4J42 Fe-Ni Sealing Alloy Bright Bar
4J42 Fe-Ni Sealing Alloy Bright Bar (product code PT-XHA-PRA-00066) 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. Controlled thermal expansion matched to soft glasses and ceramics makes Fe-42Ni the common alloy for lead frames and glass-to-metal seals. Prices are quoted on request.
| Product code | PT-XHA-PRA-00066 |
|---|---|
| Category | Industrial Products & MRO > Special Alloys > Precision Alloys |
| Grade / designation | GB/T 15018 4J42; comparable to Alloy 42 (UNS K94100), ASTM F30 |
| Product form | Bar & Rod |
| Applicable standards | GB/T 15018, ASTM F30 (confirmed per order) |
| Available forms | Bright bar, wire, strip |
| 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
Controlled thermal expansion matched to soft glasses and ceramics makes Fe-42Ni the common alloy for lead frames and glass-to-metal seals. PANDA COLLECTIONS sources 4J42 (Fe-42Ni) 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 41.0–42.5, Co ≤1.0, Mn ≤0.8, Si ≤0.3, C ≤0.05, Fe bal. |
|---|---|
| Mechanical properties | Wire: soft <590 MPa, hard >820 MPa; strip: soft <570 MPa, hard >700 MPa |
| Physical properties | Mean CTE 4.0–5.0 ×10⁻⁶/°C (20–300 °C), 6.5–7.5 ×10⁻⁶/°C (20–450 °C) |
Typical applications
- IC lead frames
- Glass-to-metal seals
- Thermostat bimetals
- Ceramic-metal assemblies
Industries: Electrical & Electronics, Semiconductors
Updated October 27, 2026
Frequently asked questions
What is 4J42 (Fe-42Ni) used for?
IC lead frames, glass-to-metal seals, thermostat bimetals, ceramic-metal assemblies.
Which standards apply to 4J42 (Fe-42Ni)?
GB/T 15018, ASTM F30. Compliance, testing and certificates are confirmed for each order.
What forms and sizes of 4J42 (Fe-42Ni) are available?
Bright bar, wire, strip. Sizes are cut or produced to order.
How do I get a price for 4J42 Sealing Alloy Bright Bar?
Prices are not published. Request a customised quotation from PANDA COLLECTIONS with the product code PT-XHA-PRA-00066, 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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