The test sieves conform to the Indian Standards, and satisfy requirements of IS : 460 (Part-I) 1978 for the wire cloth test sieves and IS : 460 (part II) 1978 for perforated plate test sieves with respect to widths of aperture, permissible variations in aperture, wire diameter and screening areas.
The sieves from 22 micron to 3..35 mm size are available in 200 mm and have woven wire cloth fixed in spun brass frames, from 40 mm to 53 mm size are available in 300 mm size and from 63 mm to 125 mm size in 450 mm diameter.
The sieves of size 5.6 mm and above in 300 mm or 450 mm dia. are either of woven wire or perforated sheet and are fitted in G.I. Frames as per the requirement.