Wet Sample Preparation for Laser Particle Size Analyzer – Part 2
2025-10-21Bettersizer
Wet Sample Preparation for Laser Particle Size Analyzer – Part 2
Sampling & Loading
l Observe first 30–60 s: drifting obscuration may indicate dissolution or swelling.
l Avoid foaming: add sample along the tank wall.
l Representative sampling: homogenize, pipette from ~1/3 above bottom, transfer completely.
Special Samples
l Water-soluble powders: use saturated solution method, measure quickly. Small particles dissolving → D50 biased large, D90 biased small.
l Swelling materials (clay, cellulose, starch, SAP): prefer non-aqueous media, shorten measurement time, or consider dry dispersion.
QC Checkpoints
l Obscuration: keep 8–12%.
l Repeatability: D10≤±2%；D50≤ ±1.5%； D90 ≤±3%
Cleaning & Compatibility
l Flush and clean sample cell/flow path immediately after use.
l Strong polar solvents (e.g., NMP) → only use with PEEK/PTFE/stainless steel.
l Improper solvent use or cleaning may not be covered under warranty.
This Lab Tip provides general recommendations. For complex formulations, please contact Bettersize technical support.
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