... -1:1990 R20/3,R20,R40/3 seriesWe can supply three kinds of test sieves: test sieves of metal wire cloth ... standard and ISO3310-2:1990 R20/3,R20,R40/3 series GB6003.3-1997 standard and ISO3310-3:1990 R20/3 ... ,R20,R40/3 series SpecificationPattern(mm)Φ75/ Φ100/ Φ127/ Φ200/ Φ203/ Φ300/ Φ400/ Φ600 ...