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Thin gold coating (about 20nm) is applied to solid barium titanate glass microspheres 30-100um, achieving slightly conductive high density glass particles. Microspheres are supplied as a dry dark brown powder.
Bulk grades of barium titanate solid glass microspheres are also available, as well as barium titanate microspheres with retroreflective aluminum coatings:
Barium Titanate Glass Microspheres.
Alternative options for conductive spherical particles:
Conductive Microspheres and Particles.
Material Safety Data Sheet - Gold-Coated Solid Glass Microspheres
Conductive Silver-Coated Soda Lime Solid Glass Microspheres - 1um to 180um
Aluminum-Coated Solid Barium Titanate Glass Microspheres 4.2g/cc - 30-100um
Barium Titanate Solid Glass Microspheres 4.1-4.4g/cc - 5um to 1000um (1mm)
Retroreflective Aluminum-Coated Solid Barium Titanate Glass Microspheres ~4.5g/cc - 30-100um