Indium Foil

Excellent Thermal Conductivity

• Provides efficient heat transfer.
• Ideal for thermal interface applications.
• Maintains performance in demanding environments.

Superior Ductility & Compressibility

• Easily conforms to irregular surfaces.
• Creates reliable seals.
• Requires minimal pressure for bonding.

Low Melting Temperature

• Melting point of approximately 156.6°C.
• Suitable for low-temperature soldering.
• Protects temperature-sensitive components.

Excellent Electrical Conductivity

• Provides reliable electrical connections.
• Suitable for electronic applications.
• Compatible with semiconductor devices.

Outstanding Wetting Properties

• Bonds well with glass, ceramics, metals, and semiconductor materials.
• Improves interface contact.
• Reduces thermal resistance.

High Purity Material

• Low impurity content.
• Suitable for sensitive electronic applications.
• Consistent performance.

Property	Specification
Product Name	Indium Foil
Chemical Symbol	In
CAS Number	7440-74-6
Appearance	Silver Metallic Foil
Purity	99.95%–99.999% Available
Melting Point	156.6°C
Density	7.31 g/cm³
Thickness	0.025 mm – Custom Available
Width	Custom Width Available
Temper	Soft / Annealed
Surface Finish	Smooth Metallic Finish
Packaging	Cleanroom Packaging Available
Certification	Certificate of Analysis (COA) Available

• 99.95% Purity Grade
• 99.99% Purity Grade
• 99.999% Ultra High Purity Grade
• Semiconductor Grade
• Electronic Grade
• Thermal Interface Grade
• Solder Grade
• Research Grade
• Laboratory Grade

Available forms:

• Indium Foil Rolls
• Indium Foil Sheets
• Indium Strips
• Custom Die-Cut Shapes
• Custom Gaskets
• Precision Cut Foil Components

Available thicknesses:

• 0.025 mm
• 0.05 mm
• 0.10 mm
• 0.15 mm
• 0.25 mm
• Custom thickness available

• Thermal interface materials
• Semiconductor packaging
• Cryogenic seals
• Vacuum seals
• Electronic bonding
• Soldering applications
• RF and microwave devices
• Photonics and optical components

1. What is indium foil?

Indium foil is a thin sheet of high-purity indium metal known for its softness, ductility, thermal conductivity, electrical conductivity, and excellent sealing properties. It is commonly used in electronics, semiconductor, and vacuum applications.

2. What industries use indium foil?

Indium foil is used in semiconductor manufacturing, electronics assembly, aerospace, cryogenic systems, thermal management, vacuum technology, and scientific research.

3. Why is indium foil used as a thermal interface material?

Indium foil provides excellent thermal conductivity and conforms to surface irregularities, creating a low-resistance thermal path between components without requiring high compression forces.

4. What thicknesses of indium foil are available?

REG Metals supplies indium foil in standard and custom thicknesses, including thin foil, strips, sheets, and precision-cut components based on customer requirements.

5. Does REG Metals provide a Certificate of Analysis (COA)?

Yes. Every shipment can be supplied with a Certificate of Analysis (COA), chemical composition reports, dimensional inspection data, and complete lot traceability.

6. Can REG Metals supply custom indium foil shapes?

Yes. REG Metals provides custom-cut indium foil components including gaskets, washers, strips, and precision shapes for research and industrial applications.