Wet sieve analysis is essential for materials that cannot be accurately analyzed by dry methods. Electromagnetic sieve shakers enhance this technique significantly.
When Wet Sieving is Required
Problem Materials
- Powders that clump or agglomerate
- Materials carrying static charge
- Fine particles below 50 microns
- Hygroscopic materials
Applications
- Pharmaceutical excipients
- Food ingredients
- Mineral processing
- Chemical analysis
How Wet Sieving Works
Basic Process
- Sample is suspended in liquid (usually water)
- Suspension is poured onto sieve stack
- Liquid carries particles through appropriate meshes
- Fractions are collected and dried for weighing
Electromagnetic Enhancement
The RSS-1 with wet sieving kit provides:
- Controlled spray nozzle for consistent liquid flow
- Collection outlet for efficient fraction recovery
- Vibration to prevent mesh blinding
- Reproducible results
Advantages of Electromagnetic Wet Sieving
Improved Separation
Three-dimensional vibration helps particles find mesh openings even in liquid suspension.
Reduced Analysis Time
Efficient vibration combined with liquid flow speeds separation of difficult materials.
Better Reproducibility
Controlled parameters ensure consistent results across analysts and laboratories.
Prevented Clogging
Vibration keeps mesh openings clear, especially important with fine materials.
Practical Considerations
Liquid Selection
- Water for most applications
- Solvents for water-sensitive materials
- Surfactants to improve wetting
Sample Recovery
- Careful drying of fractions
- Accounting for dissolved material
- Mass balance verification
Equipment Care
- Thorough cleaning after wet sieving
- Proper drying of sieves
- Regular mesh inspection
Quality Considerations
Wet sieve analysis requires:
- Validated procedures
- Trained operators
- Proper documentation
- Regular equipment verification