For Laboratory Sieves

What is For Laboratory Sieves?

For laboratory sieves are precision instruments used for particle size analysis and screening of granular materials. They are mainly composed of stainless steel sieve frames and sieves, and have the characteristics of high precision and corrosion resistance. The sieves are divided into woven mesh, perforated plate or electroformed mesh, and the mesh size (mesh number) ranges from 3μm to 125mm. The larger the mesh number, the smaller the mesh size. For example, 200 mesh corresponds to about 74μm, which is suitable for fine powder screening; 10 mesh corresponds to about 2mm, which is suitable for coarse particles.

For laboratory sieves sieves usually adopt a multi-layer screening design, and can use multiple levels of sieves (2~7 layers) at the same time, arranged in order from large to small to achieve particle classification. Common diameters are 75mm, 200mm or 300mm, equipped with a vibrating screen machine or ultrasonic device to improve screening efficiency and reduce blockage. It is widely used in particle size detection and quality control in the fields of chemical, pharmaceutical, geological and other fields to ensure the accuracy and repeatability of experimental results.

What are the types of laboratory sieves?

Laboratory sieves are indispensable tools in particle size analysis. They separate particles of varying sizes using precise apertures, providing essential data for scientific research, quality control, and production processes. Sieves typically consist of a sturdy frame (usually stainless steel) and meshes of varying apertures. Common laboratory sieves include woven mesh, perforated plate, electroformed, and wet sieves, each with its own unique characteristics, suitable for different materials and analytical requirements.

1.Woven mesh screens

The screen is woven from fine metal wires (usually stainless steel) in a specific way to form a precise square or rectangular aperture.

The aperture range is 20μm (micrometer) or even smaller, to a coarse 125mm (millimeter) or larger, suitable for a variety of materials from powders to coarse particles.

Features: Suitable for most conventional dry screening and particle size analysis. With good aperture accuracy, it is widely used in almost all fields requiring particle size analysis, such as pharmaceuticals, food, chemicals, construction, mining, agriculture, etc.

2.Perforated plate screen

The screen surface is made of a solid metal plate (usually stainless steel) through precision stamping or laser cutting to form round or square holes.

Aperture range: usually from about 1mm to 125mm or even larger.

Features: Especially suitable for handling heavier, abrasive or larger samples. The aperture is usually very precise and is common in the construction industry (aggregates, gravel, sand), mining (ores), agriculture (grains, seeds) and other fields that require screening of coarse particles.

3.Electroformed screen

The screen is manufactured by an electrodeposition process, where a metal layer is precisely deposited on a conductive substrate to form a mesh with ultra-high precision and uniformity. The aperture shape is usually round or square.

Pore size range: from 2μm to 150μm or even around 500μm

Features: The pore size is extremely precise and highly uniform, and it can provide very reliable and repeatable micro-particle analysis results. It is mainly used in high-end scientific research, precision chemicals, pharmaceuticals (active drug ingredients), electronic materials, ceramic powders and other fields that require extremely high-precision micro-particle analysis.

4.Wet screening

Usually based on woven mesh screens or perforated plate screens, it is designed for screening in the presence of water or other liquids

Features: When the sample contains sticky substances (such as clay, silt), or the particles are prone to agglomeration, dry screening may not be able to effectively separate. Wet screening can wash away the fine substances attached to the particles through the action of water flow, helping the particles to disperse and pass through the screen.

Application: Widely used in geological exploration, soil analysis, aggregate industry (cleaning sand and gravel), ceramic industry (removing clay), and certain food and chemical fields to separate and clean wet powders or particles.

