Test sieves come in various sizes, depending on the specific application and the size range of particles being measured. The ASTM test sieves are available in diameters of 3in (76mm), 6in (152mm), 8in (203mm), 10in (254mm), 12in (305mm), and 18in (457mm). These sieves have full or half-height frames and different sieve sizes for a wide range of particle sizes.
Laboratory test sieves also come in different sizes. Some common laboratory sieve sizes include:
1. 3" (75mm) diameter screens with mesh sizes ranging from 4 mesh (4.75 mm) to 500 mesh (0.025 mm)
2. 8" (200mm) diameter screens with mesh sizes ranging from 4 mesh (4.75mm) to 500 mesh (0.025mm)
3. 12" (300mm) diameter screens with mesh sizes ranging from 4 mesh (4.75mm) to 500 mesh (0.025mm)
4. 18" (500mm) diameter screens with mesh sizes ranging from 4 mesh (4.75mm) to 325 mesh (0.045mm)
5. 24" (600mm) diameter screens with mesh sizes ranging from 4 mesh (4.75mm) to 325 mesh (0.045mm)
The mesh or sieve size of the lab sieve depends on the specific application and the size range of the particles being measured. Generally, a larger mesh size is used for larger particles, while a smaller mesh size is used for smaller particles.
Lab sieves are used in the laboratory to measure particle size. They can be made of different materials, such as brass, stainless steel, or a brass frame with stainless steel mesh. The diameter of lab sieves can vary from 75mm to 500mm, and the sieve size ranges from 4mm to 38 microns.
When stacked on a vibrating screen, the top test screen has the largest mesh size, while the bottom screen has the smallest mesh size. The sieve cover is used to protect stored test sieves from dirt and dust. The frame of the sieve is a circular metal ring that holds the mesh in place and can be made of stainless steel or brass. The skirt of the sieve allows for stacking without tipping over.
In selecting the type of sieve to fit your needs, you need to consider the separation media. Most sieves use metal or synthetic woven wire mesh as the separation medium. Perforated metal plates and electroformed mesh are alternative separation media. The range of opening sizes for conventional ASTM/ISO test sieves with woven-wire mesh is 125mm to 20µm (5.0in to No.635).
The frame diameter of the sieve is important in matching the size of the sieve to the sample volume. If the sample volume is too large for a small frame, particles may not find sieve openings, resulting in poor separations and incomplete size fractions. A rule of thumb is that no more than one or two layers of material should remain on a sieve after separation is complete.
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