Mechanical stabilization reduces the bulk mobility of the waste and makes it durable and dimensionally stable. The final product should be capable of resisting deterioration caused by mechanical or environmental stresses. The extent of mechanical stabilization is evaluated by conducting strength and durability tests. Immobilization by fixation minimizes the local mobility of individual contaminant, components. Leaching tests are conducted to determine the effectiveness of fixation. Immobilization by isolation limits the of the contaminants reaching the boundaries of the deposited mass by providing protection against internal contaminants transport ( avoiding intimal and extemal cracking ) and by restricting internal transport pathways flow permeability).