3M™ Glass Bubbles
K-37
General-purpose, high-strength hollow glass microspheres offering a strong balance of low density and process survivability for demanding industrial formulations.
More volume. Less mass.
K37 combines 0.37 g/cc true density with 3,000 psi crush strength, providing a versatile strength-to-density ratio for high-build coatings, polymer compounds and thermoset systems.
POLYMER COMPOUNDING
Lower compound density with spherical filler geometry; add downstream through a side stuffer or top feeder where appropriate.
HIGH-BUILD COATINGS
Weight reduction, sag resistance and insulation potential in suitable protective and marine coating systems.
ADHESIVES & SEALANTS
Lightweight volume extension in mastics, adhesives and sealants where process survival has been confirmed.
PAINTS & COATINGS
Reduced dry-film density, thermal expansion, noise and vibration in suitable industrial formulations.
Built for lightweight systems
Representative application imagery. Final suitability depends on resin chemistry, processing shear, pressure, loading and end-use requirements.
K37 for lightweight polymer compounds and extrusion processes after process-survival validation.
K37 supports lightweight mastics and sealants where processing and performance are fully validated.
K37 provides a useful strength-to-density balance in suitable thermoset resin composite systems.
K37 for high-build, marine and insulation-oriented protective coatings.
Density and strength
Charts reproduce K37 values from the supplied technical data sheet and compare its strength-to-density position with lighter K-series grades.
True density
Isostatic pressure at stated survival
Protect flow and integrity
Keep unopened cartons dry and temperature-controlled. Avoid high humidity, condensation and unnecessary dust generation.
Store dry
Reseal opened bags immediately and use first-in/first-out inventory practices.
Control dust
Use local exhaust or dust collection and transfer through closed systems where practical.
Use PPE
Use safety glasses with side shields and consult the SDS for exposure controls and respiratory protection.
TYPICAL PROPERTIES
Values below are reproduced from the supplied technical data sheet and are not for specification purposes.
| Property | 3M™ Glass Bubbles K37 |
|---|---|
| Shape | Hollow spheres with thin walls |
| Composition | Soda-lime borosilicate glass |
| Colour / appearance | Off-white, powdery |
| Crush strength, 80% survival by volume | 3,000 psi |
| True density | 0.37 g/cc |
| Packing factor | 60% |
| pH at 5 wt% loading in water | 9.5 |
| Average diameter | 45 µm |
| Softening point | 600°C |
| Flotation, density below 1.0 g/cc | 94% |
| Volatile content by weight | 0.5% |
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