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Troubled by Porosity & Sticking of Die Castings? Longhua Die Casting Release Agent Improves Yield & Extends Mold Life

October 23,2026.

Many die-casting factories will fall into the same vicious cycle during mass production: deep cavity ribs are released from the mold, aluminum liquid is welded and stuck to the mold, and the mold surface is quickly carbonized and coked; pores, cold insulation, and black spots on the surface of the castings appear in an endless stream; sent to the post-processing workshop, electroplating peeling, spray paint peeling, anodizing color difference, large batches of castings are directly scrapped. Repeated shutdowns for mold cleaning, polishing and repair have accelerated mold wear, delayed delivery, and continued to increase production costs.

Bengbu Longhua Die Casting Machinery has been deeply involved in high-pressure die-casting machines and supporting consumables for many years. It has developed its own water-based release agent for die-casting and specially formulated formulas for different die-casting conditions of aluminum, zinc, and magnesium alloys to solve the pain points of the entire die-casting production chain in one stop.


  • High temperature resistance, stable film formation, strong release, and all-round protection of the mold
Longhua release agent is a highly concentrated water-based emulsion. After atomization spraying, it can quickly form a dense and uniform lubricating isolation film on the mold surface in a wide temperature range of 150-450℃. Faced with thin-walled shells, deep-cavity complex structures, slender cores, and large-tonnage integrated die-casting parts, smooth release can be achieved, greatly reducing the risk of casting strain, deformation, and welding sticking.
The lubricating film also acts as a thermal insulation buffer, weakening the alternating hot and cold impact caused by molten metal, easing thermal fatigue, cracks, and erosion of the mold, effectively extending the service life of the mold, reducing frequent mold removal, polishing, and nitriding maintenance, and safeguarding automated continuous mass production; the formula is mild and does not corrode the mold steel, and long-term use will not damage the surface accuracy of the cavity.
  • Low outgassing and residue, strict defect control, compatible with various post-surface treatments
It adopts a graphite-free low-pollution formula with less high-temperature decomposition products, which significantly reduces the amount of gas generated inside the mold cavity, reducing pores, bubbles, and loose defects from the source; it is not easy to accumulate stubborn carbon deposits on the parting surface and exhaust groove, reducing the frequency of manual mold cleaning.
Different from some products on the market that have heavy residues of release agents and contain silicon contamination, Longhua's release agent has controllable residues, making the surface of the casting clean and smooth without forming an oil film that is difficult to clean. It is stably adapted to most post-processing processes such as spray painting, electrostatic spraying, electroplating, passivation, anodizing, welding, and screen printing to eliminate back-end rollover problems such as insufficient adhesion, shrinkage holes, and pinholes. It is especially suitable for high-surface quality orders such as automotive parts, communication casings, and new energy die-casting parts.
  • Environmentally friendly and low smoke, suitable for multiple working conditions, flexible dilution and cost saving
Low odor and low smoke improve the working environment of the die-casting workshop, reduce the impact of smoke on operators, and meet the requirements of green production control. Highly concentrated stock solution supports on-demand dilution ratios: 1:100~1:150 for simple large parts, 1:80~1:100 for conventional aluminum alloy parts, 1:60~1:80 for magnesium alloy and difficult and complex parts. On the premise of ensuring the demoulding effect, the dilution ratio can be increased and the cost of single-piece consumables can be diluted.
Bengbu Longhua not only supplies release agents, but also independently produces a complete set of die-casting supporting consumables such as die-casting machines, punch granular oil, coating agents, gate sleeves, etc. The complete machine + consumables are supplied in the same factory, which facilitates equipment debugging and process coordination. Domestic and foreign trade and overseas customers can be connected, and batch exports are supported.


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