What is the material classification and carbon content?

It is classified as a Precious Metal with Low Carbon content, specifically a 4j29 Seamless Polished Tube.

Precision-Made Kovar Alloy with Steel Sealing Material

Name: Precision-Made Kovar Alloy with Steel Sealing Material
Brand: Huona (Shanghai) New Material Co., Ltd.
SKU: 1901733011

Shanghai, ChinaHuona (Shanghai) New Material Co., Ltd.

US$32.00

100-999 kg

US$30.50

1,000+ kg

Sample price:US$50.00/kg.Request sample

Product profile

Customization

Available

Classification

Precious Metal

Model No.

4j29

Model NO.

4J29

Type

Seamless

Status

Polished

Product Type

Tube

Material

Feni

Carbon Content

Low Carbon

PCD

98mm

Transport Package

Wooden Case

Specification

10x1

Trademark

HUONA

Origin

Shanghai

HS Code

7505120000

Production Capacity

1000 Tons/Year

Key features

Glass-to-Metal Seal: Designed for reliable sealing in light bulbs, vacuum tubes, and CRTs.

Thermal Expansion Match: Nonlinear curve matches glass to tolerate wide temperature ranges.

High Bond Strength: Cobalt oxide layer ensures strong chemical bonding with glass.

Vacuum System Compatible: Ideal for chemistry research and electronic vacuum components.

Seamless Polished Tube: 4J29 material with polished finish for precision applications.

Company profile

High Repeat Buyers ChoiceYears of Export ExperienceImporters and Exporters

Huona (Shanghai) New Material Co., Ltd.

Shanghai, China

Business Type: Manufacturer/FactoryExport Year: 2015-12-29Nearest Port: shanghaiAverage Response Time: ≤2.98hTerms of Payment: LC, T/T, D/P, etc.International Commercial Terms(Incoterms): FOB, CFR, CIF, DAT, FAS, DDP, DAP, CIP, CPT, FCA, EXW, Others

AI-Powered supplier vetting

SummaryHuona (Shanghai) New Material Co., Ltd. is identified as a private manufacturer/factory in China, operating from Shanghai, with production facilities in Xuzhou. It reports multiple management-system certifications, including ISO 9001, ISO 14001, ISO 9000, ISO 14000, and QC 080000. The supplier demonstrates documented service, complaint-handling, corrective-action, quality-assurance, and material-traceability procedures. It offers customization, ODM, and OEM services, including OEM for well-known brands, but has no SDK and reported no new products in the past year. Production information includes three or five production lines in different records and stated product outputs for heating resistance wire, thermal spray wire, and magnesium alloy. Overseas support is limited to North America debugging, with no overseas warehouse, showroom, agent, branch, or offline trade-show participation reported. Financial evidence is insufficient for assessment because the provided entries identify years rather than...

Supplier typeThe supplier is explicitly classified as a Manufacturer/Factory, privately owned, and based in China, with its operating province and address in Shanghai. This directly supports its status as a manufacturing supplier rather than only a trading or service entity.

CertificationsThe supplier reports ISO 9000, ISO 14001, ISO 9001, ISO 14000, and QC 080000 certifications under its management-system certification information. These stated certifications provide explicit evidence of formal quality, environmental, and related management-system coverage.

After-Sales capabilityThe supplier has written and followed procedures for service capability, corrective and preventive actions, and customer complaints, and reports quality assurance and material traceability. However, overseas support is limited to North America debugging, with no overseas warehouse, showroom, agent, branch, or offline trade-show participation.

R&D capabilityThe supplier reports six to ten years of R&D engineer experience and offers ODM services, but states that no new product was introduced in the past year and that no SDK is available. The evidence shows some R&D resources but also explicit limitations in recent product development and SDK support.

Production capacityThe supplier reports three production lines in one record and five in another, along with stated output quantities for heating resistance wire, thermal spray wire, and magnesium alloy. It also has five experienced export-trade staff, but does not continuously reconcile quantities for each batch or batch production, indicating a documented production-control limitation.

Customization capabilityThe supplier explicitly provides customization from designs, ODM services, and OEM services for well-known brands. These statements directly demonstrate the ability to support customer-specific and branded manufacturing requirements.

Product Q&A

Q:What is the primary application of 4J29 Kovar Alloy?

It is primarily used for reliable glass-to-metal seals in electronic devices like light bulbs, vacuum tubes, and cathode ray tubes, as well as in vacuum systems for chemistry research.

Q:Why is 4J29 suitable for sealing with glass?

4J29 has a thermal expansion coefficient similar to glass, allowing the joint to tolerate wide temperature ranges without cracking due to differential expansion stresses.

Q:How does the chemical bonding process work?

It bonds to glass via an intermediate oxide layer of nickel oxide and cobalt oxide. The presence of cobalt makes this layer easier to melt and dissolve in molten glass.

Q:What indicates a good seal visually?

A grey, grey-blue, or grey-brown color indicates a good seal. Metallic color indicates lack of oxide, while black indicates overly oxidized metal, both leading to weak joints.

Q:What are the common names for 4J29 alloy?

Common names include Kovar, Nilo K, KV-1, Dilver Po, and Vacon 12.