Bond Failures in the Polyurethane-Cement Interface

This failure mode is where a layer of primer is visible on the reinforcing but not on the polyurethane. The possible causes and solutions are given in Table 6.3. 

Precure of polyurethane Pour polyurethane when the viscosity is low Transfer molding—start transferring earlier 

Precure of bonding agent Speed up transfer cycle Lower molding temperature 

Leakage Check mold for any sign of leaks Ensure all split lines are well sealed 

Incorrect molding cycle Check mold temperature Check cure rate of polyurethane 

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