So, if it doesn't want to bend when you try to, it's probably a plastic. In real (read that "scientific") terms, this means that the hardness of the cured urethane is measured on the Shore "D" scale.
A D-60 hardness is sort of bendable.. easier described as "resilient", whereas a D-80 plastic is just plain hard. If you're trying to model a part that will eventually be injection-molded, you'll be able to locate the hardness of the ABS or styrene or whatever, then match it up to a castable urethane.
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