IsoMold URP 5121

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 Sheet
Product Types



Product Testing

Test PerformedTest Results
Color - ISOamber  
Color - POLgray  
Demold Time24 Hours 
Elongation - ASTM D412350 % 
Gel Time15 Minutes 
Hardness - ASTM D2240 - Shore A50 Shore A 
Mix Time - by Hand1-2 Minutes 
Open Time - ISO4.3  
Pot Life - 100g12 Minutes 
Rebound, Bayshore % - ASTM D263257 % 
Split Tear - ASTM D47015-25 pli 
Tear Strength - ASTM D624, Die C130-170 pli 
Tensile Strength - ASTM D4121000 psi