Everbuild Opti-Mix Mortar Plasticiser is the world&rsquos first 125 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. Tested to BSEN934-Part 3.