Mesh size and aperture comparison table for laboratory sieves

Number	Mesh (mm)	Number	Mesh (mm)	Number	Mesh (mm)	Number	Mesh (mm)
2	13	26	0.71	90	0.16	260	0.06
3	6.5	28	0.63	100	0.154	280	0.055
4	5	30	0.6	110	0.14	300	0.054
5	4	32	0.55	115	0.13	320	0.048
6	3 .2	36	0.5	120	0.125	325	0.045
7	2.8	40	0.45	130	0.111	350	0.041
8	2.5	45	0.4	140	0.105	360	0.4
9	2.2	50	0.355	150	0.1	400	0.0385
10	2	55	0.315	160	0.098	500	0.03
12	1.6	60	0.3	180	0.09
14	1.43	65	0.25	190	0.08
16	1.25	70	0.22	200	0.075
18	1	75	0.2	220	0.07
20	0.9	80	0.18	240	0.065
24	0.8	85	0.17	250	0.063
Specifications of stainless steel sample sieves. If you need special specifications, please contact online customer service for consultation.

International standard Size For Laboratory Sieves

ASTM E11		ISO 565/3310-1
Standard	Alternate	Size
100.0mm	4in	-
90.0mm	3 1/2in	-
75.0mm	3in	-
63.0mm	2 1/2in	63.0mm
-	-	56.0mm
53.0mm	2.12in	53.0mm
50.0mm	2in	50.0mm
45.0mm	1 3/4in	45.0mm
-	-	40.0mm
37.5mm	1 1/2in	37.5mm
-	-	35.5mm
31.5mm	1 1/4in	31.5mm
-	-	28.0mm
26.5mm	1.06in	26.5mm
25.0mm	1in	25.0mm
22.4mm	7/8in	22.4mm
-	-	20.0mm
19.0mm	3/4in	19.0mm
18.0mm	-	18.0mm
16.0mm	5/8in	16.0mm
-	-	14.0mm
13.2mm	0.530in	13.2mm
12.5mm	1/2in	12.5mm
11.2mm	7/16in	11.2mm
-	-	10.0mm
9.5mm	3/8in	9.5mm
-	-	9.0mm
8.0mm	5/16in	8.0mm
-	-	7.1mm
6.7mm	0.265in	6.7mm
6.3mm	1/4in	6.3mm
5.6mm	No. 3 1/2	5.6mm
-	-	5.0mm
4.75mm	No.4	4.75mm
-	-	4.50mm
4.00mm	No.5	4.00mm
3.55mm	-	3.55mm
3.35mm	No.6	3.35mm
-	1/8in*	-
3.15mm	-	3.15mm
2.80mm	No.7	2.80mm
-	-	2.50mm
2.36mm	No.8	2.36mm
2.00mm	No.10	2.00mm
-	-	1.80mm
1.70mm	No.12	1.70mm
-	-	1.60mm
1.40mm	No.14	1.40mm
-	-	1.25mm
1.18mm	No.16	1.18mm
-	-	1.12mm
1.00mm	No.18	1.00mm
-	-	900µm
850μm	No.20	850µm
-	-	800µm
710μm	No.25	710µm
-	-	630µm
600μm	No.30	600µm
-	-	560µm
500μm	No.35	500µm
-	-	450µm
425μm	No.40	425µm
-	-	400µm
355μm	No.45	355µm
-	-	315µm
300μm	No.50	300µm
-	-	280µm
250μm	No.60	250µm
-	-	224µm
212μm	No.70	212µm
-	-	200µm
180μm	No.80	180µm
-	-	160µm
150μm	No.100	150µm
-	-	140µm
125μm	No.120	125µm
-	-	112µm
106μm	No.140	106µm
-	-	100µm
90μm	No.170	90µm
-	-	80µm
75μm	No.200	75µm
-	-	71µm
63μm	No.230	63µm
-	-	56µm
53μm	No.270	53µm
-	-	50µm
45μm	No.325	45µm
-	-	40µm
38μm	No.400	38µm
-	-	36µm
32µm	No.450	32µm
25µm	No.500	25µm
20µm	No.635	20µm

What are the classifications and distinctions of laboratory sieves?

