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Hollow glass microspheres are coated with silver metal to create highly electrically conductive surface to be used as a filler that is lighter than solid silver in paints, adhesives, and composites to provide electrical conductivity. Loadings as low as 20% by weight can achieve sufficient shielding against electromagnetic interference (EMI).
Other Sliver-Coated Conductive Particles: Conductive Silver Metal Coated Microspheres.
Conductive hollow glass microspheres have low particle densities and so provide a significant weight reduction when used in place of conventional conductive fillers such as solid silver particles. A range of products offers particles with a variety of diameters, densities and crush strengths. HGMS-AG product line was specifically designed for applications in biotechnology and particle image velocimentry which often require a true particle density higher than 1g/cm3 or just slightly lower at 0.9g/cm3.
Light grey powder.
All of these products gave shielding of 45-55 dB at 3 GHz when incorporated at 40% by volume into an acrylic resin film of 50-100 μm thickness.
M-18 conductive spheres gave shielding of 45dB at only 20% loading.
Material Safety Data Sheet – Silver Coated Hollow Glass Microspheres
Optical valves for lab-on-a-chip applications
Formation of printable granular and colloidal chains through capillary effects and dielectrophoresis
Conductive Silver-Coated Monodisperse Silica Microspheres 2.3g/cc to 4.1g/cc, CV<10% - 2um to 9um
Stainless Steel (Non-Magnetic) Microspheres 7.8g/cc - 1um to 1200um (1.2mm)
Conductive Silver-Coated Poly(Methyl Methacrylate) PMMA Microspheres 1.2g/cc-2.3g/cc - 5um to 700um (0.7mm)
Hollow Glass Microspheres 0.1g/cc to 0.7g/cc - 5um to 90um