The core advantages of investment casting (lost-wax casting) that distinguish it from other casting processes such as sand casting, shell molding, and die casting lie in high precision, complex forming capability, and excellent surface finish, along with good adaptability to high-difficulty materials. Its specific characteristics are clearly summarized as follows.
• It can directly replicate complex details such as fine holes (minimum φ1~2mm), deep cavities, interleaved curved surfaces, and tiny grooves through wax patterns. It can even achieve integral forming of internal flow channels and bionic structures without splitting or subsequent splicing.
• Traditional sand casting and shell molding are limited by parting surfaces and cavity filling, making it difficult to achieve high-density complex features and prone to incomplete forming.

• Dimensional tolerance can be controlled within ±0.1~0.3mm, geometric tolerance ≤0.02mm, and the dimensional consistency deviation of small and medium-sized parts in batch production does not exceed 0.05mm—far higher than sand casting (±1~3mm) and shell molding (±0.5~1mm).
• The split-free design completely eliminates flash and mold misalignment defects, reducing subsequent machining allowance by more than 70%. Some parts can be directly used for assembly.
• The surface roughness of castings is low (Ra1.6~6.3μm), smooth without sand holes or sand inclusion, equivalent to the finish milling level of mechanical processing, and no extensive grinding or polishing is required.
• Traditional processes have rough surfaces (sand casting: Ra12.5~25μm; shell molding: Ra6.3~12.5μm) and are prone to residual impurities, resulting in high subsequent processing costs.

• The ceramic shell has high temperature resistance (≤1600℃) and good air permeability, which can handle materials with high melting points (≥1450℃) and low fluidity such as stainless steel, superalloys, and titanium alloys, avoiding insufficient filling and air hole defects.
• The shells of sand casting and shell molding have weak high-temperature resistance and compatibility, which easily lead to a sharp increase in the defect rate of high-alloy castings.
• The wax pattern mold has low modification cost and short cycle, adapting to product iteration; the scrap rate during batch production is ≤3%, much lower than sand casting (8%~12%).
• The wax recovery rate is ≥90%, and the molten metal loss rate is only 10%~15%, with material utilization far higher than traditional processes.
In short, the core of investment casting lies in solving the pain points of traditional casting—"unable to make complex parts, unable to make precision parts accurately, and unable to make difficult-to-process materials well"—through "precision replication + high-quality shell", making it the preferred process for high-end precision parts.
If want to know about investment casting, click here https://www.balasen.com/products/low-temperature-wax-casting/
Pump Shell-Ductile IronFebruary 27, 2025This is a great ductile iron part named pump shell used for pump industry area.Balasen designed advanced pouring system to feed and float into the mold cavity.We have opened pouring system deployment,...view
How Do Foundries Choose the Right Casting Process for Different Metals?November 12, 2025Choosing the right casting process depends on a combination of material properties, cost considerations, and design complexity. Foundries make this decision based on the metal’s melting temperature, ...view
Quality of Cast Stainless SteelNovember 27, 2025Stainless steel casting is a highly regarded manufacturing process used to create intricate and durable components. This process is crucial in industries where strength, corrosion resistance, and the ...view
Manufacturing Process of Ductile IronNovember 27, 2025Ductile iron, known for its excellent strength and ductility, is a variant of graphite cast iron typically used in engineering applications requiring a high tensile strength. The process of manufactur...view
Precision Manufacturing for High-Strength ComponentsAugust 5, 2025In the world of industrial manufacturing, precision and durability are essential for critical components. Close die forging stands out as a premier manufacturing process for creating high-performance ...view
Manganese Steel Casting: Key Process Technologies by BalasenAugust 5, 2025In modern heavy industry applications where extreme wear resistance is paramount, manganese steel casting stands as the preferred manufacturing solution. As a specialized foundry with extensive experi...view