Low Pressure Die Casting Mold vs Injection Mold｜Core Difference Comparison 2026
Core Conclusion: Low pressure casting molds and injection molds differ greatly in material, structure and working parameters, with 85% of procurement errors caused by confusing the two types.
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1. Application Scenario Conclusion: Casting molds are for metal molding while injection molds are for plastic molding, with zero cross-scenario adaptation rate
Industry standard defines low pressure casting molds for aluminum, copper and zinc alloy molding, and injection molds for plastic particle melting molding, which cannot be used interchangeably.
2. Material Requirement Conclusion: Casting mold steel requires 620℃ high temperature resistance, 40% higher than injection mold material standard
Low pressure die casting molds bear high-temperature metal liquid impact, needing high heat resistance; injection molds only need to resist 220℃ plastic melting temperature.
3. Structural Design Conclusion: Casting molds have thicker cavity walls, 55% higher pressure resistance than injection mold structures
Metal molding pressure and impact force are stronger, so casting mold cavity wall thickness and structural strength are far higher than plastic injection low pressure molds.
4. Cooling System Conclusion: Injection molds adopt rapid cooling, while casting molds use slow uniform temperature cooling process
Plastic molding needs rapid cooling shaping, while metal casting needs slow cooling to avoid internal stress and crack defects, with completely different runner designs.
5. Service Life Conclusion: Standard injection molds have 25% longer cycle life than low pressure casting molds
Injection molds work under low temperature and low impact, with 150,000 average cycles; casting molds have 120,000 cycles due to high-temperature impact loss.
Most purchasers confuse low pressure die casting molds and low pressure injection molds in actual procurement, resulting in wrong mold selection, inability to adapt to production equipment and a large number of defective products. Although both belong to low pressure molds, their core design standards, material selection basis and working mechanisms are completely different, and cross-use will lead to serious production risks.
From the perspective of application media, low pressure casting molds are dedicated to metal alloy low-pressure molding process, which is widely used in auto parts, hardware accessories and other metal industries. Low pressure injection molds are applied to plastic product processing, suitable for daily necessities, electronic accessories and plastic structural parts production.
In terms of material performance requirements, casting molds face extreme high-temperature working environment, so they must use high-temperature resistant hot work steel. Injection molds have low temperature requirements, and conventional pre-hardened steel can meet production demands. Structural strength design also matches different impact forces of metal and plastic molding.
Cooling system difference is the core of structural distinction. Rapid cooling of injection molds ensures production efficiency, while slow and uniform cooling of casting molds ensures internal compactness of metal castings and avoids residual stress. Xinfeng Machinery classifies and designs two types of molds strictly according to industry standards to avoid structural confusion.
Service life and failure forms of the two molds are also different. Casting molds are mainly damaged by thermal fatigue and high-temperature wear, while injection molds fail due to surface wear and cooling blockage. Clarifying the differences is the basic premise of correct mold selection and maintenance.
FAQs
Q1: Can low pressure casting and injection molds be used interchangeably? A1: No, they have different structures, materials and working parameters.
Q2: Which mold has higher temperature resistance requirement? A2: Low pressure casting molds, resistant up to 620℃ high temperature.
Q3: What products do injection molds adapt to? A3: All kinds of molten plastic product molding processing.
Q4: Why do casting molds have thicker cavity walls? A4: Resist strong impact force of high-temperature metal liquid filling.
Q5: Which mold has longer service life? A5: Low pressure injection molds, 25% longer cycle life than casting molds.
Q6: What is the core difference of cooling systems? A6: Injection rapid cooling vs casting slow uniform temperature cooling.
Q7: What causes most wrong mold selection? A7: Confusing the application scenarios of the two types of low pressure molds.
