How Shirasu was created

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An unparalleled volcanic product

Shirasu is volcanic ejecta that was created 25,000 years ago by a massive volcanic eruption in southern Japanese archipelago. The magma expelled by the eruption formed a massive pyroclastic flow that was deposited so quickly that the shirasu it contained formed a thick layer in the strata before it could mix with other types of soil.

Unique magma ceramic material

Shirasu is a natural inorganic ceramic material created by magma, which we refer to as “magma ceramic”. Shirasu is also known as “amorphous volcanic glass”, and possesses an amorphous portion ranging from 60% to 80%, giving it unique properties which distinguish it from other volcanic products.

Being highly amorphous, its molecular composition is unstable and activated, and according to the environment, it easily causes a catalytic reaction.. Therefore, it inherently exhibits functions such as deodorization, decomposition, sterilization, and ionization.

Image of Unique magma ceramic material

Porous structure and composition of diverse substances

Shirasu has a porous structure featuring numerous holes in extremely fine particles.
Silicate, which is a major constituent of shirasu, is a major source material used in the manufacturing of dehumidifying agents, and is the source of the superior humidity control function of Shirasu-kabe.
Also, the alumina contained in shirasu has a naturally strong gas absorption function which causes odors and chemical molecules to be absorbed into the cavities of the shirasu particles.
A unique feature of shirasu is its extremely complex structure and composition, which cannot be created artificially. This feature differentiates shirasu from the volcanic products of other regions.

Chart of Conposition of shirasu

Conposition of shirasu

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