high purity tantalum foil

High Purity Tantalum Foil: 99.95% Min, ASTM B 708, Vacuum Annealed

Shaanxi Chuanghui Daye Metal Material Co., Ltd. supplies tantalum products, including cold rolled, vacuum annealed high purity tantalum foil with a minimum purity of 99.95%, produced to ASTM B 708. The reference size is 0.1 mm thick and 150 mm wide, and custom sizes are available on request. Tantalum combines a melting point of about 2996 °C with strong corrosion resistance in acid environments, which is why it is considered for electronics, semiconductor and medical applications. Orders start at 2 kg. Delivery is listed as 3 to 10 days.

Overview

This foil is made from tantalum. It is thin and flat-rolled, and it comes cold rolled and vacuum annealed. Where do people use tantalum? In parts that must stand up to harsh chemicals, or to high heat under high vacuum. Two common problems show up there. Hot acids can attack the metal. Impurities can also cause trouble in vacuum systems. For this product, the 99.95% minimum purity shown below is where your material review starts.

Specifications

The table below lists the parameters provided for this product.

Not every parameter appears in the table. Values like these are left off the page. Take thickness tolerance, or the limits on length and chemical composition. Should your project call for another thickness, width or length, just send the drawing over. We will quote the foil at the size you need.

Thermal and Chemical Properties

Tantalum melts at roughly 2996 °C. The coefficient of thermal expansion given for it is 6.3 µm/m·K. Low, as you can see. When the temperature shifts, that keeps the dimensional change small.

On the chemical side, a stable oxide layer (Ta₂O₅) forms on the tantalum surface. Thanks to that layer, the metal holds up against corrosion in plenty of acid environments. How well it really performs comes down to the acid type. Concentration plays a part, and so does temperature. Before ordering, send us the conditions you work in.

Be used in a wide range of industries.

 

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Electronic devices

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Medical implants

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Steel industry

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Chemical Processing

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Aerospace and Defense

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Energy and Environmental Engineering

Quality Standard and Purity

The foil we ship follows ASTM B 708. Purity starts at 99.95%. Purity counts for electronics and vacuum work. Trace elements can shift how the material behaves electrically. They also leave the foil brittle.

Certain elements may have limits in your process. Carbon, oxygen, nitrogen, and hydrogen are the usual ones. List those limits in your inquiry. Before the order goes in, we check the requirement. High purity tantalum foil is no substitute for validating your process. Our advice: test a sample under your own conditions.

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Electron beam melting

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Forging

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Rolling 

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Machining and forming

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Dimension inspection

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Packaging

Applications

This product is typically considered for the uses below.

Electronics and capacitors. Tantalum often acts as the anode material in electrolytic capacitors. The reason is simple. It grows a thin oxide layer that holds stable.

Semiconductor manufacturing. Tantalum foil works as a lining or a shield in vacuum deposition gear. In that setup, keeping contamination under control counts for a lot.

Medical components. The body tolerates tantalum well, and the metal shows up on X-rays. That is the reason it ends up in parts such as marker elements. Does it fit a particular medical use? Your own design work, validation, and regulatory requirements decide that.

Handling and Welding of high purity tantalum foil

Heat it in air and tantalum begins to oxidize. Most sources put the mark at roughly 300 °C and above. Brittleness can set in too. For high heat work, run the foil under vacuum or in an inert gas.

TIG (GTAW) works, and so does an electron beam. Whichever one you pick, keep the job under argon or helium that you control. That way contamination stays down.

Purchasing Considerations

Give us your size first: thickness, width and length. Your application comes next, plus any standard or documentation you need. Trial orders are fine, since the MOQ is 2 kg. Foil ships in an export wooden case.

Send your drawing along with the quote request for high purity tantalum foil, if you have one. Tell us the application too. It lets us check the condition and size against your process.

About Chuanghui Daye

The company is based in Baoji High-tech Development Zone. Our founder has more than 30 years of experience in the rare metal industry. We supply titanium, tantalum, niobium, tungsten, molybdenum, zirconium, nickel and other rare metal alloy products to the metallurgy, electronics, medical and special steel fields.

Our products have reached more than 50 countries and regions, including the United States, Germany, South Korea and Singapore.

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FAQ

Q: Can this foil be used in air at high temperatures?

A: Not without care. Tantalum starts to oxidize once it is heated in air. About 300 °C and up is the figure people usually quote. It can turn brittle as well. At high temperatures, use a vacuum or an inert gas.

Q: What does 99.95% min purity mean?

A: Purity must reach 99.95% at minimum, as the spec states. Want limits on single elements? Add them to your inquiry.

Q: Can I weld this foil?

A: Yes. TIG (GTAW) or electron beam welding can be used in a controlled argon or helium atmosphere.

Q: Can I order a custom size?

A: Sizes can be made to order. Just send a drawing with the thickness, width and length.

Q: What are the MOQ and delivery time?

A: MOQ is 2 kg. Listed delivery time runs 3 to 10 days. When you inquire, confirm the schedule for your size and quantity.

Contact Us

Send your size, quantity and application to info@chdymetal.com, and our team will review your requirements for high purity tantalum foil and reply with a quote.