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Methylene Diphenyl Diisocyanate (MDI): MDIs are created from the phosgenation on the condensation products of aniline with formaldehyde. The commonest isomer used in polyurethane production is purified 4,4 isomers. MDIs are normally Utilized in creating rigid and semi-rigid polyurethane foams.ที่ใช้ร่วมกับเครื่