RotoCastable Polyurethanes
Sealathane RotoCast's Resin was developed to facilitate the rotational molding of large and complex parts using a polyurethane resin. Due to the long pot life of the Sealathane RotoCast system, the mixed resin may be degassed to evacuate air from the system prior to pouring into the rotational mold, thus minimizing air entrapment in the final part. The mixed resin system is pourable at room temperature and will cure rapidly once it sees temperatures above 250oF. The Sealathane RotoCast Polyurethane systems are designed to rotationally mold parts of many different shapes and sizes. Sealathane has been utilized to rotomold large complex structures to provide more resiliency and cracking resistance than standard plastic. The large structures weighed as much as 230 pounds while the small structures weighted between 25 and 50 pounds. Sealathane has been used to manufacture large tanks measuring 10 feet by 8 feet by 2 feet. Sealathane provides complete coverage of the mold. No other polyurethane system commercially available has the ability to make such a large structure in this type of molding process.
Typical Properties
| Property | ASTM Test Method | R55 | R60 | R67 | R70 |
|---|---|---|---|---|---|
| Viscosity, cps | Brookfield | 2,800 | 3,000 | 2,900 | 3,300 |
| Pot Life, 25oC, hours | D1638 | 12 | 12 | 12 | 10 |
| Hardness | 2240 | 55D | 60D | 65D | 70D |
| Ultimate Tensile Strength, psi | D412 | 3,000 | 3,500 | 3,950 | 4,200 |
| Ultimate Elongation, % | D412 | 500 | 550 | 300 | 220 |
| Tear Strength, Die C, pli | D624 | 350 | 550 | 500 | 680 |