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Standard Type : Main
Document No : ISO 7805-2:1987
Document Year : 1987
Pages : 5
Edition : 1
Section Volume : Test sieves, sieving and industrial screens (ISO/TC 24/SC 8.)
Describes three patterns using round (circular) and square perforations. The sizes of holes range down to 2 mm for square holes and to 0.5 mm for round holes. Five ratios of pitch to hole are specified which result in nominal open areas ranging from about 60 % to 23 %.