Explore our premium high-conductivity copper alloys, specialized Tellurium copper rods, and high-strength Beryllium copper solutions engineered for demanding global applications.
A high-tech manufacturing leader establishing global benchmarks in high-conductivity tellurium copper, custom functional coatings, and advanced copper alloys.
Established in May 2017, Sichuan Kepai New Materials Co., Ltd. is a national high-tech private enterprise specializing in research, development, continuous casting, precision machining, and specialized coating of high-conductivity, high-strength free-cutting tellurium copper and custom copper alloys.
Driven by autonomous technological breakthroughs and proprietary intellectual property, Kepai solves the long-standing metallurgical compromise between electrical conductivity and mechanical processability. Through state-of-the-art oxygen-free melting technology and precision surface coating modifications, our custom copper products deliver superior arc resistance, high soften temperatures, and unrivaled thermal dissipation under intense operating parameters.
Comprehensive metallurgical analysis, surface modification mechanics, and structural alloy dynamics for global tier-1 industrial applications.
In modern high-power electrical systems, electric vehicle (EV) charging architectures, aerospace electronics, and plasma cutting technologies, conventional pure copper (C11000 ETP) often reaches its physical limit. While unalloyed copper offers high nominal electrical conductivity (100% IACS), it suffers from low mechanical yield strength, poor machinability (machinability rating of only 20%), susceptibility to severe oxidation at elevated temperatures, and high contact resistance over repeated mating cycles.
To overcome these engineering bottlenecks, top-tier global manufacturers rely on custom copper coating technologies combined with advanced precipitation-strengthened and free-cutting copper substrate alloys. By applying specialized functional surface treatments—such as electroplated silver, gold-over-nickel barrier layers, low-passivation electro-tin coatings, or specialized thermal barrier treatments—engineers achieve ultra-low contact resistance, elimination of oxide buildup, zero fretting corrosion, and exceptional resistance to high-voltage arc erosion.
The selection of the underlying copper substrate directly dictates the mechanical integrity and thermal endurance of coated components. Below is an authoritative technical benchmark across our primary copper alloy portfolios:
| Alloy Grade | UNS / Standard | Electrical Conductive (% IACS) | Tensile Strength (MPa) | Machinability Index (%) | Core Application Domain |
|---|---|---|---|---|---|
| Tellurium Copper | C14500 / OFT | 93.0% - 98.0% | 350 - 480 | 85% | EV Charging Pins, Plasma Torches, High-Current Connectors |
| Beryllium Copper | C17200 / C17300 | 22.0% - 28.0% | 1100 - 1380 | 50% - 60% | High-Reliability Springs, Aerospace Terminals, RF Shields |
| Beryllium Cobalt Copper | C17500 / C17510 | 45.0% - 60.0% | 680 - 880 | 50% | Resistance Welding Electrodes, Mold Inserts, Power Relays |
| Chromium Zirconium Cu | C18150 | 80.0% - 85.0% | 480 - 600 | 45% | Spot Welding Electrodes, Photovoltaic Storage Contacts |
| Nickel-Silicon Copper | C19160 | 50.0% - 60.0% | 650 - 780 | 65% | Precision Automotive Switches, High-Temp Leadframes |
| Phosphor Bronze | C51100 / C54400 | 15.0% - 20.0% | 400 - 650 | 80% (C54400) | Elastic Spring Clips, Bushings, Wear-Resistant Bearings |
| Oxygen-Free Copper | C10100 / C11000 | 100.0% - 101.0% | 220 - 330 | 20% | Vacuum Tubes, Cryogenics, Superconductive Substrates |
A. Oxygen-Free High-Conductivity Tellurium Copper (OFT & C14500):
Traditional tellurium copper often presents non-uniform telluride particle distribution, leading to anisotropy during cold extrusion and reduced fatigue life under intense electrical pulse cycles. Sichuan Kepai has pioneered an proprietary vacuum melting process that yields Oxygen-Free High-Conductivity Tellurium Copper (OFT). By controlling oxygen content below 10 ppm and dispersing sub-micron telluride (Cu2Te) phases evenly throughout the copper matrix, our alloy delivers a 85% free-cutting speed while keeping electrical conductivity above 93% IACS. When paired with custom anti-passivation coatings, this alloy prevents surface oxidation during high-current DC fast charging up to 800V/500A.
B. High-Elasticity Beryllium Copper Solutions (C17200, C17300, C17500, C17510):
Beryllium copper represents the highest strength regime among non-ferrous alloys. Through precipitation hardening (aging treatment), G.P. zones transition into fine gamma prime ($\gamma'$) precipitates, resulting in ultimate tensile strength exceeding 1380 MPa. For applications requiring micro-machining, grade C17300 incorporates trace lead additions, optimizing chip breaking without degrading fatigue strength. C17500 and C17510 offer higher thermal conductivity, serving as the industry standard for spot welding electrodes and plastic injection mold inserts where rapid heat extraction is vital.
C. Environmental Free-Machining Alternatives (C14700 Sulfur Copper & C36000 Lead Brass):
As global environmental mandates like RoHS 3 and REACH tighten guidelines on hazardous heavy metals, Sichuan Kepai provides custom sulfur copper (C14700) engineered with uniform copper sulfide (CuS) inclusion networks. C14700 matches the machining speeds of traditional brasses while eliminating toxic lead leaching, serving as an environmentally compliance-proof solution for medical fluidic connectors and drinking water sensors.
Sichuan Kepai leverages China's unparalleled industrial cluster advantages in non-ferrous metallurgy and advanced manufacturing. By integrating upstream vacuum melting, continuous horizontal casting, high-ratio hydraulic extrusion, precision multi-pass cold drawing, and zero-discharge electroplating line operations under one 29,000 m² footprint, Kepai achieves complete vertical quality control.
