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Rulon Bearings
Vitro Minerals RS 50 Recycled Pyrogenic Silica
Categories: Ceramic; Oxide; Silicon Oxide

Material Notes: Vitro Minerals’ RS-50 Pyrogenic Silica is a 100% recycled synthetic, hydrophilic, fully X-ray amorphous silica, produced via flame hydrolysis. It is a white, submicron-sized powder of high purity and a surface area of 20-50 m2/g. The primary particles, sized between 60 and 300 nm (0.06-0.3 µm), are spherical and form loosely agglomerated micro-clusters up to about 3 µm. RS-50 is effective as a thickening and thixotropic rheology control agent in many polymer systems, such as adhesives, coatings, sealants, printing inks, unsaturated polyesters, cosmetics, etc. It can be used as an active reinforcing filler in elastomers and silicone-elastomers. RS-50 is also effective as a flow aid additive in the production of industrial mineral powders.


  • Unsaturated polyester resins
  • Paints & coatings
  • Adhesives and sealants
  • Silicone rubber
  • Wire & cable
  • Printing inks
  • Plastisols
  • Powder coatings
  • Screen printing
  • Protective coatings
  • Epoxy compounds
  • Rubber compounds

    Information provided by Vitro Minerals.

Available Properties
  • Specific Gravity, ASMT D153
  • Bulk Density, ASTM C110
  • Oil Absorption, ASTM D281
  • Moisture Absorption at Equilibrium, ASMT C566, Free
  • Particle Size
  • Particle Mesh Size, <0.05%
  • pH, AFS 113-87-S, 4% dispersion in water
  • Specific Surface Area, ASTM C1069
  • Hardness, Mohs
  • Softening Point
  • Refractive Index
  • Carbon, C, ASTM D6316
  • Chlorine, Cl, ASTM C1152
  • Loss on Ignition(%), ASMT D7348
  • SiO2, ASTM C114
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