標準號：IS 4879-1968
發布日期：1969/2/1 12:00:00
實施日期：1999/12/31 12:00:00
適用范圍：1.1 This standard describes the following methods of sub-division of gross sample down to the required quantity for further analysis for determination of particle size distribution:a) Reduction by halving from over 1 500 to 500 litres,b) Reduction by coning and quartering from 1 000 or less to 25 litres,c) Reduction by turntable type sample divider from over 1 500 to 1 litre,d) Reduction by slotted cone type sample divider from over 1 500 to 1 litre,e) Reduction by large oscillating hopper type sample divider from 100 to 1 litre,f) Reduction by grid type sample divider from 50 litres to 5 millilitres, andg) Reduction by small oscillating hopper type sample divider from 1 litre to 0·2 millilitres.