Red crushed brick dust is typically a very weak pozzolan, however it does act as a porous particulate. Brick Dust is also used as a colourant for mortars.

A general-purpose bentonite clay powder with good thickening characteristics.

Off white chalk dust, crushed and screened to contain 99.9% under 300 micron. This is a dull white dust which can be used in various conservation applications. The colour and grading is consistent and reliable.

Trass is a pozzolan that can be added to mortars to reduce capillarity without impacting too much on vapour permeability.