Production & Quality
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Surface blooming of PU
Problem Phenomenon
White frost-like low molecular substances precipitate on PU product surface, affecting appearance
Cause Analysis
Low molecular components in PU migrate to the surface and precipitate during storage; lubricant or plasticizer supersaturated and precipitated
Solution
1) Select high molecular weight PU to reduce low molecular substances; 2) Reduce lubricant addition to a reasonable level; 3) Clean the product surface and then test the source
Key Takeaway
Blooming is caused by low molecular migration and precipitation; selecting high molecular weight grade is fundamental
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