Plastic Part Cosmetic Defect – Pitting (Pockmarks) | Definition, Causes & Inspection Criteria | Justway

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Plastic Part Cosmetic Defect – Pitting (Pockmarks) | Definition, Causes & Inspection Criteria

Last updated on Jul 22, 2026

1. Definition

Pockmarks are small depressions formed on thick-section molded areas, caused when molten resin fails to fully adhere to the mold cavity surface.

2. Visual Characteristics

Tiny indentations on the part surface, generally small in size

Commonly found on thick wall sections

3. Main Causes

Pockmarks can stem from multiple factors; the primary contributor is insufficient pack pressure.

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Inspection Criteria

Observe the location and density of indentations

Focus inspection on thick wall regions

Distinguish pockmarks from contamination or impact marks

Document size, affected zones and quantity

Plastic Part Cosmetic Defect Training – Simple Reference for Quality Inspectors

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