The maximum sieving deviation permitted is not explicitly stated in the provided references. However, the references discuss the importance of optimal sieving time, amplitude, speed, and the use of Master-Matched sieves to ensure uniformity and repeatability in sieve analyses. The use of Master-Matched sieves, which are verified to meet ASTM E11 standards and performance tested with NIST traceable Standard Reference Materials, suggests a high level of precision and accuracy in sieve analysis. This implies that deviations from the nominal sieve opening sizes are carefully controlled and minimized to ensure the reliability of the sieving process.
The references emphasize the need for careful selection of sieving parameters such as time and amplitude, which are crucial for achieving accurate results. For instance, if a sieve has openings larger than the nominal size, running the test for a longer duration increases the likelihood of larger particles finding these oversize openings, potentially leading to inaccurate results. Similarly, the presence of elongated particles in the sample may require a longer sieving time to ensure they pass through the openings correctly.
The use of Master-Matched sieves, which are calibrated against a master set maintained by the manufacturer, ensures that sieves used in different locations provide uniform and repeatable results. This practice minimizes the deviation from the standard sieve specifications and enhances the accuracy of particle size analysis.
In summary, while the exact maximum permitted sieving deviation is not provided, the references highlight the importance of adhering to strict standards and practices, such as using Master-Matched sieves and optimizing sieving parameters, to minimize deviations and ensure the accuracy and repeatability of sieve analyses.
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