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3M™ Glass Bubbles K25

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  • Decreases density and increases buoyancy to help improve efficiency and may lower material costs
  • Provides excellent water and oil resistance for use in underwater applications
  • Stable voids for low thermal conductivity and reduced dielectric constant
  • Versatile use – adaptable to a variety of production processes
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3M™ Glass Bubbles K25 glass bubbles have a density of 0.25 g/cc and an isostatic crush strength of 750 psi. These general purpose spheres have a good strength-to-density ratio and are designed for use in a variety of intermediate depth (e.g up to 5,000 feet of sea water) buoyancy applications, such as drill riser buoyancy modules.

What are 3M™ Glass Bubbles?
The general purpose K Series glass bubbles are the most versatile and economical 3M™ Glass Bubbles. Our 3M™ Glass Bubbles K25 are engineered hollow glass spheres made from water-resistant and chemically-stable soda-lime borosilicate glass. Like all 3M glass bubbles, our K25 glass bubbles are water and oil resistant, providing better utility in underwater applications and creating more stable emulsion explosives. Additionally, they are non-combustible and non-porous, so they do not absorb resin; and their low alkalinity makes this product compatible with most resins while providing a stable viscosity and a long shelf life.

3M glass bubbles are a superior alternative to many conventional fillers and additives such as silicas, calcium carbonate, talc, clay and other materials used in demanding applications. Our low-density spheres are used in a wide range of industries to reduce part weight, may lower costs and enhance product properties – making them more reliable and affordable than many alternatives such as cenospheres and perlite.

Strength-to-Weight Ratio
The benefits don’t end there; although these hollow spheres have thin walls, they have an isostatic crush strength of 750 psi, making them suitable for a number of buoyancy applications, including additives in buoys and shallow water buoyancy applications (e.g. up to 5,000 feet of sea water). K25 bubbles have a fractional survival rate of 80% or more, at 750 psi for consistent performance in highly filled resin systems.

The unique spherical shape of these bubbles offers a number of additional benefits, including: higher filler loading, lower viscosity/improved flow and reduced shrinkage and warpage. Higher filler loading offers the potential for lower costs. Adding to this product’s versatility is its ability to be easily blend

  • Decreases density and increases buoyancy to help improve efficiency and may lower material costs
  • Provides excellent water and oil resistance for use in underwater applications
  • Stable voids for low thermal conductivity and reduced dielectric constant
  • Versatile use – adaptable to a variety of production processes
  • Low density, chemically stable bubbles are ideal additives for buoyancy applications
Specifications
Applications
Bouyancy
Brand
3M™
Capabilities
Chemical Resistance, Lightweighting, Temperature Resistance
Color (unaided eye)
White, powdery
Composition
Soda-lime-borosilicate glass
Density (g/cc)
0.25
Industries
Construction, Insulation and Buoyancy, Mining, Paints and Coatings, Rubber and Plastic, Transportation
Net Weight (Imperial)
1 lb., 10 lb., 18000 lb., 385.809 lb., 400 lb., 410 lb., 80 lb.
Net Weight (Metric)
175 kg, 181.437 kg, 36.287 kg, 8164.663 kg
Particle Size (D50 Micron)
55
Particle Size Range (D50 Micron)
50 - 59, 50 - 59
Product Color
White
Shape
Hollow spheres with thin walls
Sizes Available
Drum (385 lb, 175 kg)
Strength (MPa)
5.1
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