| http://www.w3.org/ns/prov#value | - The preferred isocyanate also includes prepolymers cured with esters such as adipate or caprolactone or prepolymers cured with polyether such as polypropylene glycol (PPG), polytetramethylene ethylene glycol (PTMEG), or other types of glycol (Du Pont, Wilmington, Del.).
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