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Dense EMA surface pits

Problem Phenomenon

0.1-0.3mm dense pits on EMA product surface affect appearance and coating adhesion

Cause Analysis

Raw material contains impurity particles >0.05%; mold cavity surface damage or corrosion pits

Solution

1) Replace with pure raw material with impurities <0.01%; 2) Repair and polish mold cavity to Ra<0.2μm; 3) Filter raw material to remove particles

Key Takeaway

Pits are caused by raw material impurities and mold damage; pure raw material and mold maintenance are key

EMA surface pits impurity particles mold repair raw material purity

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