Low Sulphur Pulverised Fuel Ash, PFA, is a very fine dark grey powder which acts as a pozzolan but additionally darkens the colour of a mortar. Please talk to us regarding addition rates as it varies by application. PFA is sold in 20kg Bags.
Trass is a natural pozzolan that has seen widespread use throughout northern Europe for hundreds of years, creamy beige in colour it’s a well-known Pozzolan derived from volcanic tuffs sourced from the Rhine Valley in Germany. Similar to the volcanic pumices and tuffs from Pozzuoli, the material established by the Romans. Due to it's weight, Trass cannot be shipped via a parcel carrier such as APC. Please do not select this option at checkout.