Processing can be by hand or by dispensing machine

Hand Processing

• Melt prepolymer at 50-70°C for 12-24 hours (as a guide the grades with the lower NCO value will take longer to melt than those with very high level NCO values)
• Heat the prepolymer and curative to the recommended temperature
• Add pigments and Antifoam, as applicable, whilst mixing
• It is recommended that air be removed from the prepolymer under vacuum prior to addition of the curative
• Add the curative and thoroughly mix ensuring that no unmixed material is left on the container sides (if necessary the mix can be transferred to a second clean container and mixed again)
• Remove air under vacuum
• Cast into moulds, preheated to the recommended temperature
• Cure as recommended

Processing Considerations

• Avoid prolonged storage of prepolymers at elevated temperatures.
• This will result in low hardness and lower properties of the cured material
• Avoid moisture contamination of all materials
• Ensure thorough mixing of curatives prior to use
• Remove air, under vacuum, from the prepolymer components prior to use
• Part used containers should be flushed with dry nitrogen and resealed immediately after use

Alternatives

• Solvents – ester based systems should be considered Neuthane 200 [TDI] or Neuthane 700 [MDI]
• Cost – Aromatic Isocyanate / PTMEG based systems should be considered: Neuthane 100 [TDI] or Neuthane 600 [MDI]