Test sieves are specialized tools used in laboratories for particle size determination, separation, and classification of materials such as powders, bulk cargoes, and suspensions.
These sieves are crucial for providing accurate particle analysis, which is essential for various manufacturing processes.
The specifications for test sieves are governed by international standards such as ASTM E11 and ISO 3310, which define the quality thresholds and accuracy levels for sieve construction.
4 Key Factors to Consider When Choosing Test Sieves
1. Size Range and Types of Sieves
Test sieves can measure solid particles ranging from 125 mm to as small as 20 microns.
Special techniques can extend this range down to 5 microns.
Common types include wire woven mesh sieves (0.02mm-2.36mm), metal perforated plate sieves (1mm-125mm), and electroformed sieves (5μm-500μm).
2. Sieve Frame Diameters
Test sieves are typically available in 75mm, 100mm, 200mm, 300mm, and 400mm diameters.
The choice of sieve diameter depends on the volume of material to be sieved and the specific requirements of the test.
Larger diameters are suitable for larger volumes or coarser materials, while smaller diameters are used for finer materials or when space is limited.
3. Accuracy Levels and Verification
ASTM E11 and ISO 3310-1 define three levels of accuracy for test sieves.
Verification involves measuring a sample of mesh openings and statistically analyzing their sizes to ensure they fall within the specified tolerances.
This process is crucial for maintaining the integrity of particle size analysis.
4. Master-Matched Sieves
Master-matched sieves are verified to meet ASTM E11 standards and are performance tested with NIST traceable Standard Reference Materials to ensure uniformity and repeatability.
These sieves are particularly important in applications where consistency across multiple testing sites is critical.
They are matched to a master set maintained by the manufacturer, ensuring that results from different locations can be compared directly.
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