Choose release agents tailored to specific working conditions, including metal material, mold temperature, casting geometry, and post-casting cleaning requirements. For high-temperature molds (e.g., pre-spray mold temp ≥380℃ with poor cooling), opt for high-temperature-resistant agents (350-380℃ tolerance) to ensure durable film formation, reduce thermal shock on molds, and enhance demolding. For applications demanding rigorous cleaning, select silicone-free release agents.
Initial Calibration: Start with supplier-recommended dilution ratios. Under non-sticking conditions, push to the maximum feasible dilution limit. Monitor workpiece appearance, mechanical properties, and carbon buildup time to identify the optimal concentration that balances efficiency and performance.
Regular Checks: Use a refractometer or calibrated dilution tank to verify concentration periodically.
Key tests include density, pH, solid content, composition, and thermal stability.
Solid Content: Critical for performance. Use a refractometer (dilute 1:1 if solid content >25% for accuracy) or an oven (105℃ for 3 hours) for precise measurement.
Composition/Thermal Stability: Confirm parameters with suppliers and conduct periodic spot checks per contractual agreements.
pH Value: Monitor for acidity changes. Opened or sun-exposed agents may acidify, promoting bacterial growth, nozzle clogging, and instability.
Troubleshooting: If sticking occurs, first check mold temperature and spraying parameters (angle, position, distance). Consistent conditions typically yield stable results unless the agent’s composition changes.
Water Quality: Prefer deionized water (low in calcium/magnesium ions) to avoid pipe blockages and scaling. If using tap water, regular pipe cleaning is mandatory due to mineral ions, microbes, and bacteria. Well/spring water is strongly discouraged due to high metal ion content destabilizing production.
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