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.
Summary of Specifications:
- Size Range: 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.
- Types of Sieves: Common types include wire woven mesh sieves (0.02mm-2.36mm), metal perforated plate sieves (1mm-125mm), and electroformed sieves (5μm-500μm).
- Sieve Frame Diameters: Typically available in 75mm, 100mm, 200mm, 300mm, and 400mm diameters.
- Accuracy Levels: Classified into three levels by ASTM E11 and ISO 3310-1, with verification methods involving statistical analysis of mesh openings.
- Master-Matched Sieves: These are verified to meet ASTM E11 standards and are performance tested with NIST traceable Standard Reference Materials to ensure uniformity and repeatability.
Detailed Explanation:
- Size Range and Types of Sieves: The range of sizes that test sieves can handle is extensive, from large particles of 125 mm down to very fine particles of 20 microns. For extremely fine particles, special sieves with smaller pore sizes are used, though these are prone to clogging. Techniques like "micro" sieving can measure particles as small as 5 microns. The sieves are categorized based on their mesh type and construction, with stainless steel woven wire mesh being the most common due to its durability and precision.
- Sieve Frame 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.
- 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.
- Master-Matched Sieves: 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.
These specifications ensure that test sieves provide reliable and accurate results, which is vital for quality control and research in various industries.
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