When it comes to sieving deviation, the maximum permitted level is not explicitly defined in the provided references.
However, these references do emphasize the importance of several key factors to ensure uniformity and repeatability in sieve analyses.
4 Key Factors to Consider for Optimal Sieving
1. Optimal Sieving Time
The time spent sieving is crucial. Too little time may not allow all particles to pass through the sieve, while too much time can lead to over-sieving and potential damage to the particles.
2. Amplitude and Speed
The amplitude and speed of the sieving process play a significant role. Proper adjustment of these parameters ensures that particles are evenly distributed and that the sieving process is efficient.
3. Use of Master-Matched Sieves
Master-Matched sieves are verified to meet ASTM E11 standards and are performance tested with NIST traceable Standard Reference Materials. This high level of precision and accuracy helps minimize deviations from nominal sieve opening sizes.
4. Careful Selection of Sieving Parameters
Selecting the right sieving parameters is essential for achieving accurate results. For example, 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.
The Importance of Master-Matched Sieves
Master-Matched sieves are calibrated against a master set maintained by the manufacturer. This ensures that sieves used in different locations provide uniform and repeatable results.
This practice minimizes the deviation from standard sieve specifications and enhances the accuracy of particle size analysis.
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