Smooth-On Crystal Clear Resin

Crystal Clear Series resins are water white clear and made specifically for applications that require absolute clarity. These rigid urethane casting resins differ only in working and demold times.Low viscosity ensures easy mixing and pouring. Crystal Clear products cure at room temperature with negligible shrinkage. Cured castings are UV Resistant and are not brittle. Vibrant colors and color effects are achieved by adding SO-Strong color tints. Applications include encapsulation, making prototype models, lenses, sculpture reproductions, decorative cast pieces, jewelry, prototype models, special effects and props. Heat curing is essential to realize full physical properties. Read the Technical Bulletin for full details.

  • Crystal Clear 202 - 90 min. cure time - for 1/16" thick castings
  • Crystal Clear 200 - 20 min pot life - 16 hr cure time - for 1/2" - 3" castings

Casting Thickness & Cure Time - The cure time and ultimate shrinkage of all Crystal Clear® products will vary depending on mass concentration, thickness of the casting, mold configuration, etc. For example, a 200 gram mass of CC 200 will cure faster if left to cure in a conical vessel (cup) versus a casting dispersed as a thin sheet measuring 3 centimeters square by 1 mm thick. This is due to the heat generated by the concentration of material in the cup versus heat that is dissipated from the sheet casting. Castings will resist yellowing when exposed to UV, but may darken over time.

Crystal Clear® 200 is intended for a casting thickness ranging from ½” to 3” at a casting weight maximum of 16 lbs. (7.25 kgs.) Castings greater than 3” should be layer cast.


Safety - Store and use at room temperature (73°F/23°C). These products have a limited shelf life and should be used as soon as possible. Environmental humidity should be as low as possible. Good room size ventilation is essential. Wear safety glasses, long sleeves and rubber gloves to minimize contamination risk. Wearing a NIOSH approved respirator will minimize inhalation of residual fumes.

Selecting A Mold Rubber - Pour into a urethane rubber mold (Vytaflex urethane – release agent required), tin cured silicone mold (Mold Max® silicone) or Mold Star® 15, 16 or 30 (not Mold Star® 20T) platinum cured silicone. Do not use other rubber mold products.

If using Mold Max silicone; to prevent cure inhibition, post-cure newly cured silicone mold for 8 hours at 60° C / 150° F and let cool prior to casting resin. If you are unsure about surface compatibility, a small scale trial casting should be made.

For Best Results Before Pouring Crystal Clear® Into Mold: Pre-heat rubber mold at 212°F / 100°C for 4 hours. This will minimize chances of fish-eyeing, suck back, corner rounding, large bubbles, etc. in finished casting.

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