Application
Aluminum for Electronics & Heat Management
Heat sinks are an extrusion geometry problem: fin height, fin pitch and flatness tolerance. 6063-T5 holds fine fins that 6061 cannot.
Specification
What Electronics & Heat Management Specifies
| Grades normally used | 1050 · 6063 · 6061 |
|---|---|
| Product forms | Foil · Extrusion · Sheet |
| Standards & approvals | EN 755 · ASTM B221 · GB/T 5237.1 |
Grade by grade
What Each Grade Does in Electronics & Heat Management
An application page that lists five grades without saying what each one is for is a catalogue, not a specification. These are the roles they actually play here.
| Grade | The job it does here | Detail |
|---|---|---|
| 1050 | Heat-exchanger fin stock, where thermal conductivity matters more than strength. | Specs → |
| 6063 | Extruded heat sinks and enclosures — the extrusion alloy with a good thermal path and clean anodizing. | Specs → |
| 6061 | Machined housings, cold plates and structural brackets that need strength as well as conduction. | Specs → |
Before you send the enquiry
Specification Mistakes That Cost Money Here
None of these is exotic. All of them arrive on real enquiries, and each one adds a round trip before a price can be issued.
1. Comparing grades on conductivity alone. Thermal interface, fin geometry and bond resistance usually matter more than the difference between two alloys.
2. Specifying anodizing without the type. Type II is cosmetic and protective; Type III hard anodizing is a wear surface and changes the dimensional stack.
3. Forgetting flatness on machined plate. 6061-T651 is stress relieved by stretching; T6 thick plate is not, and it moves after machining.
4. Treating extrusion tolerance as universal. EN 755 and ASTM B221 tables differ, and a heat sink designed to one may not fit the other.
Categories that serve it
What We Supply Into Electronics & Heat Management
Verification
What We Put in Writing for This Application
- Mill test certificate to the class your file requires — 2.2 or 3.1 — carrying the actual mechanical test values for the heat.
- Gauge and surface inspection recorded before packing; photos of the sealed container.
- Where the market requires it, the classification society or coating test report with the issuing body named.
Before you ask
Electronics & Heat Management — Questions That Come Up
Which grade should a heat sink be?
6063 for extruded profiles, 1050 for fin stock, 6061 where the part is machined and carries structural load. Fin geometry and the manufacturing route usually decide before the alloy does.
Does anodizing affect the thermal path?
It adds a thin oxide layer at the surface. Type II films are thin enough that the effect is small; Type III hard anodizing is thicker and is chosen for wear resistance, not for conduction.
Why does machined plate move after machining?
Residual stress releasing as material is removed. Specify 6061-T651 rather than T6 for thick plate that will be heavily machined — the stretching step in T651 is what relieves the stress.