Precision Kovar Machining for High-Tech Equipment
Kovar® is an iron-nickel-cobalt alloy engineered for one signature property: its thermal expansion matches borosilicate glass — which is why it is the material of choice for glass-to-metal seals in optical, electronic and vacuum packages. Machining it well starts with chemistry you can trust.
Why equipment manufacturers choose us
Chemistry verified at the door
Kovar's expansion behavior depends on its Ni/Co balance. Every incoming batch is checked on our benchtop spectrometer against the specified grade — before it touches a machine.
Tight tolerance on a demanding alloy
±0.005 mm typical on machined features, surface finish down to Ra 0.2 µm — with tooling and parameters matched to tough, work-hardening Fe-Ni-Co.
Documentation for regulated builds
EN 10204 3.1 certificates, batch traceability and Zeiss CMM dimensional reports — standard, not extras.
Kovar Machining
Real capability windows — verified in-house, not estimated.
| Capability | Specification |
|---|---|
| Material | Kovar® (Fe-Ni-Co glass-sealing alloy), grade verified per batch |
| Typical tolerance | ±0.005 mm typical on machined features · confirmed per drawing |
| Surface finish | Down to Ra 0.2 µm |
| Processes | CNC milling, turning, Swiss-type for small parts |
| Inspection | Zeiss CMM + spectrometer chemistry verification |
| Certificates | ISO 9001:2015 · IATF 16949:2016 · EN 10204 3.1 |
| Prototype lead time | Typically 5–10 working days |
Materials we machine
From Drawing to Delivered Part
A transparent, engineering-led process built for long-term supply programs — not one-off transactions.
Submit & Review
Send drawings and program context. Our engineers run a DFM review and flag tolerances, materials and risk before any cutting begins.
Quote & Material Plan
You receive a transparent quote plus a material-verification plan — grade, EN/DIN check and certificate strategy for your application.
Machine & Inspect
In-house precision machining, then Zeiss CMM dimensional inspection and spectrometer material verification on critical batches.
Deliver & Support
Kitted, ESD-safe or ISO Class 7 cleanroom packaging, with local engineering and after-sales support through our German partner.
Parts we have made
Photographs of parts machined at our Shenzhen plant. Send us your drawing and we will confirm the process route for parts like these.
Frequently asked questions
Request a Quote
Tell us about your program. The fields below help our engineering team prioritize recurring, long-term supply programs with equipment manufacturers.
What happens after you send your files
- Within 1 business day an engineer — not a salesperson — reviews your drawings and replies.
- DFM review: tolerances, material and risk flags, before any cutting begins.
- Your quote includes a material-verification plan: grade, EN/DIN check, certificate strategy.
Critical features are verified in house · material chemistry confirmed by spectrometer · EN 10204 3.1 certificates available.
Prefer email? Write to us directly at info@prototech-machining.com
Our form captures production type, annual quantity and project status up front — so we can focus engineering resources on long-term supply relationships, not one-off inquiries.
Talk to our team about special materials, tolerances or a failed-supplier recovery before you send drawings.