application Costron (formerly Bayer) Desmodur 44V20L Polymethylene polyisocyanate Crude MDI Black Polymeric MDI 9016-87-9 Product Description 44V20 is a mixture of isocyanate and diphenylmethane diisocyanate containing a c... 11/20108Costron (formerly Bayer) Desmodur 44V20L Polymethylene polyisocyanate Crude MDI Black Polymeric MDI 9016-87-9