China Manufacturer Precision Kovar 4J29 Alloy Tube for Hermetic Sealing

Product Description

As a leading China manufacturer and supplier of Precision Alloy s, DLX Alloy specializes in producing high-performance Kovar 4J29 alloy tubes designed for hermetic sealing applications. Kovar 4J29 is a controlled expansion alloy known for its excellent match to the thermal expansion coefficient of borosilicate glass and alumina ceramics, making it indispensable in vacuum sealing, electronic packaging, and high-reliability assemblies. Our precision Kovar tubes are manufactured to exacting standards, ensuring minimal leakage rates and superior weldability for demanding environments in aerospace, telecommunications, and medical devices.

With years of expertise in Precision Alloy Tube fabrication, DLX offers Kovar 4J29 seamless tubes in custom diameters from 0.5mm to 50mm, wall thicknesses from 0.1mm to 5mm, and lengths up to 6000mm. All products undergo rigorous testing for dimensional accuracy, surface finish, and metallurgical integrity. Contact us today for competitive pricing on China Kovar alloy tubes and reliable global shipping.

chemical composition

Key Features

Our Factory Price 4J29 Kovar Precision Alloy Tube stands out due to its unique properties tailored for high-precision engineering:

• Matched Thermal Expansion: Coefficient of thermal expansion (CTE) of 4.7-5.2 × 10⁻⁶/K (20-500°C), perfectly suited for glass-to-metal and ceramic-to-metal seals to prevent cracking under thermal cycling.

• Seamless Construction: Extruded or drawn seamless design eliminates welds, reducing potential leak paths and enhancing pressure integrity up to 10⁻⁹ atm·cc/sec helium leak rate.

• High Purity and Consistency: Vacuum induction melted and hot-rolled for low impurities, ensuring reliable hermetic performance in vacuum environments.

• Excellent Weldability and Machinability: Compatible with electron beam, TIG, and laser welding; easy to machine for custom flanges and fittings.

• Corrosion Resistance: Good resistance to oxidation and moisture in inert atmospheres, ideal for long-term reliability in sealed components.

• Customizable Specifications: Available in annealed, bright annealed, or oxidized finishes; tolerances as tight as ±0.01mm for precision applications.

Packaging and shipping

FAQ

What are your working hours and contact information? 

Monday to Saturday: 7:30 a.m. to 5:00 p.m. (Beijing Time, GMT+08:00). May 1st to 3rd are public holidays, as well as October 1st to 7th and the Lunar New Year holiday. If you have any questions, please email us during the holiday period. 

Do you offer free samples?

Yes, we can provide free samples for testing. The buyer is responsible for all the shipping costs. 

What are your payment terms?

Wire transfer, letter of credit, deposit, deposit, deposit, Western Union, Speedy Money, PayPal 

What is the delivery time?

Usually, the delivery time for samples is 7 days after the payment is confirmed.