Laboratory Sieves

What is a laboratory sieve

The laboratory sieve is a device dedicated to particle grading and particle size analysis of small batches of materials. It has the characteristics of compact structure, simple operation and high screening accuracy. The mesh has a wide range of apertures and is suitable for particle size detection and screening of materials in various forms such as powders, granules, and liquids. It is commonly used in pharmaceutical, chemical, food, metallurgy, scientific research and other industries.

The screening process achieves efficient grading of multi-layer sieves through vibration drive, which can quickly separate materials of different particle sizes to ensure the accuracy and repeatability of the analysis results. It is suitable for materials with strict particle size requirements such as Chinese medicine powder, metal powder, cosmetic raw materials, and ceramic raw materials.

Classification of commonly used sieves in laboratory sieves

There are many types and specifications of laboratory sieves, and common ones are sieves with different diameters (such as 200mm, 300mm), different materials (such as stainless steel), and different mesh sizes. It is usually used in conjunction with a sieving instrument to achieve a more efficient and standardized screening process. In the laboratory, sieves are mainly used for particle size grading, particle size analysis (screening analysis) of granular materials, and separation of solids.

1.Classification by screen material

Wire woven mesh screen: woven from metal wire (such as stainless steel, brass, etc.), with precise aperture, suitable for fine to medium particle size analysis (∼0.02mmto2.36mm), widely used in most dry and wet screening.

Metal perforated plate screen: stamped from metal plate, with large aperture, round or square shape, suitable for larger particle size (1mmto125mm), such as coarse screening of ore and coal or occasions with extremely high requirements for sieve plate strength. It is rarely used in fine particle size analysis.

Electroforming screen: formed on the mold by electroplating metal, with very precise and uniform aperture, suitable for very fine particles (5μmto500μm), widely used in precise screening analysis of ultrafine powders (such as pigments, ceramic powders, and drug powders), with a fineness range that conventional woven meshes cannot reach.

2. Comparison table of commonly used sieves in laboratories

Material type	Picture	Material characteristics	Applicable scenarios	Advantages	Disadvantages	Corrosion resistance	Common mesh range
Brass test sieve		Screen and sieve frame are brass or brass edging	Suitable for dry screening, especially for samples that react to iron or are sensitive to conductivity	Not easy to generate static electricity, good conductivity, wear resistance	Easy to oxidize and discolor, the price is relatively high	General	4 mesh to 200 mesh
Stainless steel test sieve		Screen and sieve frame are made of stainless steel (commonly used 304/316L)	Suitable for hygienic or corrosion Industries with high requirements for performance, such as medicine, food, and chemical industry	corrosion resistance, high temperature resistance, high strength, easy to clean	slightly higher cost	excellent	4 mesh to 500 mesh or even finer
Nylon test sieve		The mesh is made of nylon or polyester, and the sieve frame is mostly plastic or metal edging	wet screening, or used for materials sensitive to metal contamination such as ceramics, powder metallurgy, etc.	strong flexibility, not easy to break, light weight	the accuracy is not as good as metal mesh, and it is easily affected by temperature	good (acid and alkali resistant but not high temperature resistant)	about 10 mesh to 400 mesh

What is the purpose of laboratory sieves?

The purpose of laboratory sieves is to perform particle size analysis and graded separation of solid particles to determine the particle size distribution of samples or separate particles by size.

Particle size distribution determination: analyze the proportion of particles of different particle sizes in the sample, which is used to study the physical properties of materials or quality control.

Particle separation: grade the sample by particle size to separate particles of a specific size to meet experimental or production needs.

Quality control: ensure that products (such as powders, soils, minerals, etc.) meet particle size specifications.

Research and development: Provide particle characteristics data for materials science, pharmaceuticals, food processing and other fields to support experimental research.

Technical parameters of laboratory sieves

Product Name	Laboratory Sieves
Diameter	200mm, 300mm
Layers	1-8 layers available
Materials	Stainless steel 304 or 316
Voltage	220V, 50HZ, Single phase or As your require
Power	0.125KW
Speed	1440RPM
Noise	<50db
Amplitude	≤5mm
Mesh size	2-500mesh/ Can be customized
Usage	Classification, particle size distribution
Overall dimension	450×415×800mm
Weight	45kg

What are the uses of laboratory sieves?

