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 higher NCO values)
• Heat the prepolymer and curative to the recommended temperature
• Ensure 1:4 Butanediol is dry by heating to 115°C and applying vacuum
• 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
• Part used containers should be flushed with dry nitrogen and resealed
  immediately after use
• Development of cure is long compared to TDI-MOCA systems.
• Rapid temperature change during the early stages of cure should be avoided.

Alternatives

• Solvents – ester based systems should be considered Neuthane 200 [TDI] or Neuthane 700 [MDI]
• Cost – Ester systems can be considered: Neuthane 700 [MDI Prepolymer] or Neuthane 802 [MDI Quasi]
• Temperature – Neuthane 100 [TDI PTMEG] or Neuthane 500 [Aliphatic Isocyanate]