Opti-Mix Mortar Plasticiser is the world's first 1:25 plasticiser is just Pure Admix, smells and works like the best traditional Admix. Benefits include: superior plasticising action, controlled dosage, consistent mix design, easy to use, no waste. 1 litre is equivalent to 25 litres of standard product and 250ml is equivalent to 6.25 litres of standard product. Tested to BSEN934-Part 3.