Analytical success in laser diffraction depends on several parameters :
• Obtaining a good sample
• Sample preparation
• Perfecting the analysis procedure

OBTAINING A GOOD SAMPLE 
Objective: to obtain a representative portion of a representative sample taken from the supply source.

SAMPLE PREPARATION
Sample preparation depends on degree of heterogeneity, particle size agglomeration state, and set extraction means ands sample extraction for analysis.

SOPs -- ANALYSIS PROCEDURE
To perfect an analysis procedure, user has to select dispersion procedure :
• Dry Procedure,
• Liquid Procedure. 

Selection depends upon the use and properties of the product. 
Selection of dispersion procedure - Product state :