Perlite microspheres originate from siliceous volcanic rock.  They expand up to 10 times their original volume when heated – this expansion process is caused by the presence of water in the crude rock.  When the ore is rapidly heated this water vaporizes and causes the softened rock to expand, tiny glass-like bubbles are produced which account for the lightweight and exceptional physical properties of perlite microspheres.  The narrow particle size distribution of these is tightly controlled.


Jointing compounds and spray plasters
Tile adhesives
Cement-based jointing compounds and sealants
Cultured marble

Advantages of Perlite Microspheres

Reduction of shrinkage
Less cracking (thicker coats)
Less sagging
Easy to apply
Reduction in drying time (lower water demand)
Weight reduction
Easy sanding
Whiteness – economical
Resistance to thermal shock for cultured marble

The product range includes

Perlite Microsphere (formerly named Noblite)

Perlite Microspheres
Perlite Microspheres Safety Advisory Document