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Crystal Clear™ 221

Crystal Clear™ 221 Technical Specifications

Clear Urethane Casting Resin

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All Technical Data

Crystal Clear™ 221
Product Type
  • Urethane Resins
Mixed Viscosity675 cps
Mix Ratio By Weight100A:75B
Pot Life75 minutes
Cure Time

Overnight Followed By Post Cures

Shore D Hardness85
Specific Gravity1.07 g/cc
Specific Volume25.9 cu. in./lb.
ColorClear
Tensile Modulus286,000 psi
Ultimate Tensile8,190 psi
Elongation @ Break12 %
Compressive Strength10,100 psi
Compressive Modulus87,000 psi
Flexural Strength11,400 psi
Flexural Modulus305,000 psi
Shrinkage0.0173 in. / in.
Heat Deflection Temp176 °F
Index of Refraction at 20°C1.50084
Index of Refraction at 25°C1.50035

Product Description

Crystal Clear™ 221

Crystal Clear™ 221 is a water white clear resin made specifically for applications that require absolute clarity. This is a “heat cure” system and a harder version of our popular Crystal Clear™ Series resins (Shore 85D).

CAUTION: NOT FOR HOME USE. THIS PRODUCT IS FOR INDUSTRIAL USE ONLY. With adequate local exhaust ventilation, respiratory protection is not normally required when using this product. Where risk assessment shows air-purifying respirators are appropriate, follow OSHA respirator regulations and European Standards EN 141, 143 and 371. Protective clothing (gloves and long sleeves) is required to minimize the risk of dermal sensitization. If breathing is affected or a dermal rash develops, immediately cease using this product and seek medical attention. Read SDS before using.

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