ADC12 and A380 are both widely used Al-Si-Cu alloy families in die casting, but they should not be treated as automatically interchangeable simply because their applications overlap.
For an actual sourcing project, the alloy designation is only one part of the decision. The drawing, applicable material specification, required properties, casting route, downstream operations and inspection requirements also need to be aligned.
This guide explains how to compare ADC12 and A380 from the requirements of the actual component rather than from universal process settings.
1. Separate the Alloy Designation from the Required Specification
ADC12 and A380 are alloy designations used under different specification systems. When either designation appears on a drawing or RFQ, do not approve substitution based on the name alone.
Confirm the applicable specification, chemistry requirements, required mechanical or functional properties and any customer approval requirements. In international sourcing, a supplier statement that two alloys are “equivalent” should be supported by the actual specification and material documentation required for the project.
2. Do Not End the Comparison with a Chemistry Table
Chemical composition is important, but final part quality is not determined by chemistry alone. Melt control, filling behavior, die thermal balance, venting, solidification and downstream processing also influence the result.
The practical comparison should therefore connect alloy characteristics with the part’s requirements for filling, strength, corrosion behavior, machining and finishing rather than selecting an alloy from one isolated property value.
3. Do Not Select the Casting Process from the Alloy Name Alone
HPDC, LPDC, gravity casting and other processes have different characteristics, but a single wall-thickness or annual-volume threshold is not sufficient to select the process.
Review component geometry, projected area, wall-thickness distribution, internal-quality requirements, leak or pressure requirements, mechanical-property needs, heat-treatment requirements, dimensional requirements, production volume and the available equipment and tooling concept.
For a broader process comparison, see How to Choose Between HPDC, LPDC and Gravity Die Casting.
4. Verify Filling Feasibility for Thin and Complex Geometry
For thin sections, long flow paths, ribs and complex geometry, alloy fluidity is only one factor. Gate and runner design, overflow and venting, die thermal balance and the injection profile also affect whether the cavity can be filled consistently.
Instead of relying on a statement such as “this alloy can cast down to a fixed wall thickness,” review the candidate supplier’s proposed tooling concept and process assumptions against the actual drawing.
5. Define Internal Quality and Leak Requirements Separately
If the component has leak, pressure, machined-surface or internal-quality requirements, the alloy designation alone does not define the acceptance condition.
Specify the relevant test conditions, inspection method, critical locations and acceptance requirements in the drawing or RFQ, then verify how the supplier intends to control and inspect them.
For root-cause review of porosity and leakage, see Aluminum Die Casting Porosity and Leakage.
6. Do Not Assign Casting Tolerance from the Process Name Alone
When reviewing casting tolerances, separate dimensions controlled in the as-cast condition from dimensions that will be finished by machining, and consider the drawing datum structure and inspection method.
ISO 8062-3:2023 covers general dimensional and geometrical tolerances and machining allowance grades for castings. It should not be interpreted as assigning one universal tolerance grade automatically to a particular casting process.
For critical dimensions, verify the candidate supplier’s experience with comparable parts, tooling concept, measurement method and process capability, and include machining where required.
7. Compare the Complete Manufacturing Route
When the purchased item is a finished component rather than an as-cast blank, the comparison must extend beyond casting.
Review machining datums and stock, threaded or sealing features, surface treatment, cosmetic requirements, cleaning, inspection and packaging. If casting, machining and finishing are managed through one China-side supply route, make the responsibility and outsourced-process boundaries visible.
8. What to Verify with a Chinese Supplier
- Applicable alloy specification and material documentation
- Proposed casting process and equipment concept for the drawing
- Production experience with comparable geometry and quality requirements
- Tooling feasibility, including filling, venting and thermal-control considerations
- Inspection approach for internal quality, leakage or pressure requirements
- Control method for critical dimensions and machining scope
- Complete manufacturing route including outsourced finishing processes
- Verification plan from tooling trial through mass production
To verify execution on the shop floor rather than relying only on an equipment list, see China Die Casting Factory Audit.
Conclusion
ADC12 versus A380 should not be decided from the alloy name or one property value alone.
Bring the drawing, applicable specification, required properties, casting route, internal-quality requirements, dimensions, machining, finishing and inspection conditions into one manufacturing requirement, then verify whether the candidate supplier can control that requirement in production.
When preparing a specific drawing for quotation and technical review in China, also organize the technical RFQ requirements for die-casting sourcing.
Frequently Asked Questions
Q1. Are ADC12 and A380 directly interchangeable?
Do not approve substitution from the designation alone. Confirm the applicable specification, chemistry requirements, required properties, downstream processing and customer approval conditions.
Q2. Which alloy is better for a thin-wall component?
The alloy is only one factor. Filling feasibility also depends on geometry, flow length, gating and venting, die thermal balance and equipment capability.
Q3. Can HPDC and LPDC be selected from wall thickness or production volume alone?
No single threshold is sufficient. Internal quality, leak or pressure requirements, mechanical properties, heat treatment, dimensions, geometry, volume, equipment and tooling all need to be considered.
Q4. Does ISO 8062-3 define one tolerance grade for HPDC?
ISO 8062-3:2023 addresses general dimensional and geometrical tolerances and machining allowance grades for castings. It should not be interpreted as automatically assigning one fixed grade to HPDC. Apply the drawing requirements and actual manufacturing conditions.