Mechanical Sieves
Mechanical Sieves
Mesh device used to strain solids from liquids and manually separate particles by size; sieves can be constructed of metal or plastic. Products include sets, macro and micro sieve sizes, sifters and beads, etc.
What Is a Sieve?
Sieves are mesh strainers. They are typically round, with solid metal walls connected to a woven metal screen. They are often used with sieve receivers that collect the material that falls through the sieve. To prevent loss and contamination of the material, it can be protected by a sieve cover. Sieve covers are also necessary for covering the top sieve when multiple sieves are stacked on a laboratory shaker.
What Is Sieving?
Sieving is a technique for separating a sample into particles of different sizes. Sieving can be used to separate stones from sand and is used in the food industry to help eliminate contamination by foreign bodies.
Analysis by sieving may require a single sieve or a set of mesh sieves, arranged by decreasing size of the mesh openings. Air flow, liquid, vibration, or another mechanical method is used to move the sample particles through the screens.
Critical variables include sample size, agitation parameters, duration, and end point determination. Sample properties, like hygroscopic or electrostatic tendencies, can present analytical challenges, and some samples may need to be suspended in a liquid for accurate measurement.
Types of Sieves
Sieve frames and meshes may be stainless steel or brass. Common diameters are 3, 8, and 12 in. and 200 and 300mm; non-standard sieves may have other diameters, including 6, 10, and 18 in. Heights range from 1 to 9 in. and may be designated as full, intermediate, or half-height.
ASTM E-11 establishes criteria and tolerances for the openings in the woven wire mesh for standard sieve sizes. Some sieves are also traceable to NIST or must meet ISO 3310-1.
Biodesign™ Nylon Matrix Filter CellMicroSieves™
Allow the rapid, yet gentle, isolation of cells, organelles, or cellular debris.
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RETSCH Test Sieves - 13 Mesh or Less
Stainless steel with wire gauze
Biodesign™ BioPrepNylon™ Matrix Filters
Many biological preparations begin with extractions that require coarse filtration to remove cellular debris. Bulk filtration using cheesecloth absorbs much of the extraction fluid, while membranes clog quickly. BioPrepNylon™ produces rapid bulk filtration at extraordinary flow rates.
Retsch™ Bottom Sieves SM with Square Holes
Retsch™ Bottom Sieves SM with Square Holes are suitable for use with Cutting Mill SM 200.
Retsch™ Test Sieve with Calibration Certificate
Retsch™ Test Sieve is supplied with a Calibration Certificate that shows the exact measuring data of the mesh and a statistical evaluation of the data.
Linker Industrietechnik™ Stainless Steel Test Sieve with PVC Welding, 200 Dia. x 50 mm Height
Sifts particles in a wide range of pore sizes. These stainless-steel test sieves have PVC welding and an internal height of 50 mm and diameter of 200 mm.
Endecotts™ Stainless Steel Test Sieve
Woven wire test sieves for all types of laboratory sampling and particle size analysis
RETSCH Stainless Steel Collecting Pan with Outlet for Test Sieves
Collects resulting samples from test sieves. These stainless steel pans are compatible with multiple test sieves and sieve shakers, based upon the required diameter. Outlet allows draining of liquids during wet sieving.