Type	Mesh size range	Main purpose	Advantages
Woven mesh sieve	20μm-several millimeters	Dry fine particle screening	Low cost, uniform mesh
Perforated plate sieve	1mm-125mm	Coarse particle screening	Durable and suitable for heavy loads
Electroforming sieve	3μm-100μm	Ultrafine powder high-precision screening	High precision, consistent mesh
Wet sieve	10μm-several millimeters	Wet or sticky material screening	Suitable for wet materials, reduce clogging

How do laboratory sieves work?

The laboratory sieving process usually involves stacking a series of sieves of different apertures in descending order to form a sieving hierarchy. The sample is placed on the top sieve, and then the particles are forced down through each layer of the sieve by mechanical vibration (using a sieving machine). In this way, particles of different sizes are separated and retained on the corresponding sieves, thereby achieving an accurate analysis of the sample particle size distribution.

What is the aperture range of different laboratory sieves?

The aperture range of sieves is very wide, ranging from very large sizes to very fine sizes depending on different application requirements and manufacturing standards.

Large aperture: ranging from 4.75 mm (approximately equivalent to 4 mesh) to 2.00 mm (10 mesh), suitable for screening larger particles.

Medium aperture: ranging from 1.00 mm (18 mesh) to 0.250 mm (60 mesh), commonly used for general powder and granular material classification.

Small aperture: from 0.150 mm (100 mesh) to 0.038 mm (400 mesh), this type of sieve is suitable for finer material screening.

Micro aperture: less than 0.038 mm, such as 0.025 mm or smaller, can even reach a few microns (μm), this level of sieve is usually used for particularly fine material analysis.

What is a sieve used for in the laboratory?

For labratory sieves are widely used in particle size analysis and material classification in many industries. With their high precision and multi-layer screening characteristics, they play a key role in scientific research and quality control. In the pharmaceutical industry, sieves are used to screen drug powders to ensure uniform particle size (such as 200 mesh to screen particles below 74μm) and optimize drug efficacy and solubility; in geological research, multi-layer sieves (10 mesh to 100 mesh) are used to analyze the particle size distribution of soil or ore and judge geological characteristics; in the food industry, sieves are used to detect the fineness of raw materials such as flour and powdered sugar and remove impurities.

In the chemical industry, catalyst or pigment particles are screened (such as using a 20μm electroforming sieve) to ensure reaction efficiency or coating quality; in the environmental protection field, wet screening is used to analyze suspended particles in sewage treatment and evaluate water quality. For laboratory sieves sieves are usually equipped with vibration or ultrasonic devices, combined with 2 to 7 layers of sieves, to achieve grading from coarse particles to ultrafine powders, meeting the precise needs of different scenarios.

What is the purpose of laboratory sieves?

For Laboratory Sieves, often referred to as test sieves or standard test sieves, are fundamental tools in particle analysis. With precisely controlled mesh sizes, they effectively separate powders and granular materials to determine the sample's particle size distribution. Whether used for scientific research, product quality control, or production process optimization, For Laboratory Sieves provide accurate and reproducible particle size data.

Through sieves with different mesh sizes, the material is graded according to the particle size and the particle size distribution is determined. It is often used for quality control and research. For example, in the pharmaceutical industry, it is used to analyze the size distribution of drug particles to optimize the drug absorption characteristics.

Remove impurities or particles that do not meet the specifications in the material to ensure the purity of the sample. It is suitable for chemical, food, pharmaceutical and other industries.

Divide the material into different particle size segments (such as 2~7 particle segments) for material property analysis in geology, metallurgy, building materials and other fields.

Suppliers for laboratory sieves

In the field of laboratory sieve supply, Xinxiang Dahan Machinery Co., Ltd. is one of the more common equipment manufacturers in China, providing a variety of standard laboratory sieves and supporting equipment.

These laboratory sieving equipment usually have precise mesh sizes to meet various needs from rough screening to fine analysis. In addition, Dahan Machinery may also provide sieves that meet international standards (such as ISO, ASTM, etc.) to ensure the accuracy and repeatability of experimental results.

If you need to contact Dahan Machinery for more information about laboratory sieves, including product catalogs, quotes or technical support, it is recommended to contact customer service directly. This will provide the most accurate and up-to-date information.