The main purpose of laboratory sieves is to classify and analyze the particle size of powder or granular samples. In practical applications, laboratory sieves are widely used in many fields. For example, in the food industry, sieving can be used to detect the coarseness of flour, ensure the fineness of sugar powder, or separate particles of different sizes in mixed materials, such as grain grading. In the pharmaceutical industry, sieving is used to control the particle size distribution of drug powders, which directly affects the solubility, absorption rate, and tablet compression processes of drugs.

In geological research, soil or sediment samples can be sieved to analyze the content of components of different particle sizes, thereby inferring geological processes. In the field of materials science, sieving can be used to prepare powder materials with a specific particle size range, such as raw materials for sintering or coating processes. In addition, in environmental monitoring, sieving is also often used to separate particle pollutants of different sizes in water or soil samples. In summary, laboratory sieves provide important particle size information for scientific research and industrial production through physical separation, thereby guiding process optimization and quality control.

Particle size distribution analysis (such as soil, powdered metal, abrasive, etc.)

Particle size control of pharmaceutical raw materials

Food particle screening (such as flour, powdered sugar, etc.)

Chemical raw material testing

Cement and sandstone particle analysis in the building materials industry

Guide to using laboratory sieves

Laboratory sieves are mainly used for particle size analysis to help determine the size distribution of granular materials. Proper use of laboratory sieves can not only improve work efficiency, but also ensure the accuracy of experimental results.

Preparation: Select sieves with appropriate apertures and materials according to the characteristics of the material and experimental requirements. For example, for fine powdery substances, you may need to choose a sieve with a finer aperture; for corrosive substances, you need to choose a sieve made of corrosion-resistant materials. Make sure the sieve is clean and free of impurities before use to avoid affecting the experimental results.

Sample preparation: Sampling correctly ensures that the sample is representative and avoids result deviations caused by uneven sampling. In some cases, pretreatment steps such as drying or crushing may be required to ensure the smooth screening process.

Sieving operation: Stack the required sieves in order from large to small sieve apertures, with the bottom cover at the bottom and the top cover at the top. Put an appropriate amount of sample into the top sieve, and be careful not to overdo it to avoid affecting the screening effect. If a mechanical screening machine is used, the parameters (such as vibration frequency, time, etc.) should be set according to the equipment manual, and then the equipment should be started for screening.

Result analysis: After the screening is completed, collect and weigh the weight of the materials on each sieve layer. Calculate the proportion of materials in different particle size ranges based on the weight of the sieve residue, and draw a particle size distribution curve.

Cleaning and maintenance: After the screening is completed, clean the residual materials on the sieve in time and clean it thoroughly. Check the sieve regularly for damage. If it is damaged, it should be replaced in time to ensure the accuracy of subsequent experiments.

Laboratory sieve price

The price of Laboratory Sieves (also called standard test sieves or analytical sieves) varies depending on factors such as brand, model, material, sieve frame diameter, mesh size, and whether it is equipped with vibration screening equipment.

Single sieve: The price of ordinary standard test sieves (200mm or 300mm in diameter, made of stainless steel, noodles or phosphor bronze) usually ranges from tens to hundreds of yuan. For example, the price of a wire mesh sieve with a diameter of 200mm may be negotiable or between 100-500 RMB, depending on the mesh size and material.

Vibrating screening equipment: Laboratory vibrating screening machines (such as 200 or 300 models) usually cost between 1,000 RMB and several thousand RMB.

Complete test sieve set: The price of a standard test sieve set (for particle size classification) with graded sieves depends on the number of sieves and supporting equipment.

Material type	common diameter	mesh range	single price reference (USD)
Stainless steel test sieve	200mm(8 inch)	4–500mesh	$10–$40/pc
Brass test sieve	200mm (8 inch)	4–200 mesh	$12–$35/pc
Nylon test sieve	200mm (8 inch)	10–400 mesh	$6–$20/pc
Galvanized iron sieve	200mm(8 inch)	2–100 mesh	$4–$12/pc
High-precision laser sieve/electroforming sieve	200mm	100 mesh+	$70–$250/pc
Small size test sieve	100mm (4 inch)	various mesh	$5–$20/pc
Large size test sieve	300mm (12 inch)	various mesh	$15–$60/pc