Class 6 (Crusher Dust/Fines)
Class 6 fill is a crusher dust type material. It shall be good, hard rock screened and crushed to lie within the grading envelope shown below and free from natural sand, silt, clay and any other deleterious material. Class 6 fill shall also be non-plastic when tested and shall not be susceptible to breakdown under moist conditions.
The total sulphate content as SO3 of the material shall not exceed 1%and the total soluble salts shall not exceed 2%.