WIRE MESH SIEVES
QAQC Lab wire mesh sieves conform to most international standards, such as ASTM E-11, and ISO 3310. ASTM-E11 standards were developed by the American Society for Testing & Materials, and are very similar to ISO (International Organization for Standardization) Standards, although
more sizes are available in the ISO Standard.
In both standards, sieves are categorized as certified, inspected, or calibrated, depending on the number of apertures tested, in the calibration procedure.
For example, a 4.75 mm aperture sieve, would have 150 openings examined per 100 square feet of sieve cloth. An inspected sieve would require 15 openings per sieve to be measured, and 30 openings per sieve for calibrated.
Certified Test Sieves – Each test sieve is appropriately inspected, individually numbered to provide full traceability and supplied with a Certificate of Compliance to ISO 3310, ASTM E11 or other International specifications.
Inspected Test Sieves – Each sieve
is supplied with an Inspection Certificate stating separately the values for the average aperture in both the warp and weft directions of the wire cloth.
Calibrated Test Sieves – Each sieve is supplied with a Calibration Certificate recording the number of aperture and wire diameters measured, the average aperture size and standard deviation separately for the warp and weft direction. The type of weave will also be stated.
MICROPLATE SIEVES
For precise sieving applications below 20 microns, or where tolerances cannot exceed a few microns, wire mesh sieves cannot be used. Instead, micro-plate, or electro-formed sieves are used.
Other aperture sizes, sieve diameters and sieve depths can be supplied as required. It is recommended that microplate sieves are used in conjunction with a liquid medium to assist the passage of extremely fine particles through the apertures.
In certain cases where this is not possible it is often found that a compatible shaker can speed up the analysis, while maintaining a high degree of accuracy.
PERFORATED PLATE SIEVES
QAQC LAB provides a wide range of perforated plate sieves for the many industries that require them. These are available in diameter sizes of 200, 300, 315, 350, 400 and 450 mm.
Aperture sizes range from 125 mm to 4 mm in square hole and 125 mm to 1 mm in round hole. Perforated plate sieves can be supplied in frame materials of brass or stainless steel. They are manufactured to the highest engineering standards to ensure quality and accuracy.
Perforated plate sieves are available to every national and international standard. Other materials and sizes can be produced to order.
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