Precision Kovar Sealing Solutions for Extreme Environments
China Professional Manufacturer of Vacuum Kovar Precision Parts
Nanjing Kovar Precision Technology Co., LTD
Precision Process Material Processing
Covers the blanking, punching, stretching, CNC machining, surface treatment, and can do sealing welding processing.(glass and ceramic material)
Kovar
4J29 / ASTM F15 / JIS EMAS-1001 / 4J33 / 33HK / NI33CO17 / KV-4 / NI33CO14 / C0257
Stainless steel
304 / SUS304
Nickel
N6 / Nickel200 / Nickel99 / JIS NW2200 / EN 2.40601
Tantalum
TA1 / GR1 / BT1-0 / JIS TI1
KOVAR (Kovar alloy) is an iron-nickel-cobalt-based alloy (with a typical composition of 29% Ni, 17% Co, and a surplus of Fe). Due to its coefficient of thermal expansion highly matching that of borosilicate glass (about 5-10 ppm/K), it has become the core material for glass-metal seals.
KOVAR (iron-nickel-cobalt alloy) plays a core role in ceramic-metal seals by taking advantage of its thermal expansion coefficient that matches specific ceramics (such as alumina and beryllium oxide) to achieve reliable connections with high air tightness and high temperature resistance. It is a key material for critical packaging technologies in aerospace, high-end electronics and other fields.
Kovar Machining Services
Kovar alloy—renowned for its ultra-low thermal expansion coefficient and exceptional compatibility with glass, ceramics, and other materials in high-temperature environments—requires specialized machining expertise to unlock its full potential. Our Kovar CNC Machining Services are engineered to meet the rigorous demands of industries where precision, thermal stability, and material integrity are non-negotiable.
About us
providing high-precision stamping parts solutions.
Nanjing Kovar Precision Technology Co., Ltd. specializes in the design, production and sales of Kovar material stamping parts, serving the medical, semiconductor, industrial testing, vacuum devices and other industries, and providing high-precision stamping parts solutions.
- Medical instrument parts
- Semiconductor parts
- Vacuum kovar precision devices
Provide for you
Application Scenario Solutions
feedthroughs vacuum connector
Feedthrough is a sealed device that can pass through the walls of a vacuum chamber and transmit direct current, radio frequency (microwave) power, and signals in the atmosphere and vacuum. Feedthrough are widely used in various fields such as scientific research, semiconductor manufacturing, aerospace, optical equipment, chemical industry, and medical equipment.
Medical industry
For example：
X-ray machine ball tube components
Semiconductor industry
For example：
Night vision device accessories
Industrial testing
For example：
Chip testing machine
Vacuum device industry
For example：
High-temperature tubes in solar energy
Why Choose Us?
Our Commitment to Excellence
Expertise in Kovar Precision Stamping
With over ten years of specialized focus on Kovar/alloy processing, we master the unique challenges of this low-expansion material. Our advanced stamping techniques ensure micron-level accuracy, ideal for critical applications in electronics, aerospace, and hermetic sealing components.
End-to-End Quality Assurance
From material certification to final inspection, our ISO-certified processes guarantee defect-free components. Rigorous testing (including dimensional checks, leak tests, and thermal validation) ensures compliance with international standards and your project’s exact specifications.
Responsive Engineering Partnership
We deliver more than parts – we provide solutions. Our technical team collaborates closely with clients from prototyping to mass production, offering DFM feedback and fast-turn samples. Flexible MOQs and 24/7 project support keep your supply chain agile.
The equipment covers high-precision stamping machines, hydraulic stretching machines, CNC lathes, CNC machining centers, surface grinders, grinding machines, ultrasonic cleaning machines, magnetic polishing machines, electron microscope detectors, three-coordinate measuring instruments, drying ovens, etc., supporting the production from small precision parts to medium-sized structural parts.
Our Advanced Equipment
Tell us your product customization requirements.
Contact us today to schedule a consultation or to learn more about our services.
Contact Us
Address
Liuhe High-tech Development Zone, Nanjing City, Jiangsu Province, China
info@prekovar.com
Phone / WhatsApp
+86 13182805054
Frequently Asked Questions
- Low thermal expansion rate (matching glass/ceramic, ideal for hermetic sealing)
- Good machinability, weldability and formability
- High corrosion resistance and mechanical stability at high/low temperatures
- Suitable for precision processing of small, complex components (e.g., electronic connectors, vacuum devices)
- CNC turning/milling: Tolerance up to ±0.001mm, support micro-scale feature processing (e.g., tiny holes, thin walls)
- Grinding (surface/centerless grinding): Surface roughness Ra ≤ 0.2μm
- Laser cutting/engraving: For complex shapes and precise marking
- Hermetic sealing (glass-to-metal/ceramic-to-metal bonding): Leak rate ≤ 1×10⁻⁹ mbar·L/s
- Heat treatment: Stress relief and performance optimization for Kovar alloys
- Aerospace & aviation: Satellite connectors, avionics hermetic packages
- Semiconductor: Vacuum chambers, wafer processing equipment parts
- Telecommunications: RF connectors, microwave device components
- Medical devices: Precision sensors, hermetic medical instrument housings
- Electronic packaging: Hermetic headers, transistor bases
- Raw material inspection: Verify Kovar alloy composition (Ni 29%, Co 17%, Fe balance) via spectral analysis before processing
- In-process inspection: 100% dimensional check with CMM (Coordinate Measuring Machine), optical comparator
- Final inspection: Helium leak testing (for sealed components), surface defect detection, thermal expansion coefficient verification
- Certification: Provide material certificates (Mill Test Report), inspection reports, and comply with ASTM F15, DIN 17744 standards
- MOQ: Flexible, 1 piece for prototype/custom samples; 100 pieces for mass production (negotiable for large orders)
- Lead time: Prototypes (3-5 working days); Mass production (7-15 working days, depending on complexity and quantity)
- Rush order: Support urgent processing (1-3 working days for small batches) with confirmed requirements
- Accept drawing formats: PDF, DWG, STEP, IGES, SolidWorks
- Engineering support: Our R&D team can optimize designs for manufacturability (DFM) to reduce costs and improve precision
- Sample confirmation: Provide free sample inspection (you only bear shipping costs) before mass production
- Passivation: Enhance corrosion resistance
- Gold plating/nickel plating: Improve conductivity and solderability (plating thickness 0.5-5μm customizable)
- Glass sealing: Hermetic bonding with borosilicate glass (e.g., Pyrex 7740)
- Sandblasting/polishing: Adjust surface finish (Ra 0.1-1.6μm)
- Packaging: Anti-static PE bags + foam protection + waterproof cartons (or customized packaging for precision components: vacuum-sealed, anti-rust oil coating)
- Shipping: DHL/FedEx/UPS for small batches (3-7 days to global destinations); Sea freight for large orders (cost-effective, 20-30 days)
- Tracking: Provide full shipping tracking numbers and customs clearance documents (commercial invoice, packing list, CO if required)
- 12-month quality warranty for mass-produced components (free rework/replacement for non-conforming parts caused by our processing)
- Technical consultation: 24-hour response to usage, installation, or performance issues of Kovar components
- Long-term cooperation: Provide cost reduction suggestions for repeat orders based on production data
- ISO 9001:2015 quality management system certification
- RoHS/REACH compliance (for export to EU markets)
- AS9100 (aerospace industry certification, optional for aerospace-grade components)
- FDA registration (for medical-grade Kovar components)
NEWS
Surface Treatment Processes for Kovar Precision Stamped Components
