Cement spacer specification: 1.High compressive strength above 50N/mm2 2.No deformation with temperature fluctuations 3.Excellent physical and chemical resistance 4.Low permeability 5.Excellent bond with concrete 6. No hairline cracks between the spacer and concrete Material of Cement Spacer Maker: Fly ash,construction waste,sand,.crushed stone, cinder,clay.cement,can be used as raw materials of making baking-free brick. Producing baking-free bricks is a ideal way of eliminating the environmental pollution,saving the land resources, comprehensive utilizing the industrial residue and building up family fortunes