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Key Differences
| Color | White | Clear Amber |
| Elongation @ Break | 5 % | 10 % |
| Compressive Modulus | 45,800 psi | 36,500 psi |
| Flexural Modulus | 128,000 psi | 101,000 psi |
Disclaimer
Although we do our best to ensure the accuracy of this Compare Tool, Smooth-On offers no warranty either expressed or implied as to the reliability of the information contained herein. Smooth-On assumes no liability for loss or damage associated with use of the Compare Tool. If this is a critical project, we encourage you to review all of the technical data below and contact our Technical Service department with any questions or concerns.All Technical Data
| Smooth-Cast® 300 | Smooth-Cast™ 325 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 80 cps | 100 cps |
| Mix Ratio By Volume | 1A:1B | 1A:1B |
| Mix Ratio By Weight | 100A:90B | 115A:100B |
| Pot Life | 3 minutes | 2.5 minutes |
| Cure Time | 10 minutes | 10 minutes |
| Shore D Hardness | 70 | 72 |
| Specific Gravity | 1.05 g/cc | 1.07 g/cc |
| Specific Volume | 26.4 cu. in./lb. | 25.9 cu. in./lb. |
| Color | White | Clear Amber |
| Tensile Strength | 3,000 psi | 3,170 psi |
| Tensile Modulus | 139,500 psi | 140,000 psi |
| Elongation @ Break | 5 % | 10 % |
| Compressive Strength | 4,000 psi | 3,500 psi |
| Compressive Modulus | 45,800 psi | 36,500 psi |
| Flexural Strength | 4,510 psi | 3,690 psi |
| Flexural Modulus | 128,000 psi | 101,000 psi |
| Shrinkage | 0.01 in. / in. | 0.01 in. / in. |
| Heat Deflection Temp | 120 °F | 120 °F |
Product Description
Smooth-Cast® 300
The Smooth-Cast® 300 Series of liquid plastics are ultra-low viscosity casting resins that yield castings that are bright white and virtually bubble free. Vacuum degassing is not necessary. They offer the convenience of a 1A:1B by volume or 100A:90B by weight mix ratio. The differences between them are pot life and demold time.
These resins readily accept fillers (such as URE-FIL® 3 ) and can be colored with SO-Strong® or Ignite® color tints (Smooth-Cast® 325 series accepts pigments better than the Smooth Cast® 300 series). Fully cured castings are tough, durable, machinable and paintable. They resist moisture and mild solvents. Applications for Smooth-Cast® 300 Series Liquid Plastics include reproducing small to medium size sculptures, making prototype models, special effect props and decorative jewelry.
Those interested in making roto cast pieces should refer to the Smooth-Cast® 65D technical bulletin.
Smooth-Cast™ 325
The Smooth-Cast™ 325, 326 & 327 ColorMatch™ Series plastics are urethane resins that were developed specifically for adding color pigments and fillers to achieve true color representation or filler effect. The ColorMatch® Series is formulated “color neutral”. Small amounts of pigment will yield accurate, vivid colors from cured castings using So-Strong™ tints UVO™ pigments or Ignite™ color pigments. The ColorMatch™ Series offers the convenience of a 1A: 1B mix ratio by volume and has a very low viscosity. Demold times range from about 10 minutes to 2-4 hours (depending on product, mass and mold configuration). Note: Large mass castings will get very hot and shrink more, depending on mold configuration.
The ColorMatch™ Series also readily accept fillers (such as URE-FIL™ 3 from Smooth-On). Because of its neutral color, Smooth-Cast™ 325 is ideal for creating marble and wood grain casting effects, or duplicating the look of real metal by adding bronze, brass or other metal powder. Applications for the ColorMatch™ Series plastics include making pigmented prototype models or figures, special effect props, reproducing small to medium size sculptures, decorative jewelry, etc.