IsoMold URP 5121 is used to make molds of detailed masters that do not contain undercuts. ISOMOLD URP 5121’s physical properties make it ideal for making concrete patterns and formliners. IsoMold URP 5121 is a two-part polyurethane molding system. IsoMold URP 5121 is mixed one-to-one by volume (or one-to-one by weight) and cures at room temperature. IsoMold URP 5121 cures to a hard (Shore A50); gray rubber.
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Technical Data SheetProduct Types
Elastomer
Product Testing
| Test Performed | Test Results |
| Color - ISO | amber |
| Color - POL | gray |
| Demold Time | 24 Hours |
| Elongation - ASTM D412 | 350 % |
| Gel Time | 15 Minutes |
| Hardness - ASTM D2240 - Shore A | 50 Shore A |
| Mix Time - by Hand | 1-2 Minutes |
| Open Time - ISO | 4.3 |
| Pot Life - 100g | 12 Minutes |
| Rebound, Bayshore % - ASTM D2632 | 57 % |
| Split Tear - ASTM D470 | 15-25 pli |
| Tear Strength - ASTM D624, Die C | 130-170 pli |
| Tensile Strength - ASTM D412 | 1000 psi |