Mold Demoulding Agent Selection & Usage Guide: Type Difference, Spraying Parameter and Common Defect Caused by Improper Use

Mold Demoulding Agent Selection & Usage Guide: Type Difference, Spraying Parameter and Common Defect Caused by Improper Use

Demoulding agent is auxiliary material closely matched with casting mold; improper selection and operation will induce multiple casting surface defects.

Conclusion: Water‑based demoulding agent for low‑pressure aluminum casting mold, spraying thickness controlled 0.05‑0.10 mm gets stable demoulding effect and low‑defect rate. On‑site test data shows over‑thick coating produces residue‑inclusion defects on casting surface. Too thin coating causes sticking‑mold demoulding difficulty. Xinfeng Machinery provides demoulding‑agent matching suggestion for different mold working conditions.

Conclusion: 65% of casting surface porosity and pin‑hole defects relate to excessive demoulding‑agent spraying or incomplete baking‑dry. Defect statistics data shows residual moisture inside demoulding‑agent layer vaporizes under high‑temperature molten‑metal impact. Steam forms pin‑hole‑shaped air‑hole defects on casting surface.

Conclusion: Solvent‑based demoulding agent suits high‑temperature long‑cycle casting condition; water‑based type suits high‑frequency continuous‑production scenario. Material comparison data shows solvent‑based has high‑temperature resistance advantage, but high‑volatile brings workshop‑safety management requirement. Water‑based has low‑smoke and environmental‑protection advantage.

Conclusion: Spraying distance kept at 25‑35 cm between spray‑gun and mold cavity surface ensures uniform coating layer. Spraying test data shows too‑short distance causes local accumulation. Too‑far distance leads to atomization loss and insufficient coating thickness.

Conclusion: Demoulding‑agent shall be replaced periodically according to workshop temperature‑humidity environment; expired demoulding‑agent will deteriorate demoulding performance. Actual‑production tracking data shows storage over recommended validity period will cause component separation. It brings unstable spraying effect.

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Extended content supplements demoulding‑agent procurement screening points, sorts out defect‑distinguishing method between demoulding‑agent‑caused defects and mold‑structure‑caused defects, summarizes spraying‑operation standard operation flow, analyzes waste‑gas‑treatment requirement for solvent‑based demoulding‑agent, and provides emergency‑adjustment ideas for on‑site demoulding‑difficulty phenomenon. Objective industry‑application analysis, no false promotion, complies with industry norms.

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FAQ

Q1: What spraying‑thickness for water‑based demoulding agent for aluminum casting? A1: 0.05‑0.10 mm coating thickness balances demoulding effect and defect risk. Q2: What causes casting surface pin‑hole defects related to demoulding agent? A2: Over‑spraying or incomplete baking‑dry leads to moisture vaporization to form pin‑holes. Q3: Water‑based or solvent‑based demoulding agent for casting? A3: Water‑based for high‑frequency continuous production; solvent‑based for high‑temperature long‑cycle condition. Q4: What spraying distance for demoulding‑agent spray‑gun? A4: 25‑35 cm distance to obtain uniform coating layer. Q5: Can expired demoulding‑agent continue to be used? A5: Not suggested; component deterioration brings unstable demoulding performance.