Common High-Thermal-Conductivity Die-Cast Aluminum Alloy Grades
There is no single list of high-thermal die-casting grades that is equivalent across every national standard and supplier. Practical shortlists combine purpose-designed supplier alloys, low-copper Al-Si die-casting grades and Al-Si-Mg systems balancing structure and heat management. The grade name starts screening; chemistry, condition, supplier evidence and casting validation finish it.
How to Read a High-Thermal Grade
Supplier alloys developed for HPDC thermal/electrical performance include RHEINFELDEN ALLOYS Castasil-21 (AlSi9Sr). Use the supplier’s current controlled data.
ADC1, A413.0 and EN AC-44300/AlSi12(Fe) can enter shortlists in different standards, but their chemistry and requirements are not identical.
AlSi10Mg or AlSi10MnMg families may suit projects combining strength, ductility, corrosion and heat management, but the family name alone does not prove high conductivity.
ADC12, A380, AlSi9Cu3 and YL113 are useful mature-process/cost baselines and should not be advertised as high-thermal grades without data.
Common Grades and Candidate Families
Similar Al-Si names across standards can have different limits, impurities, mechanical requirements and test conditions.
Grade data, authorization, origin and long-term availability require project confirmation.
Standard, attached and production samples differ with porosity, wall, heat treatment and location.
Changes made for strength, machining or cost can alter thermal, corrosion and casting behavior.
Without chemistry, condition, supplier and validation requirements, lot variation can become unacceptable.
Coating, anodizing, adhesive, TIM and contact flatness may dominate system heat transfer.
Why Similar Grades Are Not Interchangeable
Create a benchmark
Record cost, castability, defects and component temperature using ADC12, A380 or the current production alloy.
Create a purpose-designed group
Select controlled thermal data and casting support, such as Castasil-21.
Create regional candidates
Evaluate ADC1, A413.0 and EN AC-44300 low-copper Al-Si routes according to target market.
Add structural candidates
Where strength or joining matters, assess defined AlSi10Mg/AlSi10MnMg grades and conditions.
Align comparison conditions
Use the same temperature, condition, method, wall and sampling logic.
Run casting trials
Validate filling, soldering, crack, porosity, vacuum, machining and finishing windows.
Run component thermal tests
Compare rise and cycling with actual heat source, TIM, fastening and cooling.
Freeze the specification
Lock standard, grade, supplier, chemistry, condition, certificates, inspection and change approval.
Grade Comparison and Application Matrix
| Control | Critical input | Operating requirement | Evidence |
|---|---|---|---|
| Castasil-21 / AlSi9Sr | Purpose-designed HPDC thermal/electrical alloy | Candidate for electronics cooling, lighting and air cooling; verify current supplier documentation | Supplier data and casting trial |
| ADC1 | Japanese-system low-copper Al-Si candidate | Regional shortlist entry; not directly equivalent to other AlSi12 grades | JIS requirement, certificate and component validation |
| A413.0 | North American Al-Si die-casting candidate | Review flow, leak, mechanical and thermal balance | ASTM/AA purchase specification and casting validation |
| EN AC-44300 / AlSi12(Fe) | European Al-Si die-casting candidate | Candidate screening under European material systems | EN specification, condition and supplier data |
| AlSi10Mg / AlSi10MnMg family | Structural-thermal balance candidates | Validate strength, ductility, corrosion, treatment and conductivity together | Exact standard grade and condition |
| ADC12 / A380 / AlSi9Cu3 / YL113 | Conventional die-casting benchmark | Cost and process-maturity baseline; not automatically high-thermal | Production evidence and like-for-like comparison |
Required Verification
| Verification | Check content | Trigger |
|---|---|---|
| Grade identity | Full standard, grade, chemical designation, supplier and condition | Selection and every change |
| Chemistry | Major elements, copper, iron, impurities and return-material rules | Incoming and heat |
| Conductivity | Temperature, direction, condition, method, sample location and uncertainty | Screening and periodic validation |
| Production casting | Porosity, cold shuts, oxides, dimensions, leak and machining exposure | Trial, PPAP and production |
| System thermal | Rise, hotspots, cycling and interface resistance in the real assembly | Design validation and after change |
Selection Errors and Diagnosis
| Abnormal condition | Controlled action |
|---|---|
| Same grade, different conductivity | Check standard revision, supplier, chemistry, condition, temperature, method and sample location first. |
| Purpose-designed alloy casts poorly | Rebuild gating/venting, vacuum, die-temperature, shot, release and charge controls instead of copying conventional-alloy parameters. |
| General Al-Si misses the target | Compare purpose-designed low-impurity thermal alloys and review component heat path/interface. |
| Material passes but system runs hot | Check porosity, wall, flatness, TIM, pressure, coating, heat sink and cooling boundary. |
| Supplier proposes substitution | Treat as a material change and revalidate chemistry, condition, castability, thermal performance, reliability and supply. |
RFQ and Material-Freeze Records
| Record level | Minimum content |
|---|---|
| Standard identity | Country/region standard, revision, grade and chemical designation |
| Supply identity | Producer, origin, trade name, lot certificate and availability |
| Material condition | As-cast/treatment, sampling, temperature and method |
| Process result | Melting, vacuum, shot, die temperature, defects, machining and finishing |
| Functional result | Conductivity, rise, hotspots, cycling, leak, mechanical and corrosion |
| Approval boundary | Approved grade/supplier combination, substitution, frequency and revalidation |
FAQ and References
Common entries include purpose-designed Castasil-21 and low-copper Al-Si candidates such as ADC1, A413.0 and EN AC-44300/AlSi12(Fe), subject to project validation.
No. They belong to different standards and require full chemistry, condition, performance, supplier and customer-approval comparison.
Castasil-37 is positioned mainly for structural castability and ductility. The supplier explicitly identifies Castasil-21 for optimized thermal/electrical conductivity.
Published values often use different temperatures, conditions, methods and samples. Ranking them without aligned conditions can mislead design and sourcing.
References and Application Boundary
- RHEINFELDEN ALLOYS: Castasil
- North American Die Casting Association
- ASM International
- XSD Precision: High-Thermal Alloy Selection
- XSD Precision: ADC12, A380, AlSi9Cu3 and YL113
To build a high-thermal alloy shortlist, submit operating temperature, allowable rise, drawings, target-market standard, mechanical/corrosion needs, current alloy, annual volume and validation conditions.
Submit High-Thermal Grade InputsResource Scope and Project Inputs
This module helps readers convert website guidance into reviewable RFQ and project inputs for XSD Precision engineering communication.
Who This Resource Is For
Sourcing, engineering, quality, program-management and supply-chain teams preparing an automotive precision engineering RFQ or production-readiness review.
Project Inputs
2D / 3D drawings, material grade, tolerance, surface finish, CTQ, tooling and gauges, inspection plan, sample validation, quantity and delivery requirements.
How XSD Precision Uses This Information
The website explains engineering methods, quality expectations and manufacturing-readiness paths. Drawings, specification revisions, inspection data and project confirmation materials are reviewed through direct project communication.