The coefficient of static friction was obtained with
respect to six surfaces: for plywood, galvanized iron, stainless
steel, polypropylene (PP) knitted bag, polyvinyl chloride
(PVC) and cast polypropylene (CPP) surfaces. These
are common materials used for transportation, storage
and handling operations of grains, pulses and seeds construction
of storage and drying bins. A hollow metal cylinder
50 mm diameter and 50 mm high and open at both ends
was filled with the seeds at the desired moisture content and
placed on an adjustable tilting table that made from wood.