Molding Process 5 views

High density of PU rigid foam

Problem Phenomenon

PU rigid foam density 0.35g/cm³, higher than 0.25g/cm³

Cause Analysis

Insufficient blowing agent dosage; isocyanate index too high; insufficient catalyst dosage, inadequate foaming

Solution

1) Increase physical blowing agent dosage by 10-15%; 2) Adjust isocyanate index to 1.05-1.1; 3) Increase catalyst dosage by 0.1-0.2wt%

Key Takeaway

PU rigid foam density is determined by blowing agent dosage and catalyst

PU rigid foam high density blowing agent isocyanate index catalyst

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