Welcome to Kepai New Material
Established in May 2017, Sichuan Kepai New Materials Co., Ltd. is a high-tech pioneer specializing in R&D and production of High Conductivity Free-Cutting Tellurium Copper. Our mission is to bridge the gap between material durability and processing efficiency.
With a 29,000 sqm facility and 30+ patents, we serve over 1,000 global customers, delivering copper alloys that redefine industrial standards.
📜Technical Origins: The ASTM Evolution
The history of C14500 Tellurium Copper traces back to the 1960s in the United States, developed under ASTM standards to fill a critical void in precision machining. Before its inception, engineers faced a trade-off: use pure copper (C11000) for high conductivity but struggle with its "sticky" nature during cutting, or use brass (C36000) for easy machining at the cost of electrical performance.
Tellurium was introduced as the "magic element," creating a dispersed phase that acts as a natural chip breaker, thus birthing the high-performance alloy we rely on today for 5G, EV charging, and aerospace components.
📊Comprehensive Technical Comparison
How C14500 stacks up against other industry-standard copper alloys.
| Parameter | C14500 (Tellurium) | C14700 (Sulfur) | C11000 (Pure) | C36000 (Brass) |
|---|---|---|---|---|
| Electrical Conductivity | ≥ 93% IACS | ≥ 90% IACS | 101% IACS | 26% IACS |
| Machinability Rating | 85 (Excellent) | 85 (Excellent) | 20 (Poor) | 100 (Standard) |
| Tensile Strength (MPa) | 250 - 380 | 240 - 360 | 200 - 300 | 340 - 500 |
| Softening Temp (°C) | 350 - 400 | 300 - 350 | 150 - 200 | ~300 |
| Environmental Grade | RoHS/REACH Lead-Free | RoHS Compliant | Eco-Friendly | Contains Lead (Pb) |
| Primary Application | EV Charging, Plasma Tips | Electrical Connectors | Busbars, Transformers | Screws, Fasteners |
🔬Machining Mechanism: Burr-Free Precision
The Science of Clean Cutting
Unlike pure copper (C11000), which exhibits high ductility leading to long, stringy chips and significant burrs, C14500 creates short, brittle chips.
- 🚀 Tool Tip Heat Distribution: Tellurium reduces friction, lowering tool tip temperatures by up to 30% compared to red copper.
- ✨ Burr Elimination: The micro-cracking mechanism at the shear zone ensures a clean edge, reducing post-processing costs.
- ⏱️ Production Speed: CNC feed rates can be increased by 3-4x compared to pure copper.
🏭Domestic Industrialization & Success Cases
Breaking dependency on imported alloys through Kepai's advanced manufacturing.
Automotive Electronics
With the surge in EV adoption, our C14500 has successfully replaced high-cost European imports for High-Voltage Charging Gun terminals. Our clients report identical conductivity with 15% better machining yields.
Aerospace Connectors
Providing high-strength, heat-resistant copper solutions for signal transmission in extreme environments, achieving full domestic substitution for Tier-1 aerospace suppliers.
Plasma Cutting
Our Oxygen-Free Tellurium Copper (OFT) has become the standard for high-end plasma nozzles, doubling the service life compared to standard C14500.
🌏The China Supply Chain Edge
Supply chain stability is critical for long-term procurement. China holds 58% of the world's Tellurium mineral resources.
By sourcing from Kepai, you benefit from:
1. Direct Resource Access: Lower raw material volatility.
2. Cost Efficiency: Integrated production from smelting to finished rods reduces intermediate costs.
3. Sustainability: Our recycling processes ensure a circular economy for Tellurium-rich scrap.
🛠️Assembly & Processing Optimization
Riveting Contacts
C14500’s balanced hardness ensures that during riveting, the material flows predictably without cracking, ensuring a gas-tight seal and ultra-low contact resistance.
Stamping & Forming
While optimized for cutting, our specific "half-hard" tempers allow for precision stamping of complex contact shapes, maintaining structural integrity under high-frequency switching.
Contact Resistance
By utilizing our Oxygen-Free process, surface oxidation is minimized, reducing the need for expensive silver plating in many low-voltage applications.
📦Our Featured Product Portfolio
OFT Oxygen Free Tellurium Copper
The premium choice for high-end electronics requiring the absolute lowest oxygen content and maximum conductivity.
Learn More →
High Performance C14500 Alloy
Standard ASTM grade tellurium copper rods and plates for general precision machining and electrical components.
Learn More →
C17200 Beryllium Copper
When extreme strength (up to 1380 MPa) is required alongside conductivity. The "King" of copper alloys.
Learn More →🤝Global Presence & Trusted Partners
Exporting excellence to the US, Germany, Japan, and beyond.
Ready to Optimize Your Production?
Get a technical consultation and competitive quote for C14500 Tellurium Copper today.
ISO 9001:2015 | IATF 16949 | RoHS Compliant