Unexpanded microspheres (also called expandable microspheres) are hollow polymer spheres that expand when exposed to heat, acting as an in-situ lightweight blowing agent. They are typically 6–40 micrometers in average diameter, with a density of 900–1,400 kg/m³ before expansion. Upon heating, they expand dramatically to create a cellular structure, reducing product weight and adding functional benefits.

FOMA Microspheres are high-performance unexpanded thermoplastic microspheres. Each microsphere has a thermally activated closed-cell structure, designed for controlled and uniform expansion during processing. This ensures precise foaming, consistent density reduction, and excellent repeatability across applications.

Please Contact Us to learn more about the suitable microsphere grade for your applications.

As an innovative lightweight blowing agent, FOMA Microspheres help manufacturers create lighter and more efficient products, while improving cost-effectiveness and performance in demanding industries.