The Pumice used in the manufacture of this range of building blocks was formed B.C. by volcanic action.

The low density of the material is due to its cellular structure created by air bubbles which formed when the dissolved gasses in the volcanic lava were released during cooling, effectively turning the lava into foam.

This raw material conforming to BS 3797 : 1990 has a class one fire resistance rating and is chemically inert.

Besblock Pumice products are produced to BS 6073 : Part 1 : 1981