Hello, I have Prepared a Polyurethane material from Polyol and Isocynate that are available commercially. I do not know which Polyol and which Isocynate it is. So I want to ask two questions: 1. How can we know about the type of Polyol and Isocynate? 2. How can I change the density of formed Polyurethane without changing the type of Polyol and Isocynate and without the addition of fillers?
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