4se Tool 204 Hot Crack =link= Page

On , a hot crack is observed as a fine, linear fissure originating near the core/cavity interface or around thick-to-thin wall transitions . Unlike a cold crack (brittle fracture from mechanical stress), this hot crack appears within 1–3 seconds after cavity filling, while the part surface is still semi-molten. It typically propagates from a stress concentration point toward the ejection system or gate area.

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: Elements like Sulfur (S) and Phosphorus (P) form low-melting-point films at grain boundaries, weakening the material. On , a hot crack is observed as