prov:value
| - The polyurethane block comprises a diisocyanate, typically 4,4'-diphenylmethane diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, paraphenylene diisocyanate or mixtures thereof, chain extended with a diol such as 1,4-butanediol, a dithiol such as 1,4-butanedithiol, a thio-substituted alcohol, such as 1-thiolbutane-4-ol, or mixtures thereof.
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