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3M™ Glass Bubbles K20

Glass Bubbles
Glass Bubbles
3M(TM) Glass Bubbles K20
3M™ Glass Bubbles K20 have a density of 0.2 g/cc and an isostatic crush strength of 500 psi. The general purpose K Series glass bubbles are the most economical 3M glass bubbles.
  • Lower viscosity, improved flow
  • Increased filler loading, reduced cost
  • VOC reduction
  • Chemical stability and inertness
  • Reduced dielectric constant
  • Thermal conductivity reduction
  • Temperature resistance
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3M glass bubbles K20 are used extensively in shallow water buoyancy applications. Their low density (0.20 g/cc) provides reliable buoyancy, and their high isostatic strength makes them an ideal choice when processing or buoy depth requires more strength. And, like all 3M glass bubbles, K20 bubbles are compatible with thermoset resins like polyurethane and epoxy, and are virtually insoluble in water.

Typical Properties

 Capabilities‎‎ Temperature Resistance,‎ Lightweighting,‎ Chemical Resistance
 Color (unaided eye)‎‎ White, powdery
 Composition‎‎ Soda-lime-borosilicate glass
 Crush Strength (PSI)‎‎ 500
 Density (g/cc)‎‎ 0.2
 Industries‎‎ Paints and Coatings,‎ Transportation,‎ Insulation and Buoyancy,‎ Mining
 Particle Size (D50 Micron)‎‎ 55
 Particle Size Range (D50 Micron)‎‎ 50 - 59
 Shape‎‎ Hollow spheres with thin walls
 Sizes Available‎‎ Small Box (60 lb, 27 kg),‎ Bulk Sea Container with Liner,‎ Bulk Trailer,‎ Small Box (10 lb, 4.5 kg),‎ Large Box (335 lb, 151.9 kg),‎ 4 ft Bag (360 lb, 163.2 kg),‎ 1 Gallon Container (0.5 lb, 0.2 kg),‎ Supersack (340 lb, 154 kg)
 Strength (MPa)‎‎ 3.4