  • Mix Ratio By Volume 100A:100B
  • Mix Ratio By Weight 120A:100B
  • Pot Life 5 minutes
  • Cure Time 90 minutes
  • Shore Hardness 80 D
  • Color Black

Smooth-Cast™ ONYX™ FAST

  • Mix Ratio By Volume 100A:100B
  • Mix Ratio By Weight 120A:100B
  • Pot Life 2.5 minutes
  • Cure Time 15 minutes
  • Shore Hardness 80 D
  • Color Black

Videos

How-to videos can educate and improve your mold making skills.

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