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3M™ Glass Bubbles K25

Glass Bubbles
Glass Bubbles
3M(TM) Glass Bubbles K25
3M™ Glass Bubbles K25 have a density of 0.25 g/cc and an isostatic crush strength of 750 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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Low density (0.25 g/cc) and high isostatic strength make 3M glass bubbles K25 ideal additives for shallow water buoyancy applications or processing applications where high strength is needed. In addition, like all 3M glass bubbles, K25 bubbles are compatible with thermoset resins like polyurethane and epoxy, and are virtually insoluble in water.

Typical Properties

CapabilitiesLightweighting, Temperature Resistance, Chemical Resistance
Color (unaided eye)White, powdery
CompositionSoda-lime-borosilicate glass
Crush Strength (PSI)750
Density (g/cc)0.25
IndustriesMining, Paints and Coatings, Insulation and Buoyancy, Transportation
Particle Size (D50 Micron)55
Particle Size Range (D50 Micron)50 - 59
ShapeHollow spheres with thin walls
Sizes AvailableSmall Box Special (80 lb, 36.2 kg), Drum (385 lb, 175 kg), Bulk Trailer, Small Box (10 lb, 4.5 kg), Large Box (410 lb, 186 kg), 1 Gallon Container (1 lb, 0.4 kg), Small Box (80 lb, 36.2 kg), Supersack (400 lb)
Strength (MPa)5.1