Hafnium

CAS 7440-58-6HfMetal & Ceramic Science

Hafnium (Hf, CAS: 7440-58-6), with a molecular weight of 178.49 g/mol, is a lustrous, silvery-grey transition metal. It is exceptionally resistant to corrosion, even in boiling acids. Hafnium finds critical applications in nuclear reactors due to its low neutron absorption cross-section and in the manufacturing of specialised alloys and high-temperature materials.

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Hafnium (Hf) — chemical element, CAS 7440-58-6; Materials Science, fine chemical supplied by Tech Serve Solutions

HafniumMaterials ScienceMetal and Ceramic ScienceMetals

01 /Applications

Nuclear Reactors

Hafnium is extensively used in the construction of control rods for nuclear reactors due to its remarkable ability to absorb neutrons. Its low neutron absorption cross-section makes it an ideal material for regulating nuclear fission.

Superalloys and High-Temperature Materials

Due to its high melting point and excellent corrosion resistance, hafnium is incorporated into superalloys designed for extreme environments, such as jet engine components and gas turbines.

Semiconductor Industry

Hafnium oxides have been explored and utilised as high-k dielectric materials in advanced microelectronic devices, enhancing transistor performance.

Zirconium Production

As hafnium is chemically similar to zirconium and often found together, it plays a role in processes related to zirconium refining and separation.

02 /Properties

Molecular weight	178.49
Empirical formula	Hf
Assay	≥99.9% trace metals basis (purity excludes ~2% zirconium)
Form	turnings, crystal bar
Boiling point	4602 °C(lit.)
Density	13.3 g/cm3(lit.)
Melting point	2227 °C(lit.)

03 /Safety & handling

GHS hazard pictogram: Flammable (GHS02) — Flammable

Danger

Hazard statements

H228Flammable solid

Precautionary statements

P210Keep away from heat, sparks and open flames. No smoking

Protective equipment	Eyeshields, Gloves, type N95 (US), type P1 (EN143) respirator filter
Water hazard class (WGK, DE)	nwg
Hazard codes (EU)	F
Risk statements (R)	11

Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.

04 /Identifiers & registry

CAS number

7440-58-6

MDL number

MFCD00011032

05 /Additional specifications

Resistivity	29.6 μΩ-cm, 0°C

06 /Quality & supply

Documentation

Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.

Supply & logistics

Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.

07 /Frequently asked questions

What is Hafnium used for?

Hafnium (CAS: 7440-58-6) is primarily used in nuclear reactors for control rods due to its neutron absorption properties, and in high-temperature alloys for aerospace applications. It also finds use in the semiconductor industry as a dielectric material.

What is the CAS number and formula for Hafnium?

The CAS number for Hafnium is 7440-58-6 and its chemical formula is Hf.

What grade and purity does Tech Serve Solutions supply?

Tech Serve Solutions supplies Hafnium with a purity of ≥99.9% on a trace metals basis, excluding approximately 2% zirconium. This is a technical/research grade; TSS does not represent it as USP, BP, or EP grade.

How is Hafnium supplied and handled?

Hafnium is supplied in forms such as turnings and crystal bar. It is flammable (H228) and requires careful handling. Personal protective equipment includes eyeshields, gloves, and a type N95 (US) or type P1 (EN143) respirator filter. Store away from ignition sources (P210).