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3M™ Glass Bubbles K15

3M Product Number K15
  • Decreases density and increases buoyancy 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
Net Weight (Imperial)
Net Weight (Metric)
Products Available
Available options:
 Net Weight (Imperial) and Net Weight (Metric)
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Typical Properties
Attribute Name
Chemical Resistance, Lightweighting, Temperature Resistance
Color (unaided eye)
White, powdery
Soda-lime-borosilicate glass
Crush Strength
Density (g/cc)
Construction, Mining, Paints and Coatings, Rubber and Plastic, Transportation
Median Particle Diameter
Net Weight (Imperial)
0.5 lb, 10 lb, 250 lb, 260 lb, 50 lb, 9500 lb
Net Weight (Metric)
0.2 kg, 113 kg, 113.398 kg, 117.934 kg, 23 kg, 4.536 kg, 4309.128 kg
Product Color
Strength (MPa)
  • Decreases density and increases buoyancy 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 emulsion explosives

3M™ Glass Bubbles K15 are hollow glass spheres with a typical density of 0.15 g/cc and isostatic crush strength of 300 psi. These spheres are designed for use in a variety of oil and gas applications including drill riser buoyancy modules, buoys and moorings. Our K15 bubbles produce strong, stable voids with low thermal conductivity, helping coatings achieve the necessary compressive strength.

What are 3M™ Glass Bubbles?
The general purpose K series glass bubbles are among the most versatile and economical 3M™ Glass Bubbles. Our 3M™ Glass Bubbles K15 are engineered hollow glass spheres made from water-resistant and chemically-stable soda-lime borosilicate glass. Like all 3M glass bubbles, our K15 glass bubbles are water and oil resistant, providing better utility in underwater oil and gas applications. 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, lower costs and enhance product properties — making them more reliable and affordable.

Learn more about 3M™ Glass Bubbles (PDF, 1.2 Mb)

Strength-to-Weight Ratio
The benefits don't end there; although these hollow spheres have thin walls, they have an isostatic crush strength of 300 psi, making them suitable for a number of buoyancy applications, including additives in buoys and moorings. At 300 psi, K15 bubbles have a targeted fractional survival rate of 90% for consistent performance.

The unique spherical shape of these bubbles offers a number of important 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 blended into compounds, making it adaptable to a variety of production processes including spraying, casting and molding.

Buoyancy Benefits and Applications
The ideal combination of high strength and low density has made 3M glass bubbles an industry-standard additive for syntactic foams used in buoyancy modules, buoys or buoyancy blocks for undersea vehicles. When 3M glass bubbles are formulated with resin, the resulting syntactic foam has a high strength-to-density ratio to provide maximum net buoyancy for a given depth rating. The bubbles also produce stable voids, which results in low thermal conductivity and low dielectric constant.

Drill Riser Buoyancy Modules
3M glass bubbles K15 (PDF, 82.47 Kb) can be used in a variety of applications. One common application is in drill riser buoyancy modules. Drill riser buoyancy modules are large clamp-on structures that are used on steel risers for all offshore oil and gas drilling. The drill riser is used to offset the weight in water of the riser and all of its associated components. The deep riser buoyancy modules remain stable in high pressure deep water. 3M glass bubbles K15 help to decrease weight of the whole composite structure, allowing it to remain strong, buoyant and lightweight.

Typical Applications

  • Bowling balls
  • Paints and coatings
  • Drill riser buoyancy modules
  • Cast polyester
  • Caulk
  • Explosives
  • Polyester putty
  • Sealants
  • Adhesives
  • Potting compounds
  • Tooling boards
  • Spackling compound

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  • 3M™ Glass Bubbles are intended for industrial applications and manufactured to industrial specifications in conformance with various recognized industrial quality standards. These products are not intended, designed, manufactured or labeled for sale to or use by consumers, or for medical device, food/food supplement/food additive, drug, or cosmetics applications. 3M Advanced Materials Division (3M) will assess the intended use of 3M™ Glass Bubbles and reserves the right not to sample, sell or supply if 3M determines that it is not in a position to support the intended use of 3M™ Glass Bubbles.

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