Aluminosilicate microspheres (cenospheres, light fraction of fly ash, bottom ash microspheres, microspheres of energy ashes) are hollow pellets ranging from 20–50 to 400–500 microns in size (most commonly 100–250 microns) with an extensive area of application.
Aluminosilicate microspheres (cenospheres, light fraction of fly ash, bottom ash microspheres, microspheres of energy ashes) are hollow pellets ranging from 20–50 to 400–500 microns in size (most commonly 100–250 microns) with an extensive area of application. Microspheres are used in the refractory, oil & gas, chemical, and construction industries.
Microspheres are characterised by low density, high mechanical strength, chemical inertness, heat resistance, and low thermal conductivity. This means that microspheres can be used as thermal insulation materials and fillers for composite materials and special types of cement. Microspheres also are a promising raw material for obtaining catalysts, adsorbents, and encapsulating materials that can function in aggressive environments and high temperatures.
The product’s quality has been certified by the company’s laboratory and by an ISO 9001 International Quality Management Certificate (2009). Microspheres are safe for further use as per Regulation (EC) No. 1907/2006 (REACH).
Microspheres are small spherical particles, with diameters in the micrometer range (typically 1 μm to 1000 μm (1 mm)). Microspheres are sometimes referred to as microparticles.
Microspheres can be manufactured from various natural and synthetic materials. Glass microspheres, polymer microspheres and ceramic microspheres are commercially available. Solid and hollow microspheres vary widely in density and, therefore, are used for different applications. Hollow microspheres are typically used as additives to lower the density of a material. Solid microspheres have numerous applications depending on what material they are constructed of and what size they are.
Polyethylene, polystyrene and expandable microspheres are the most common types of polymer microspheres.
Polystyrene microspheres are typically used in biomedical applications due to their ability to facilitate procedures such as cell sorting and immunio precipitation. Proteins and ligands adsorbonto polystyrene readily and permanently, which makes polystyrene microspheres suitable for medical research and biological laboratory experiments.
Polyethylene microspheres are commonly used as a permanent or temporary filler. Lower melting temperature enables polyethylene microspheres to create porous structures in ceramics and other materials. High sphericity of polyethylene microspheres, as well as availability of colored and fluorescent microspheres, makes them highly desirable for flow visualization and fluid flow analysis, microscopy techniques, health sciences, process troubleshooting and numerous research applications. Charged polyethylene microspheres are also used in electronic paper digital displays.
Expandable microspheres are polymer microspheres that are used as a blowing agent in e.g. puff ink, automotive underbody coatings and injection molding of thermoplastics. They can also be used as a lightweight filler in e.g. cultured marble, waterborne paints and crack fillers/joint compound. Expandable polymer microspheres can expand to more than 50 times their original size when heat is applied to them. The exterior wall of each sphere is a thermoplastic shell that encapsulates a low boiling point hydrocarbon. When heated, this outside shell softens and expands as the hydrocarbon exerts a pressure on the internal shell wall.
Glass microspheres are primarily used as a filler and volumizer for weight reduction, retro-reflector for highway safety, additive for cosmetics and adhesives, with limited applications in medical technology. Microspheres made from highly transparent glass can perform as very high quality optical microcavities or optical microresonators.
Ceramic microspheres are used primarily as grinding media.
Hollow microspheres loaded with drug in their outer polymer shell were prepared by a novel emulsion solvent diffusion method and spray drying technique.
Microspheres vary widely in quality, sphericity, uniformity, particle size and particle size distribution. The appropriate microsphere needs to be chosen for each unique application.
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