4J29 Fe-Ni-Co Glass-Sealing Alloy Strip
4J29 Fe-Ni-Co Glass-Sealing Alloy Strip (product code PT-XHA-PRA-00034) is listed under Industrial Products & MRO > Special Alloys > Precision Alloys and supplied in Singapore by PANDA COLLECTIONS (PANDATEC PTE. LTD.), a B2B procurement partner for businesses. Its thermal expansion closely matches borosilicate hard glass and its dense oxide wets well, making it the standard alloy for glass-to-metal hermetic seals. Prices are quoted on request.
| Product code | PT-XHA-PRA-00034 |
|---|---|
| Category | Industrial Products & MRO > Special Alloys > Precision Alloys |
| Grade / designation | GB/T 15018 4J29; comparable to ASTM F15 (KOVAR® type) |
| Product form | Strip & Coil |
| Applicable standards | GB/T 15018, YB/T 5231, ASTM F15 (confirmed per order) |
| Available forms | Strip, wire, plate, forged and hot-rolled bar, tube |
| Certificates | EN 10204 3.1 MTC on request |
| Minimum order | On request |
| Country of origin | China |
| Pricing | On request – customised quotation by PANDA COLLECTIONS |
| Supplied in | Singapore |
Product description
Its thermal expansion closely matches borosilicate hard glass and its dense oxide wets well, making it the standard alloy for glass-to-metal hermetic seals. PANDA COLLECTIONS sources 4J29 (Fe-29Ni-17Co) for buyers in Singapore and internationally for project and bulk orders. Mill test certificates to EN 10204 3.1, full heat traceability, melting route (e.g. ESR/VAR), heat-treatment condition and NDT/testing requirements are confirmed per enquiry. Prices are not listed online; every order is quoted individually based on grade, dimensions, quantity, testing and certification requirements.
Technical data
| Chemical composition (%) | Ni 28.5–29.5, Co 16.8–17.8, Mn ≤0.5, Si ≤0.3, C ≤0.03, Fe bal. |
|---|---|
| Mechanical properties | Rm ≥450 MPa, Rp0.2 ≥350 MPa, A5 ≥25 %, HB ≤190 (annealed) |
| Physical properties | Density 8.3 g/cm³; expansion matched to borosilicate hard glass from 20–450 °C |
Typical applications
- Vacuum electronic devices
- Transistor and IC leads and housings
- Hermetic connectors and relay headers
Industries: Electrical & Electronics, Aerospace, Telecommunications
Updated October 27, 2026
Frequently asked questions
What is 4J29 (Fe-29Ni-17Co) used for?
Vacuum electronic devices, transistor and IC leads and housings, hermetic connectors and relay headers.
Which standards apply to 4J29 (Fe-29Ni-17Co)?
GB/T 15018, YB/T 5231, ASTM F15. Compliance, testing and certificates are confirmed for each order.
What forms and sizes of 4J29 (Fe-29Ni-17Co) are available?
Strip, wire, plate, forged and hot-rolled bar, tube. Sizes are cut or produced to order.
How do I get a price for 4J29 Glass-Sealing Alloy Strip?
Prices are not published. Request a customised quotation from PANDA COLLECTIONS with the product code PT-XHA-PRA-00034, size, quantity, testing and certificate requirements, and delivery address.
Can mill test certificates be provided?
Mill test certificates to EN 10204 3.1 with heat traceability can be requested. Melting route (e.g. ESR/VAR), heat-treatment condition and NDT requirements are confirmed per enquiry.
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