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Pozzolanic additive – 12.5kg bag, this is 100% "green" as it is a by product of making foamed glass, the leftover clay is then used to make this Pozzolanic additive
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Clay product which acts as a pozzolanic material for adding to putty based mortars to aid setting and turn the mortar mildly hydraulic.
Typical use 10 -15% Pozzolanic of mix by volume
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