Isocyanate-cured foundry resins Foundry resins are the binders used with foundry sand to make moulds and mould cores. MDI is used in the ‘cold process, which produces accurate sand castings without heating, saving energy, time & capital compared to the urea-formaldehyde & phenol-formaldehyde resins. In the ‘cold process’, a phenolic resin and Polymeric MDI are … Continue reading Binding foundry sand