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Porous metal Celmet™

The porous metal Celmet™, which has been favorably used in various applications and is asked about by many customers, even 40 years since its release.

Product data

What is the porous metal Celmet™?

Celmet™ is a porous metal material whose framework has a three-dimensional sponge-like mesh structure. Its maximum porosity of 98% is far higher than that of sintered metal materials produced from metal powder or metal fiber, helping realizing lower airflow resistance and thus handling fluids at low pressure drop. Other Celmet™ advantages include large surface area per unit volume (specific surface area), and excellent thermal and electrical conductivity. It is also distinguished by good workability and can be easily punched, pressed and piped. Today Sumitomo Electric Toyama Co., Ltd. mass produces nickel Celmet™ and nickel chrome Celmet™ products, and is committed to developing new Celmet™ products using aluminum and various alloys in cooperation with R&D laboratories, aiming to enrich Celmet™ product varieties.

Where is the porous metal material Celmet™ used?

Shortly after its release, Celmet™ was used for major applications such as air-heating equipment, for its excellent and highly valued thermal and electrical conductivity; and loudspeakers, for its effective high rigidity and surface density for the vibrating plates. Ever since then, Celmet™’s excellent characteristics have favored its use in a wide variety of industrial applications, including nickel hydride battery electrodes, its biggest application; kitchen grease filters; industrial deodorizing catalyst carriers; and silencers for reducing engine noise and wind noise.

Interview with engineer in charge
Kengo Tsukamoto
Toshitaka Nakagawa
Electronic Materials Engineering Section,Sumitomo Electric Toyama Co.,Ltd.
Kengo Tsukamoto Toshitaka Nakagawa

In what respects is it difficult to produce Celmet™?

To produce Celmet™, porous urethane resin, based on which the porous framework is produced, is processed to be electrically conductive. It is then metal-plated. The porous resin and conductive coating layer are subsequently removed and metal ions are reduced into the metal deposit layer. One of the difficulties in producing Celmet™ is to stably feed urethane sheet, which is used as the substrate, in a continuous loop, because the sheet is extremely soft. Another difficulty is to completely remove the resin and conductive coating layer from the metal porous material.

To deal with these difficulties and realize stable production, we are committed to developing stable continuous plating and heat treatment facilities, and creating material technologies related to urethane and conductive processing. Regarding the production of Celmet™ for vehicle-mounted nickel hydride batteries, its biggest application, carrying in of any foreign materials into the production area is strictly prevented to avoid their ingress, and the production facilities are strictly controlled.

What features of our products are favored by customers?

Although about 40 years has passed since its release, we receive many inquiries about Celmet™ from a wide variety of business fields, highly evaluated for its various characteristics, qualities and functions, including air flow, capillary action, fluid retention, electrical conductivity, thermal conductivity, corrosion resistance, heat resistance, and gas diffusion.
To ensure customers continue choosing and adopting Celmet™ for their needs, we are committed to improving its characteristics to satisfying what customers want. We are also committed to in-depth development encompassing Celmet™ processing technologies. We are highly rated for our product development and supply efforts to satisfy customer needs.

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