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4J29 Kovar Alloy Sheet for Glass-to-Metal Sealing ASTM F15
4J29 Kovar Alloy Sheet for Glass-to-Metal Sealing ASTM F15
Specifications
Brand Name :
HUONA
Model Number :
PLATE
Certification :
ISO9001
Place of Origin :
CHINA
MOQ :
1KG
Price :
Negotiation
Payment Terms :
T/T
Supply Ability :
1000kg Per Week
Delivery Time :
WEEK
Packaging Details :
1500tons/Year
Model NO. :
Expansion Alloy
Transport Package :
DIN Spool, Carton, Wooden Case
HS Code :
7505220000
Purity :
Alloy
Production Capacity :
1500tons/Year
Origin :
Jiangsu, China
Coefficient of Expansion :
5.0 × 10⁻⁶ /°C (30–400°C~)
Surface Finish :
Bright, Cold-Rolled, Ground, or Annealed Matte
Description

Product Description

4J29 alloy sheet, also known internationally as Kovar alloy (UNS K94610, ASTM F15), is a nickel-iron-cobalt alloy with controlled thermal expansion characteristics. It is widely used in hermetic sealing applications due to its precisely matched coefficient of expansion with hard glass and ceramics.

The alloy maintains dimensional stability across a wide temperature range, making it ideal for use in electronic components requiring tight tolerances and vacuum integrity. Typical applications include glass-to-metal seals in transistors, vacuum tubes, integrated circuits, microwave packages, and optical housings.

Available in cold-rolled or annealed condition, 4J29 sheets offer excellent workability, uniform grain structure, and high surface finish for precision forming and sealing processes.

4J29 Kovar Alloy Sheet for Glass-to-Metal Sealing ASTM F15

Key Features

  • Matched thermal expansion with borosilicate and aluminosilicate glasses

  • Excellent hermeticity and vacuum sealing performance

  • Stable mechanical properties across temperature ranges

  • Easily machined, deep drawn, or stamped

  • Good oxidation resistance in air

  • Compliant with ASTM F15 and GB/T 14986 standards

Typical Applications

  • Hermetic glass-to-metal seals

  • Electronic packaging (IC, transistor, diode headers)

  • Microwave devices and optical components

  • Relay housings, vacuum tubes, and sensor shells

  • Aerospace and communication electronics

Chemical Composition (%)

Element Content (%)
Nickel (Ni) 29.0 ± 1.0
Cobalt (Co) 17.0 ± 1.0
Iron (Fe) Balance
Silicon (Si) ≤ 0.3
Manganese (Mn) ≤ 0.5
Carbon (C) ≤ 0.05
Chromium (Cr) ≤ 0.2
Phosphorus (P) ≤ 0.015
Sulfur (S) ≤ 0.015
Aluminum (Al) ≤ 0.1
Copper (Cu) ≤ 0.2

Mechanical Properties (Annealed)

Property Typical Value
Tensile Strength ≥ 450 MPa
Yield Strength ≥ 300 MPa
Elongation (L=50 mm) ≥ 20%
Hardness (HV) ≤ 200 HV
Density 8.3 g/cm³
Coefficient of Expansion 5.0 × 10⁻⁶ /°C (30–400°C~)
Melting Range 1450 – 1500°C
Electrical Resistivity ~0.42 μΩ·m

Available Specifications

Item Details
Thickness Range 0.05 mm – 5.0 mm (custom sizes available)
Width Up to 600 mm (slit widths available)
Length Up to 3000 mm (or coils upon request)
Surface Finish Bright, Cold-Rolled, Ground, or Annealed Matte
Tolerance Thickness: ±0.01 mm; Width: ±0.5 mm (custom precision available)
Delivery Condition Annealed / Stress Relieved / Pickled
Packaging Vacuum sealed + export wooden case; rust-preventive wrap included
Certification ISO 9001 / Material Certificate (EN 10204 3.1/3.2) / RoHS / REACH
Country of Origin China (OEM support available)

Optional Services:

  • Custom stamping or laser cutting

  • Surface cleaning for vacuum applications

  • Pre-punched or slotted formats

  • Cleanroom packaging

    4J29 Kovar Alloy Sheet for Glass-to-Metal Sealing ASTM F15
    4J29 Kovar Alloy Sheet for Glass-to-Metal Sealing ASTM F15
    4J29 Kovar Alloy Sheet for Glass-to-Metal Sealing ASTM F15



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4J29 Kovar Alloy Sheet for Glass-to-Metal Sealing ASTM F15

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Product Detail
Brand Name :
HUONA
Model Number :
PLATE
Certification :
ISO9001
Place of Origin :
CHINA
MOQ :
1KG
Price :
Negotiation
Contact Supplier
4J29 Kovar Alloy Sheet for Glass-to-Metal Sealing ASTM F15

Huona (Shanghai) New Material Co., Ltd.

Verified Supplier
1 Years
shanghai, shanghai
Since 2008
Business Type :
Manufacturer, Exporter
Main Products :
Low Expansion Alloy, Soft Magnetic Alloy, Elastic Alloy
Total Annual :
8000000-100000000
Employee Number :
100~120
Certification Level :
Verified Supplier
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