SPHERON
All applications Polymers and composites

Microspheres for polymers and lightweight composites

Hollow aluminosilicate microspheres can serve as a lightweight mineral filler in resins, fillers and composites. Grade selection should reflect matrix viscosity, required surface finish, colour and mixing conditions.

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Polymer composite with SPHERON aluminosilicate microspheres
Polymers and composites

The role of microspheres in the formulation

The fine 0–150 µm range is a natural starting point for thin layers, finishing compounds and systems requiring a smooth surface. The 0–300 µm range provides a broader particle distribution for trials in thicker compounds.

Grade comparisons should cover volumetric dosing, viscosity after filler addition, wetting, air content and surface quality. Particle behaviour must also be checked at the intended mixing speed and duration.

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Recommended starting products

The final grade must be validated in the target formulation and process. These products provide a practical starting point for trials.

SPH-200E — 63–200 µm
Series E
Aluminosilicate microsphere

SPH-200E — 63–200 µm

A controlled 63–200 µm E-series grade with a concentrated fine-to-medium particle-size distribution for coatings and composites.

Why this grade

The controlled 63–200 µm range and 0.35–0.44 g/cm³ bulk density support composite trials with a defined fine-to-medium grading.

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SPH-150E — 0–150 µm
Series E
Aluminosilicate microsphere

SPH-150E — 0–150 µm

A fine 0–150 µm E-series grade for formulations where a smaller maximum particle size is required.

Why this grade

The 0–150 µm range and 0.36–0.44 g/cm³ bulk density provide a starting point for thin compounds with a grey colour profile.

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SPH-300A — 0–300 µm
Series A
Aluminosilicate microsphere

SPH-300A — 0–300 µm

A versatile 0–300 µm A-series grade with a white to light grey color profile.

Why this grade

The 0–300 µm range and 0.36–0.42 g/cm³ bulk density allow a broader grading to be assessed in thicker composite compounds.

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SPH-150A — 0–150 µm
Series A
Aluminosilicate microsphere

SPH-150A — 0–150 µm

A fine 0–150 µm A-series grade for formulations requiring a smaller maximum particle size and lighter color.

Why this grade

The fine 0–150 µm range, light colour and 0.36–0.44 g/cm³ bulk density suit trials in smooth, light-coloured composites.

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