IS 5536 : 1969 Specification for constant flow type air-permeability apparatus (Lea and Nurse type)

1 Scope

1.1 This standard covers the requirements of air-permeabilityapparatus (Lea and Nurse Type) for measuring the specific surfaceof powdery materials expressed as total surface area in squarecentimetre per gram of material.

1.1.1 The method of determination of specific surface using theabove apparatus is also covered in this standard.

2 References

IS 2 :1960      Rules for rounding offnumerical values

IS 4031 : 1968   Methods of physical tests forhydraulic cement