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Whisker products

Capitalizing on its long-cultivated crystal growth and sintering control technologies, Tateho Chemical Industries Co., Ltd. successfully commercialized silicon carbide whiskers and silicon nitride whiskers from 1981 to 1982.
Although the mass production of whiskers had been deemed difficult, Tateho achieved it, with its unique technology.
Whiskers are low-defect, fine, short-fiber crystals and have extremely high-strength.
For this reason, whiskers have high strength, high elasticity, and high hardness and excel in heat and corrosion resistance, being used as reinforcing material for composite materials of ceramics, metals, and plastics.

Whisker products

Tateho offers Silar® products, silicon carbide whiskers manufactured by Advanced Composite Materials, LLC.

Scanning Electron Microscope photograph of silicon carbide whisker

※ Silar® is a registered trademark of Advanced Composite Materials, LLC.
※ Tateho Chemical Industries Co., Ltd. is the sole agent for Silar® products in Japan.

Features and usages

Features Usages
  • When used as reinforcing material for composite materials, SilarR products, characterized by their high aspect ratios, improve mechanical properties of composite materials.
  • Silar® products are chemically stable and excel in thermal conductivity.
  • Being insoluble, Silar® products can be used with fluoropolymer and ceramics in direct contact with foods.
  • Dispersible in water, Silar® products can be used with fluoropolymer emulsion.
  • Silar® products are characterized by very high permittivity and loss tangent
  • Reinforcing material for cutting-tool-use hard ceramics(for turbines and jet engines)
  • Reinforcing material for wear-resistant-use hard ceramics(wear resistance superior to that of hardened steel)
  • Reinforcing material for microwavable-ceramics(for cooking and industrial heating)
  • Reinforcing material for plastics

Typical Properties

Chemical formula SiC
Crystal Structure  Beta (Polytype)
Diameter (10-6m) 0.45 ~ 0.65
Length (10-6m) 5 ~ 80
Density (103kg・m-3) 3.2
Free carbon (%) 0.05 ~ 0.30
Silica (%) 0.35 ~ 0.75

※The properties are the typical values and not guaranteed values.

The Application

The Silar® Microwave Grill, an innovative ceramic composite microwave heatable oven insert, revolutionizes microwave cooking. Silar® changes the speed-quality cooking paradigm, and provides higher quality foods cooked even faster. In the past, if you wanted food cooked and prepared quickly, you had to compromise on quality.
Silar’s new microwave-conduction cooking allows food to cook both on top and on the underside evenly and uniformly. The Silar Microwave Grill rises to cooking temperatures in as little as five seconds, and can reduce cook times by up to 90%.

silicon nitride whisker

Scanning Electron Microscope photograph of silicon nitride whisker

Silicon nitride whiskers come from our own product lines.

Features and usages

Features Usages
  • High strength, high hardness, excellent heat resistance
  • Chemically stable, excellent electric insulation
  • Thermal expansion half that of silicon carbide whiskers.
  • Resistant to wetting by molten metal (such as aluminum); heat-insulating
  • Reinforcing material for metal and plastics composite materials
  • Strengthening material for insulating materials
  • Shielding materials

Typical Properties

Chemical formula Si3N4
Crystal Structure  Alpha
Diameter (10-6m) 0.1 ~ 1.6
Length (10-6m) 5 ~ 200
Density (103kg・m-3) 3.18
Mg (%) 0.2 (Max)
Ca (%) 0.5 (Max)
Al (%) 0.2 (Max)
Fe(%) 0.1 (Max)

※The properties are the typical values and not guaranteed values.



Tateho Chemical Industries Co.,Ltd.

  • Paid-up Capital : JPY 450 Million
  • Number of Employees : Approx.270
  • Establishment : 1966

Received ISO9000, 14000

"Tateho's vision of creating new environment-friendly materials"

Tateho Chemical Industries Co., Ltd. was born in the town of Ako--an area blessed with a warm climate and the abundant marine resources of the Inland Sea of Japan.
The history of the salt industry in Ako is long--dating back nearly 1300 years to the Nara period.
In 1966, Tateho was established as a group of engineers seeking to provide new materials widely useful for society by putting this inherited, time-honored wisdom into full use, and by effectively utilizing bittern, a substance left after separating salt from seawater.
Since then, we have continued to provide the world with highly functional products--including magnesium oxide, magnesium hydroxide, electrofused magnesium oxide, single crystal magnesium oxide, flame retardants, and ceramics--by expanding our businesses on the basis of our proprietary crystallization control technology.
We are committed to contributing to industry worldwide under the slogan of "Aiming to be a development-oriented company friendly to the natural environment and leading the world with proprietary technologies" by continuously adhering to our environmental policy and further improving our proprietary technologies.