Leca is an aggregate made of expanded clay which is produced in rotary kiln at the temperature of about 1200 degree centigrade. Recently, these aggregates are manufactured and presented in over 20 countries with various marketing names. Leca co. Iran, the  only , Leca  light  weight  aggregate and light weight concrete block  producer  in  the  region  and  winner  of  technical  certificate  for manufacturing Leca blocks being in conformity with universal and  Iran  national  standards , brings you safety  and  economical  advantages.  Leca  aggregates are  round in  shape  and   rough  and disagreeable texture surface .It has a  microscopic surface with  fine  porous. It is  brown  and   its inside is black with cellular structure.