This integrated supply chain structure enables flexible custom alloy formulation, reduced raw material loss, rapid prototyping turnarounds (as short as 7 days), and substantial cost savings for global OEMs in North America, Europe, and Southeast Asia. Overseas buyers benefit from reliable bulk supply agreements, strict lot-to-lot consistency, and rapid scaling from small batch testing to multi-ton industrial deliveries.
Navigating global compliance frameworks requires transparent documentation and rigorous quality verification. Sichuan Kepai strictly adheres to international standard management systems, holding valid certifications for ISO9001:2015 (Quality Management), ISO14001:2015 (Environmental Management), and OHSAS 45001:2018 (Occupational Health & Safety).
Every shipment of our custom coated copper materials is accompanied by comprehensive Material Test Reports (MTRs), including EDXRF chemical composition analysis, electrical conductivity testing via eddy current meters, micro-hardness verification (Vickers/Brinell), and salt spray corrosion testing records. Furthermore, Kepai provides localized engineering consultation and custom profile extrusion design support, ensuring seamless drop-in replacement for existing global manufacturing lines.
Engineering customized copper alloy and coating solutions tailored for mission-critical components in emerging global markets.
High-conductivity tellurium copper (C14500) and coated contact pins power liquid-cooled EV charging guns, high-voltage battery junction boxes, and powertrain busbars with minimal thermal degradation.
High-elasticity Beryllium Copper (C17200) foils and wires provide vibration-resistant multipin connectors, microwave waveguides, and generator contacts operating in extreme thermal envelopes.
Specialized copper coatings and antibacterial copper surfaces serve critical diagnostic imaging systems, surgical tools, and ultra-clean medical device fluidic connections.
Corrosion-resistant copper-nickel-beryllium alloys (C17510) and marine-grade coatings resist biofouling, micro-galvanic degradation, and seawater erosion in subsea sensor housings.
Tellurium copper electrode holders and C18150 spot welding electrodes offer outstanding thermal dissipation and molten metal anti-spatter performance during continuous automated welding.
High-conductivity phosphor bronze and pure copper foil strips provide long-term structural reliability and anti-relaxation performance in solar inverter energy storage stacks.
Explore our wide array of precision drawn bars, extruded profiles, high-elastic foils, and oxygen-free copper tubing variants.
Nickel-silicon precipitation strengthened alloy featuring supreme softening resistance.
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Ideal for stamping, deep drawing, and complex electronic shell components.
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High elasticity tin-phosphorus bronze for electrical spring terminals.
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Exceptional fatigue resistance and self-lubricating machining qualities.
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Precipitation hardening alloy optimized for high-speed automatic lathe cutting.
Learn MoreUltra-thin gauge foil for precision electronic diaphragms and spring clips.
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Industry benchmark standard for extreme machinability and precision hardware.
Learn MoreHigh electrical purity copper foil engineered for EMI shielding and transformers.
Learn MoreContinuous innovation in custom alloy formulation, sustainable manufacturing, and internationally accredited quality assurance systems.
Patented oxygen-free high-conductivity tellurium copper production technology backed by independent intellectual property rights.
Certified under ISO9001:2015, ISO14001:2015, and OHSAS 45001:2018 to guarantee stringent quality and environmental stewardship.
Lead-free and low-emission manufacturing lines producing environmentally responsible copper materials aligned with RoHS 3 and REACH regulations.
Equipped with direct-reading optical spectrometers, metallographic microscopes, and electronic universal testing machines.
Continuous engineering of low-passivation, high-temperature copper alloys for EV fast-charging and 5G communications.
Active participant in formulating national and enterprise standards for specialized high-conductivity tellurium copper products.
Exporting premium customized copper alloys and surface-treated components across North America, Europe, East Asia, and the Middle East.
Expert answers regarding custom copper coating technology, alloy selection, electrical performance, and OEM procurement.
Custom copper coatings provide surface-specific property optimizations—such as ultra-low contact resistance, high temperature oxidation resistance, enhanced wear endurance, and arc erosion prevention—while retaining the superior electrical and thermal conductivity of the underlying structural copper alloy core.
Tellurium Copper (C14500) contains ~0.5% tellurium, forming tiny dispersed Cu2Te inclusions. This grants a high machinability rating of 85% without compromising electrical conductivity (93-98% IACS). It resists thermal softening and anti-galling far better than pure ETP copper during high-current mating cycles.
We strictly monitor input melt chemistry, offering lead-free free-cutting alternatives such as C14700 Sulfur Copper and low-lead/lead-free Tellurium Copper grades. All production lots undergo EDXRF spectroscopic analysis and are issued full RoHS 3 and REACH SVHC compliance documentation.
Beryllium Copper C17200 (CuBe2) provides the highest strength (tensile strength up to 1380 MPa) and fatigue limit after age hardening, making it ideal for spring clips and heavy-duty relay contacts. C17300 provides identical elastic performance with added micro-machinability.
Kepai offers full-spectrum OEM capabilities including custom alloy melting, non-standard shape extrusion drawing, heat treatment (aging/solution anneal), high-precision CNC turning, surface coating treatments, and custom length cutting.
Standard profile extrusions and alloy stock are dispatched within 7–10 days. Customized alloy formulations or high-precision machined/coated components typically require 15–20 days, backed by express air and ocean logistics options.
Discover our specialised tellurium copper materials, sulfur-bearing free-machining alloys, and heavy-duty lead brass options.
Whether you require custom tellurium copper alloy profiles, high-strength beryllium copper foils, or specialized surface coatings for high-current applications, Kepai provides comprehensive engineering support from design to delivery.
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