Hollow Glass Microspheres for UAV Resin Weight Reduction
True sphere hollow glass microspheres (HGM) for weight reduction in epoxy resin systems used in drone foam-core sandwich panels, fairing compounds, tooling boards, and syntactic foam buoyancy/flotation structures.
Key Features
- ✓30–40% density reduction in epoxy resin at 30–40 vol% loading — significant weight savings in drone fairing compounds
- ✓Three grades (D15/250 / D28/110 / D60/110) cover pressure ranges from low-pressure infusion to autoclave processing
- ✓Silane surface treatment prevents interface debonding in -40°C to +120°C drone thermal cycling
- ✓True sphere morphology minimizes viscosity increase vs angular filler particles at equivalent loading
- ✓Reduces thermal conductivity of cured resin — thermal insulation benefit for battery bay fairing compounds
- ✓Improves machinability of cured epoxy tooling compounds — reduced cutting forces vs glass bead-filled systems
Specifications
| Parameter | Value |
|---|---|
| Oil absorption | 0.2–0.4 mL/g |
| Water absorption | <0.1 wt% |
| Surface treatment | Aminosilane or epoxy-silane coupling agent |
| Thermal stability | To 300°C |
| Particle size (D50) | 30–80 μm |
| Chemical composition | Borosilicate glass |
| Grade D15/250 density | 0.15 g/cm³ / Crush strength 28 MPa |
| Grade D28/110 density | 0.28 g/cm³ / Crush strength 110 MPa |
| Grade D60/110 density | 0.60 g/cm³ / Crush strength 110 MPa |
| True sphere morphology | Yes (>95% spherical particles) |
FAQ
Grade selection is primarily driven by the processing pressure and the required weight reduction. D15/250 (crush strength 28 MPa) is for hand mix and low-pressure applications — fairing fill compounds, surface smoothing paste, and low-pressure resin infusion (<1 bar). D28/110 and D60/110 (both crush strength 110 MPa) withstand resin infusion at up to 6 bar and standard autoclave pressures. Choose D28 for maximum weight reduction (it's lighter), and D60 when you need marginally higher strength at slightly higher density. For spray application via airless spray, use D28 or D60 (D15 may crush at nozzle tip pressure). Always mix HGM into the B-component (hardener/curing agent) first, then add to A (resin), to avoid premature microsphere crushing during high-viscosity mixing.