Voids (Internal Cavities) | Definition, Causes & Inspection Criteria

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Voids (Internal Cavities) | Definition, Causes & Inspection Criteria

Last updated on Jul 22, 2026

(1) What are Voids?

A void is an empty cavity formed inside a molded part.

Physical Appearance

Gate

Soft X-Ray Transmission Image (Comparison)

Voids / No Voids

Figure 1: Voids formed in thick-wall sections of handle specimen

Explanation for soft X-ray transmission image:

For conforming parts, white areas normally only appear at the shaft insertion area (near the gate).

For defective parts, extra white regions emerge in thick-wall sections, indicating internal voids.

📄 Definition

Internal cavities formed due to material shrinkage or trapped air.

🎯 Typical Locations

Thick wall sections, corners, part extremities, areas behind gates.

👁 Judgment Criteria

Focus inspection on thick wall areas; confirm by X-ray transmission or sectioning when necessary.

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Voids (Internal Cavities) | Definition, Causes & Inspection Criteria