POWER OF CONCRETE HARDENER (SILVER) It is now possible to dispatch solid blocks / Bricks in just 24 hours of time with great strength AND also to demould pavers / tiles in just 9 hours of time by using - BEST HARDENER - (ISO 9001-2015 CERTIFIED COMPANY) Super strong binding Most Economical hardener 100% Guaranteed Results Self curing ability Increase in Strength by 25-30%