L(+)- tartaric acid is a common retarder prolonging the setting time of cement based materials effectively. 

Features 

 ·High purity，stable quality 

 ·Effective retardation for mortars such as cement based mortar 

Applications 

 > Cement based self levelling mortar 

 > Cementitious grout 

 Recommended dosage 

 0.03 - 0.15 % of the total weight of solid powder，and the optimal dosage need to be ascertained according to specific requirements.