Products | Microspheres

Microsil 325 – Microsil 325S

Very low density and resistant Microspheres

MICROSIL products are made of inert microspheres obtained by thermal treatment at high temperatures that creates a hard glass crust around a hollow space filled by air. This spherical and multi-cellular structure allows to generate polyfunctional fillers with a very low density.

MICROSIL 325 and its coated version MICROSIL 325S, have been designed to be used in applications requiring a small particle size. MICROSIL 325S is a more suitable product in applications where it is required a lower viscosity or a smaller absorption.


  • Allows an important reduction of the system density.
  • MICROSIL improved the yield in the application of the final product.
  • Improves flow and leveling of coatings and mortars.
  • Reduces shrinking and crack formation.
  • MICROSIL allows reducing binder demand increasing filler concentration. This will decrease cost by volume unit in final product.
  • Reduces heat transmission.
  • It is fire resistant.
  • White colored.
  • Good compressive resistance.
  • High chemical inertia and neutral pH.

Fields of application

  • Synthetic marble and polymeric mortars.
  • Asphalt emulsions.
  • Resin based waterproofing coatings.
  • Friction materials.
  • Textural paints.
  • Putties and mastics.
Microsil 325 – Microsil 325S

To download the data sheet in PDF format click the button below:

Download PDF

If you are interested in receiving more information click here