It is a functional porous glass that allows for arbitrary pore diameters to be specified in the range of 0.1 to 50 μm, characterized by a narrow pore distribution and a high porosity.
In 1981, the Miyazaki Prefectural Industrial Technology Center developed a porous glass called SPG (Shirasu Porous Glass) that utilizes the micro-phase separation of glass made from shirasu (volcanic ash), which is abundantly deposited in southern Kyushu. This glass can be freely designed with uniform continuous pores on the micron order. - It contains countless precisely controlled continuous pores (monolithic structure). - The size of the pores can be designed arbitrarily within a wide range from 0.1 μm to relatively macro-sized pores of 50 μm. - It has a narrow pore distribution. - There is no deformation of the pores under pressure. - It has excellent heat resistance (max 500°C). - Surface chemical modification allows for hydrophilization or hydrophobization of the surface, as well as the introduction of various organic functional groups. - Despite being porous, it has very high mechanical strength and excellent heat resistance and thermal insulation. - It is resistant to most reagents except for strong alkalis and hydrofluoric acid.
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Composition: Aluminosilicate glass Shape: - Pipe shape, outer diameter 10 mm - Pipe shape, outer diameter 5 mm - Disk, circular (outer diameter 5–20 mm) - Disk, square (outer diameter 5–20 mm) - Other special shapes Pore diameter: 0.1–50 microns (varies by shape) When using for SPG emulsification, bubbling, or filtration, please use dedicated devices. For more details, please contact us.
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<SPG Applied Technology> SPG is utilized as functional glass that leverages its unique characteristics. In particular, it is applied as a "dispersion membrane" that disperses liquids and gases, using methods such as "SPG membrane emulsification" and "SPG bubbling," demonstrating distinctive performance that cannot be replicated by other technologies. Notably, the "membrane emulsification method" is a unique technology that allows for the creation of monodisperse emulsions and the adjustment of particle size. As a filter, it takes advantage of its glass material, heat resistance, and pore shape (monolith structure) to be applied in the filtration and classification of substances that cannot be filtered using metal, ceramic porous bodies, or organic filters. Additionally, due to the freedom of surface area by changing the pores, there are research achievements in heat dissipation materials, sensor elements, and catalysts that combine SPG membranes with functional substances. Currently, such SPG applied technologies are being utilized in various fields, including medicine, pharmaceuticals, chemistry, electronics, cosmetics, and food.
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SPG stands for S "Shirasu," P "Porous (Pore)," and G "Glass," and it is a type of porous glass that can be designed arbitrarily within a wide range of pore diameters from 0.1 to 50 μm. It is a unique inorganic porous material with a narrow pore distribution and a high porosity rate. Initially, research and development focused on the application of SPG technology in the medical field. However, various research institutions have published their findings, and it is now applied in a variety of fields including medicine, pharmaceuticals, chemistry, electronics, cosmetics, and food. The representative method of using SPG, known as the "membrane emulsification method," allows for precise control over the size of the desired emulsion by using it as a dispersion membrane, enabling the preparation of uniform monodisperse emulsions. Currently, SPG application technology contributes to the creation of new product values, ranging from disposable devices that prepare several milliliters of pharmaceuticals on-site in medical settings to the manufacturing processes for monodisperse emulsions in factory scales of several tens to hundreds of liters, as well as its use in semiconductor processes.