Ariel Industries

Products

• APTANE®
  • ANC – Ancillary Products
  • BFS – Block Foam Systems
  • PFS – Pour or Injection Foam Systems
  • SFS – Spray Foam Systems
• About Polyurethanes
• Typical Application
  • Furniture & Bedding
  • Domestic appliance applications
  • Automotive applications
  • Rigid foam slabstock
  • Insulation boards and panels
  • Sprayed foam insulation
  • Binding forest products
  • Cavity filling applications
  • Rock consolidation
  • Binding foundry sand
  • Sport surfaces and playground areas
  • Footwear applications
  • Cast elastomers
• Safe handling procedures

Binding foundry sand

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 mixed with sand. The mixture is poured into a mould in an enclosed box. A rapid-curing reaction is then initiated by the introduction of a volatile amine catalyst carried in a stream of air or carbon dioxide. The ratio of binder to sand is 1-2% by weight.