In modern electronics manufacturing—from high-wattage LED streetlights and solar string inverters to Variable Frequency Drives (VFD) and industrial power supplies—heat is the number one cause of component failure. As power densities rise, semiconductor chips, diodes, and transistors generate intense heat that must be carried away continuously to prevent electronic burnout.
The global industrial solution for passive cooling is the extruded aluminium heat sink profile. Extruded with complex high-surface-area vertical fins on massive extrusion presses by Jindal Aluminium, these profiles absorb heat directly from electronic baseplates and disperse it into passing air currents without requiring noisy motorized fans.
In this industrial guide, Imperial Metal Mart explores the primary heat sink profile geometries, dimensional parameters, surface finishes, and applications across Indian manufacturing clusters.
The 3 Core Heat Sink Extrusion Geometries
Depending on physical enclosure space and airflow direction, three primary profile shapes dominate the electronics industry:
1. Flat-Back Comb Fin Profiles
Features a solid flat base plate on the bottom side and an array of parallel, vertical straight fins on the upper side. Components (such as MOSFETs, IGBT modules, or LED driver boards) mount directly to the flat surface.
Primary Uses: Audio power amplifiers, solar inverter rear panels, battery chargers, industrial motor drives.
2. Circular / Star LED Housings
Features a central cylindrical core surrounded by radial outward-pointing fins. The center accommodates high-power Chip-On-Board (COB) LEDs, while ambient air circulates radially between the fins.
Primary Uses: High-bay factory lighting, outdoor LED floodlights, architectural spotlights, downlights.
3. Flared & Wave Fin Sections
Fins fan outwards at tapered angles to maximize open air gap spacing between fin tips, reducing air resistance in natural convection environments where no cooling fan is present.
Primary Uses: Sealed outdoor telecom boxes, CCTV camera power modules, electric vehicle (EV) onboard chargers.
Standard Sizing & Dimensional Parameters Table
When specifying an extruded heat sink from the Jindal Aluminium Catalogue, engineers evaluate three primary physical dimensions (Width, Height, and Base Thickness):
| Profile Category | Base Width × Fin Height | Base Plate Thickness | Typical Industrial Application |
|---|---|---|---|
| Miniature Comb Fin | 50.0 mm × 15.0 mm | 3.0 mm | SMPS power supplies, PCB circuit boards |
| Medium Comb Fin | 100.0 mm × 25.0 mm | 5.0 mm | 50W–100W LED streetlights, voltage stabilizers |
| Heavy Comb Fin | 150.0 mm × 38.0 mm | 8.0 mm | Solar rooftop string inverters, audio amplifiers |
| Extra-Wide Inverter Base | 200.0 mm × 50.0 mm | 10.0 mm | Industrial VFD motor drives, EV battery chargers |
| Radial Star Housing | 80.0 mm OD × 45.0 mm | 6.0 mm Core | Commercial retail downlights, COB spotlight fixtures |
Natural Airflow vs. Forced-Air Fan Cooling
Understanding your cooling environment dictates fin spacing and profile selection:
- Natural Passive Convection: Relies on warm air naturally rising upward through the fins. Fins must be spaced with generous air gaps (typically 6mm to 10mm apart) so air can circulate smoothly without choking. Profiles should be mounted with fins oriented vertically.
- Forced-Air Cooling: Uses an electric cooling fan pushing high-velocity air directly through a closed fin tunnel. Because air is forced mechanically, fins can be placed much closer together (2mm to 4mm apart), creating enormous surface area in a compact footprint.
Surface Finishes: Black Anodized vs. Raw Mill Finish
While heat sinks are frequently supplied in Mill Finish (raw extruded silver), applying a Matte Black Anodized finish (10 to 15 microns) delivers distinct benefits:
- Thermal Radiation Improvement: A black anodized surface radiates heat up to 30% more effectively into ambient air compared to shiny silver metal in natural convection conditions.
- Corrosion Resistance: Protects fins from white oxidation in humid factory rooms and coastal industrial parks.
- Electrical Insulation: Anodizing creates an electrical insulating barrier that prevents short circuits if internal wiring touches the enclosure walls.
Frequently Asked Questions
Can heat sink profiles be cut to custom lengths?
Yes. While Jindal extrudes heat sink sections in standard 3.66-meter (12-foot) lengths, Imperial Metal Mart provides precision cold sawing services in New Delhi, cutting profiles into exact lengths (e.g., 100mm, 150mm, 200mm) ready for immediate assembly into your electronic chassis.
Why is aluminium preferred over copper for heat sinks?
While copper conducts heat faster, it is three times heavier, significantly more expensive, and extremely difficult to extrude into complex tall-fin profiles. Aluminium delivers outstanding cooling, weighs 60% less, costs far less, and can be extruded into intricate multi-fin designs impossible with copper.
How can I order Jindal heat sink sections in Delhi NCR?
Imperial Metal Mart stocks standard flat-back comb fins, LED housings, and industrial cooling profiles in Paharganj, New Delhi. You can send your dimensional drawing via WhatsApp or telephone for an instant quotation.
Source Industrial Heat Sink Profiles in Delhi NCR
Imperial Metal Mart supplies genuine Jindal Aluminium extruded cooling profiles, flat bars, and industrial sections with custom cutting across North India.