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Heavy Copper PCB Manufacturing
By plating or laminating copper to 4–20 oz (140–700 µm), we deliver current-carrying capability of 100–300 A per trace, thermal resistance ≤ 0.15 °C/W, and excellent shock resistance—ideal for high-current, high-power applications.
- Multiple material choices
- Max panel size: 54 inches
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Our Heavy Copper PCB Capabilities
Heavy Copper PCBs are widely used in EV battery-management systems, PV inverters, industrial power supplies, and high-power LEDs. Zintilon provides advanced heavy-copper fabrication from prototyping to small-batch production. From material cutting to final packaging, we offer efficient, reliable manufacturing solutions.
Heavy Copper PCB Materials
| Category | Typical Grade / Build-up | Key Performance |
| Copper foil | RTF, RA, ED (Ra ≤ 3 µm) | 58 MS/m conductivity, thermal shock resistant |
| Resin system | High-Tg FR-4 (Tg 170 °C) | Tg 170–180 °C, low ΔT warpage |
| Polyimide (PI) | Tg ≥ 250 °C, flexible, 300 °C solderable | |
| Epoxy + filler (EM827, EXB-HT) | 70 % filler, CTE 11 ppm, 150 °C rated | |
| Reinforcement | Standard E-glass 2116/7628 | Low cost, CTE 16 ppm |
| Low-CTE aramid non-woven | CTE 6 ppm, density 1.3 g/cm³ | |
| Carbon-fiber / carbon-composite | In-plane λ 30–325 W/m·K, CTE –1.5–4 ppm | |
| Metal core / base | Aluminum IMS (5052/6061) | λ 1–2 W/m·K, light |
| Copper base (C1100) | λ 390 W/m·K, CTE 17 ppm | |
| Cu-Mo-Cu (CMC) laminate | λ 150–220 W/m·K, CTE 5.6–7 ppm | |
| Ceramic DBC (Al₂O₃/AlN) | λ 24–170 W/m·K, CTE 4.5–7 ppm | |
| Plug / fill resin | High-thermal epoxy plug (3 W/m·K) | CTE 18 ppm, 150 °C rated |
| Copper-paste plug | 3×10⁻⁵ Ω·cm, λ 20 W/m·K |
Heavy Copper PCB Surface Finishes
| Finish | Typical Thickness | Features |
| HAL-LF SnCu/Ni | 1–2 µm | Low cost, reworkable, good wetting |
| ENIG | Ni 3–5 µm + Au 0.05–0.1 µm | Flat, environmental, Al-wire bondable |
| ENEPIG | Ni 3–5 µm + Pd 0.05–0.1 µm + Au 0.03–0.05 µm | Sn solder + Al/Au wire, Pd blocks Ni migration |
| Immersion Ag | 0.15–0.3 µm | Low loss, flat, sulfur-sensitive |
| Immersion Tin | 0.8–1.2 µm | Compatible with any solder, flat |
| OSP | 0.2 µm | Lowest skin-effect, cheapest |
| Electroplated Hard Gold | Ni 3–5 µm + Au 0.5–1.5 µm | ≥10 000 plug cycles |
| Mixed finish | e.g., ENIG + selective hard gold | Solder + plug in one pass |
Why Choose Our
Heavy Copper PCB Services?
One-on-One Quotation
Upload your Gerber files and get a quote within 24 hours. Our engineers review your design to avoid misunderstandings and offer competitive pricing.
High-Quality Production
We strictly control materials, processes, surface finishes, AOI, and flying probe tests to ensure consistent quality from prototype to mass production.
Fast Delivery
With advanced equipment and a professional team, we prioritize your order based on complexity and urgency.
Instant Communication
We provide full technical support from quote to delivery. We respond quickly to any questions until you receive your PCBs and are fully satisfied.
Heavy Copper PCB Standards
We follow the tolerance standards of ISO 2768 (medium grade, fine grade) and ISO 286 (grade 8, 7, 6). You are welcome to emphasize it in the drawings or communicate with the sales for higher precision needs. We follow ISO2768m by default in the absence of special requirements.
Industry
Copper-Weight Range
Key Advantages
Automotive electronics
Recommended 4–12 oz
Basis 300 A load, –55~125 °C full temp
PV / energy storage
Recommended 6–20 oz
Basis ΔTj ↓20 °C, efficiency ↑1.5 %
5G / computing
Recommended 4–8 oz
Basis 12 V bus 150 A, back-drill stub ≤0.05 m
Aerospace & defense
Recommended 6–20 oz
Basis Class 3 qual, radiation tolerant
Heavy Copper PCB Guidelines
Ensure precise tolerances, select appropriate materials, maintain clear CAD designs, and follow toolpath optimization for best results. Zintilon delivers accuracy, quality, and consistency in every machined part.
Parameter
Recommended
Basis
Min trace width
Recommended ≥0.3 mm (3 oz)
Basis Current + etch capability
Min spacing
Recommended ≥0.25 mm (3 oz)
Basis Prevents under-etch sliver
Mounting-hole ring
Recommended ≥0.4 mm
Basis Anti-tear
Power-device gap
Recommended ≥5 mm
Basis Thermal isolation
Board-edge copper
Recommended ≥3 mm (special 1.5 mm)
Basis Prevents burr short
Our Custom Heavy Copper PCB for Various Industrial Applications
Prototyping and production parts from Zintilon have been applied to the various walks of life. The brilliant custom CNC machining service simplifies the process of obtaining good-quality production parts.
Heavy Copper PCB FAQs
Our maximum CNC machining part size is 3000 mm x 2200 mm x 1100 mm.
Our CNC machining standard tolerances range from plus or minus 0.001mm.
The cost of CNC machining is determined by the material, machining costs, labor costs, and the tooling and surface finish involved. Feel free to contact us for a quick quote.
Got any more questions?
Ultimate Guide
to Heavy Copper PCB
to Heavy Copper PCB
Heavy Copper PCB Manufacturing
Various and Robust CNC Machining Services
Process 1
Prototyping
Zintilon's rapid prototype service bridges the gap between product concept and market during the product development. Advanced CNC machines such as Hermle 5 axis cnc milling centers, multiple international certifications, and top-notch CMM inspection ensure the accuracy and details of the prototype, meeting high standards of quality requirements.
- Advanced Technology: CNC, CMM inspection, elite engineers etc.
- Quick Response: full support to ensure problem solved.
- Customized service: customize precision machining solutions
Process 2
Production
Zintilon's on-demand production solution provides customers with a modern, efficient and customer-oriented production solution through its flexibility, high quality standards by our robust supply network and self-owned CNC shop, strict quality control inspection, etc.
- Reasonable planning: precision resource allocation to ensure quick cycle time.
- Machining SOP : advanced technology and strict QC processes.
- Flexible Production: from rapid prototyping (1-20pcs) to low-volume production (20-1000pcs).
Let’s Build Something Great, Together
