Haver test sieves are fabricated according to the valid standards: ISO 565, DIN ISO 3310, ASTM E 11, BS 410, AFNOR, NEN 2560, ISO 5223 etc. They are characterised by accuracy and stability. The meticulous fabrication and optimum tension of the sieve bottoms guarantee a good service life with perfect operaion.
Haver test sieves with woven wire cloth are supplied with square aperature widths from 20 µm to 125mm, perforated metal plates are supplied in square hole widths from 4mm to 125mm or electroformed sheets are mainly used with hole widths from 5µm to 100µm. They are standardised up to 500µm hole width.
Measuring instruments including test sieves have to be serviced, tested and labeled at regular intervals. Haver & Boecker offers the opportunity to check test sieves by a video analysis system at their works laboratory. For more information and products in the range of sieves and shakers, download the Haver & Boecker Test Sieves and Shakers PDF.
Haver test sieve shakers produce a three dimensional sieving action. The material progresses verically through the meshes, and is distributed in a circular motion over the whole sieving surface. Due to the circular motion particles pass efficiently through the different meshes, reducing the sieving period. The sieving time is finished when the result remains constant.
Without a three dimensional sieving action, for many materials, the end of a sieving time can often be difficult to achieve. In this case a final hand sieving may be necessary.
Haver's G-Control technology ensures self readjusting amplitude utilising permanent acceleration measurement of the whole test sieve tower. For more information and products in the range of sieves and shakers, download the Haver & Boecker Test Sieves and Shakers PDF.