Water-insoluble soda-lime-borosilicate glass bubbles engineered to reduce composite weight, lower thermal conductivity, control resin demand and survive selected processing conditions.
Choose the lowest-density grade that can tolerate the pressure and shear generated during mixing, pumping, extrusion, moulding or final service.
Lower true density provides greater weight reduction, but the selected grade must also survive processing and service loads.
Use higher-strength grades for aggressive mixing, thermoplastic extrusion, injection moulding or pressure-loaded syntactic systems.
Particle size influences surface finish, packing, viscosity response and suitability for thin sections or fine features.
Lowest-density grade in the published range for thermal-insulation plasters, low-stress caulks and lightweight coatings.
General-purpose low-density filler for resin systems, automotive body putties, lightweight caulks and pourable polyurethane compounds.
Surface-treated grade positioned for improved wet-out, dispersion and interfacial adhesion in organic resin systems.
Medium-pressure grade for dry-mix construction mortars, sheet-moulding compounds and structural adhesives.
Lightweight high-strength grade for self-levelling epoxy screeds, elastomeric roof coatings and tile grouts.
High-strength grade developed for demanding thermoplastic processing, injection moulding and deepwater insulation syntactics.
Low-density 3,000 psi grade positioned for automotive lightweighting, structural sealants and aerospace components.
The spherical, hollow glass structure affects formulation weight, flow, resin demand, thermal performance and dimensional response.
Low-density glass bubbles displace heavier resin or conventional mineral filler to reduce finished composite weight.
Smooth spherical surfaces have lower surface area than irregular fillers, supporting efficient resin wet-out.
The spherical shape provides a ball-bearing effect that can improve flow in suitable liquid formulations.
The hollow structure supports lower thermal conductivity in insulation coatings, syntactics and composite systems.
Isotropic spheres avoid directional fibre orientation and support uniform dimensional behaviour.
The portfolio spans low-pressure lightweighting through 16,000 psi high-pressure processing grades.
Published application areas for 3M™ Glass Bubbles.
Subsea insulation, syntactic risers, low-density drilling fluids and cryogenic tanks.
Injection moulding, thermoplastic extrusion, synthetic foams and resin reduction.
SMC/BMC panels, sealants, underbody coatings and EV battery potting.
Aerospace syntactics, marine composites, commercial vehicles and rail interiors.
Reflective roof coatings, spackling, joint fillers, plasters and concrete.
Low-dielectric potting, 5G housings, radar-transparent enclosures and encapsulation.
Epoxy flooring screeds, cultured marble, decorative panels and maintenance products.
Prosthetic composites, orthotic compounds, medical housings and dental syntactics.
Emulsion-explosive sensitisation, mitigation foams and thermal protective insulation.
Published values from the supplied category page.
| Grade | Target True Density | Isostatic Crush Strength | Particle Size D50 | Published Positioning |
|---|---|---|---|---|
| K1 | 0.125 g/cm³ | 250 psi (1.7 MPa) | 65 µm | Ultra-lightweight density reduction |
| K15 | 0.15 g/cm³ | 300 psi (2.1 MPa) | 60 µm | General pourable resin filler |
| K15 HSN | 0.15 g/cm³ | 300 psi (2.1 MPa) | 60 µm | High-nitrogen silane surface treated |
| K37 | 0.37 g/cm³ | 3,000 psi (20.7 MPa) | 45 µm | Medium-pressure SMC/BMC and mortars |
| S28HS | 0.28 g/cm³ | 3,000 psi (20.7 MPa) | 30 µm | High strength-to-density for flooring |
| iM16K | 0.46 g/cm³ | 16,000 psi (110 MPa) | 20 µm | High-pressure moulding and deepsea applications |
| XLD 3000 | 0.23 g/cm³ | 3,000 psi (20.7 MPa) | 30 µm | Extra-low density for automotive and aerospace |
Values are typical or target values. Confirm the current 3M technical data sheet, processing limits and availability before specification.
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