Particle Release from Wipers and Other Materials

Test Method 22Test Method 22

Particle Release from Wipers and Other Materials Under Conditions of Moderate Mechanical Stress

This test method details the extraction and enumeration of particles and fibers released from wipers (or other materials) in a wetted state, under conditions of moderate mechanical stress.

"After extraction, particle quantification is carried out using a Liquid Particle Counter (LPC).

Two LPCs both manufactured by Particle Measuring Systems (PMS) are being used. One unit, LiQuilaz S02 is used for counting particles from 0.2 μm and up, and the second, LiQuilaz S05 for 0.5 μm and up.

For all practical purposes only the cumulative number of particles is reported, though information on number of particles in different size ranges are available from the instrument. S02 with a channel setting of 0.2, 0.5, 1.0, 1.5 and 2.0 μm will count number of particles of these dimensions, and all particles larger than 2 μm will be included in the 2 μm channel. Similarly with S05 all particles larger than 20 μm will be included in the 20 μm channel. Quantification of particles in a solution by LPC is limited to concentrations of not more than 10,000 particles per mL in total. Quantification of sample extracts with greater than 10,000 counts per mL can be accomplished through appropriate dilutions."