Custom heat sinks and thermal management solutions for electronics, manufactured in Ennepetal
Seifert electronic GmbH
EnnepetalNew on Amplifa
About Seifert electronic
Seifert electronic GmbH from Ennepetal has been manufacturing custom heat sinks for the safe dissipation of heat from electronic components for over 50 years. The product portfolio includes standard and profile heat sinks, high-performance heat sinks, skived heat sinks (Flexfin), bonded-fin heat sinks for forced cooling, pressure-tested liquid-cooled heat sinks, PC board elements, as well as thermal conductive and insulating products. Manufacturing covers extruded profiles in nearly all desired dimensions, CNC machining, cutting to length, deburring, side punching, skiving, joining including friction stir welding (FSW), surface treatments such as (partial) anodizing, as well as assembly and testing. In addition to its catalog program, the company develops customer-specific special profiles with exclusive usage rights and advises on the design of thermally optimized heat sinks. Customer industries include wind power, rail technology, laser technology, LED lighting, board-level electronics, solar applications and inverters. As a member of the Heat Sink Group, the company is also present at trade fairs such as the Evertiq Expo.
- Site
- Ennepetal
- Processes
- Skiving (Flexfin skived heat sinks), Extruded profiles (cooling profiles), Cutting to length, CNC machining, Milling of cooling channels (liquid-cooled heat sinks), Side punching / punching of profiles, Stamped and bent parts, Deburring
- Materials
- Aluminium, Thermoplastic, Beryllium copper, Brass, Aluminium EN AW-6060, Aluminium EN AW-6063, Thermoplastic PBTP 841 FR, Thermoplastic PCT CG 923
- Certificates
- In-house testing and data sheets
- Industries
- Wind power, Rail technology, Laser technology, LED, Circuit boards/Electronics, Solar applications
- 01
Consulting and design of cooling profiles
- 02
Extruded profiles and skiving
- 03
Cutting to length and CNC machining
- 04
Joining (including friction stir welding)
- 05
Surface treatment (anodizing)
- 06
Testing and marking
- 07
Assembly and shipping
Materials and Processes
Aluminium EN AW-6060
Extrusion alloy for cooling profiles, thermally aged for optimal thermal conductivity.
Aluminium EN AW-6063
Extrusion alloy for cooling profiles, thermally aged for optimal thermal conductivity.
Thermoplastic PBTP 841 FR
Self-extinguishing thermoplastic for sockets and insulating bodies in accordance with UL 94 V-0.
Thermoplastic PCT CG 923
Heat-resistant thermoplastic for mounting washers and diode holders up to 290 °C.
Beryllium copper
Precision collet contacts in IC sockets with gold-plated surface.
Brass CuZn37
Contact pins in sockets, surface finished by tinning or gold plating.
Skiving
Flexfin skiving process for heat sinks with flexible fins made from a single piece of aluminium.
Friction stir welding (FSW)
Joining process for large heat sinks made from existing extruded profiles.
Anodizing
Surface treatment of heat sinks, also partial anodizing using masking.
Site
Ennepetal
DEHeadquarters and manufacturing
- Materials
- Aluminium (EN AW-6060/6063), thermoplastics, beryllium copper, brass
- CNC machining
- Cutting to length
- Deburring
- Skiving (Flexfin)
- Friction stir welding (FSW)
- Surface treatment/anodizing
- Assembly
- Testing
Components
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Skiving (Flexfin skived heat sinks)Forming | – | – | – | – | Aluminium |
| Extruded profiles (cooling profiles)Forming | – | – | – | – | Aluminium |
| Cutting to lengthMachining | – | – | – | – | Aluminium |
| CNC machiningMachining | – | – | – | – | Aluminium |
| Milling of cooling channels (liquid-cooled heat sinks)Machining | – | – | – | – | Aluminium |
| Side punching / punching of profilesForming | – | – | – | – | Aluminium |
| Stamped and bent partsForming | – | – | – | – | Aluminium |
| DeburringSurface | – | – | – | – | Aluminium |
| DegreasingSurface | – | – | – | – | Aluminium |
| Surface treatments / anodizing (also partial anodizing with masking)Surface | – | – | – | – | Aluminium |
| JoiningJoining | – | – | – | – | Aluminium |
| Friction stir welding (FSW) of cooling profilesJoining | – | – | – | – | Aluminium |
| AssemblyAssembly | – | – | – | – | – |
| Special testingTesting | – | – | – | – | – |
| MarkingSurface | – | – | – | – | – |
| Heat treatment (hardening/thermal ageing) of aluminium alloysHeat treatment | – | – | – | – | Aluminium |
| Thermal ageing of heat sink alloys EN AW-6060 and 6063Heat treatment | – | – | – | – | EN AW-6060, EN AW-6063 |
| Design of cooling profiles (development of custom heat sink solutions)Engineering | – | – | – | – | Aluminium |
Additional services
Quality
The company performs special tests on its heat sinks and documents thermal values such as thermal resistance and pressure drop in product data sheets.
| Evidence | Ennepetal |
|---|---|
| In-house testing and data sheets |
History
Founding – the company has been cooling electronics for over 50 years
- 2026
Premiere at the Evertiq Expo in Lund (Sweden) with high-performance cooling and the new WieLeco solution