3M™ Glass Bubbles
S38HS
High-strength hollow glass microspheres designed for buoyancy and insulation in ultra-deep-water applications, producing strong stable voids with low thermal conductivity.
More volume. Less mass.
S38HS combines 0.38 g/cc true density with 5,500 psi crush strength at 80% survival, supporting buoyancy, insulation and demanding polymer systems exposed to processing and hydrostatic pressure.
ULTRA-DEEP WATER
Designed for buoyancy and insulation applications in oil and gas drilling.
STABLE VOIDS
High strength helps preserve low-density closed-cell volume under pressure.
THERMAL CONTROL
Low thermal conductivity supports insulation-oriented polymer composites.
MARINE COMPOSITES
Applicable to syntactic urethane, silicone, polypropylene and suitable thermoset systems.
Built for lightweight systems
Representative syntactic-foam and FRP marine applications. Final suitability depends on resin chemistry, filler loading, process pressure and end-use qualification.
SYNTACTIC FOAM
Strong, stable voids and low thermal conductivity for suitable subsea buoyancy and insulation systems.
FRP & MARINE COMPOSITES
Lightweighting potential in thermoset and marine composite structures after complete process validation.
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 S38HS |
|---|---|
| Shape | Hollow spheres with thin walls |
| Composition | Soda-lime borosilicate glass |
| Colour / appearance | Off-white, powdery |
| Crush strength, 80% survival by volume | 5,500 psi |
| True density | 0.38 g/cc |
| Packing factor | 60% |
| pH at 5 wt% loading in water | 9.5 |
| Average diameter | 44 µm |
| Softening point | 600°C |
| Flotation, density below 1.0 g/cc | 96% |
| Volatile content by weight | 0.5% |
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