Core swelling due to excessive moisture uptake during coating application leads to which defect?

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Prepare for the Manor Preboards Module 5 Test with multiple choice questions and detailed explanations. Enhance your study with structured modules to master the test content efficiently.

Multiple Choice

Core swelling due to excessive moisture uptake during coating application leads to which defect?

Explanation:
Moisture-induced swelling in a coating creates internal stress that leads to cracking. When the coating absorbs water during application, it swells. If the film is still soft or the substrate resists this expansion, the swelling is constrained, so elastic energy builds up. As the coating dries and the moisture leaves, the film contracts, and the mismatch between swollen and shrunk states causes the film to crack in a network pattern. This specific cracking behavior from moisture uptake is characteristic of film cracking Type 2. In contrast, Type 1 cracking is tied more to cracks formed during early film formation from rapid solvent loss and shrinkage without the swelling phase. Delayed dissolution for IR products is not related to moisture-induced swelling, and a rough coating is typically a texture issue from leveling or flow problems rather than a swelling-induced crack.

Moisture-induced swelling in a coating creates internal stress that leads to cracking. When the coating absorbs water during application, it swells. If the film is still soft or the substrate resists this expansion, the swelling is constrained, so elastic energy builds up. As the coating dries and the moisture leaves, the film contracts, and the mismatch between swollen and shrunk states causes the film to crack in a network pattern. This specific cracking behavior from moisture uptake is characteristic of film cracking Type 2.

In contrast, Type 1 cracking is tied more to cracks formed during early film formation from rapid solvent loss and shrinkage without the swelling phase. Delayed dissolution for IR products is not related to moisture-induced swelling, and a rough coating is typically a texture issue from leveling or flow problems rather than a swelling-induced crack.

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