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Reference.org
Hexamethylene diisocyanate
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<p>Hexamethylene diisocyanate (HDI) is the <a href="/facts/Organic_compound/gqCNaN45">organic compound</a> with the formula (CH2)6(NCO)2. It is classified as an di<a href="/facts/Isocyanate/YYDoDBgp">isocyanate</a>. It is a colorless liquid. It has sometimes been called HMDI but this not usually done to avoid confusion with <a href="/facts/Hydrogenated_MDI/61kbwkJk">Hydrogenated MDI</a>. </p>