Sieve Analysis
Particle size determination by Sieving dates back to the time of the ancient Egyptians. The continuing use and popularity of this technique can be attributed to the fundamentally simple principle, methodology, historical reference, and cost effectiveness. An analysis consists of using sieves (typically woven wire mesh), decreasing in opening size, to separate or classify a sample by particle size. A known mass of sample is added to the top sieve then dispersed through the mesh opening until a stable mass is reached on each sieve in the stack. The mass remaining on the sieve is measured and reported as a percentage of the sample mass that is larger than the verified woven wire mesh opening size. Vibration, air entrainment and flowing liquid are all dispersion methods that can be used to move the sample through the mesh.
This testing is recognized by numerous guidance agencies including the ISO, ASTM, USP, and EP. Several factors must be considered when developing a robust sieving method or performing a routine quality analysis. Sample size, sieving duration, controlled agitation parameters and end point determination are all critical method variables. PTL’s various sieving capabilities and detailed procedures, which incorporate the topics above, ensure that the best possible results are generated. For optimal quality control, PTL verifies its in-house sieves with an external vendor for compliance with the ASTM E-11 standard.
A wide variety of sample types can be analyzed for particle size classification using the sieving technique. Industries that typically use this technique include, but are not limited to, pharmaceutical, industrial, agricultural, environmental and chemical. Common applications of this analysis include quality assurance, batch testing, comparative studies, environmental studies as well as research and development.
A well-executed sieve analysis provides more than a simple particle size distribution because it can identify changes that may affect processing efficiency, product consistency, and final performance. Manufacturers frequently compare production lots, validate raw material specifications, and monitor process stability by tracking shifts in particle size over time. Particle Technology Labs develops customized procedures that account for each material’s unique characteristics, ensuring reliable and repeatable sieve screen analysis results. When appropriate, our lab experts can also recommend complementary particle characterization techniques to provide additional insight when sample properties extend beyond the practical limits of traditional sieving. Below is a list of advantages and considerations of PTL’s sieve analysis:
Advantages
- Broad size range can be analyzed; 45 µm up to inches
- Provides a weight percent distribution
- Cost Effective
Considerations
- Assumes all particles are spherical; elongated and flat particles can cause error to the results
- Recommend alternative particle sizing technique for populations below 45 um
- Material with high hygroscopic or electrostatic properties can lead to challenges
Sample Requirements
Ideal sample amount for Standard Sieve Stack is 100 grams.
For Sonic Sifter and Air Jet testing, 10 to 30 grams is preferred.
The above sample quantities are preferred. If sample availability is further limited, please contact us to share specifics about your sample and options for suitable sample quantities.
Detection Range
Sieving from 45 µm and above is recommended for Standard.
Air Jet Sieving is capable of sizing from 20 µm to 1400 µm, however, alternative particle sizing techniques are recommended below 45 µm.
Data Reported
Sieve results are reported as the differential weight percent retained on each sieve as well as the cumulative weight percent less than the sieve size. Specific reporting requirements are easily adjusted based on the client’s request.
Sample Reports
Instrumentation
• Hosokawa Micron Air Jet Sieve (MAJS) with standard 200 mm diameter, half height sieves (if multiple sieves requested, analyzed one at a time)
• Dry Sieve Stack (up to 7 standard 8″ diameter sieves)
• Wet sieve stack (up to 7 standard 8″ diameter sieves)
Hosokawa Mikro Air Jet Sieve, Model X (MAJSx)
