 Inexpensive Methods for Expediting Cure
* Use solar heat. Build a tent of black plastic to keep the mold/casting out of direct sunlight.
*Build a box and use a 40-100W bulb to generate heat. Bulb wattage depends on the size of the box and temperature desired.
* Add convection to the above box by cutting a hole in the side and using a small desk fan.
* Wrap the mold in an electric blanket. |
Aromatic vs. Aliphatic Urethanes
Aromatics are one of the more common chemistries in the world of casting urethanes. They tend to be more economical to produce, have good physical properties, and range from low durometer elastomers to rigid plastics. Their downsides tend to be poor UV resistance, color stability, and lower chemical resistance. The Aliphatic urethanes have outstanding UV stability, color stability, and chemical resistance. Their down side tends to be longer gel and demold times, low heat distortion, low tolerance to colder casting temperatures, and higher material costs. Blends of Aliphatic and Aromatic urethanes can exhibit excellent UV resistance, good heat distortion, and good physical properties such as our TC-857, TC-878/879, and our 600 series of elastomers.
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