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PARTICLE QUANTIFICATION AND CHARACTERIZATION METHOD

IP.com Disclosure Number: IPCOM000005945D
Original Publication Date: 1990-Oct-01
Included in the Prior Art Database: 2001-Nov-19
Document File: 1 page(s) / 47K

Publishing Venue

Motorola

Related People

Robert Governal: AUTHOR

Abstract

A particle quantification and characterization method quantifies particles down to 0.2 microns and classifies the particles according to their reactions to a staining chemical. The method may be used to measure micron and sub- micron particles on surfaces including tables, walls, doors and garments.

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MOlYlROLA Technical Developments Volume 11 October 1990

PARTICLE QUANTIFICATION AND CHARACTERIZATION METHOD

by Robert Governal

   A particle quantification and characterization method quantifies particles down to 0.2 microns and classifies the particles according to their reactions to a staining chemical. The method may be used to measure micron and sub- micron particles on surfaces including tables, walls, doors and garments.

   A Class 10 clean room swab is used to collect particles from a surface or garment of given size. The particles are removed from this swab in a beaker of DI water with agitation. The water is drawn through a 0.2 micron membrane which is then stained by the Monsanto technique and placed under a microscope at 1500X magnification. The Nomura test method is then employed to count the particles whose size may be measured down to 0.2 microns by micrometer calibration.

   The stain allows for particle characterization of bacteria, black particles (PVC, carbon or silica), black crystals (chemically exhausted DI resins) yellow crystals (DI resin fragments or stainless steel pipe fragments) small pinks (negatively charged colloids or bacteria fragments less than 2.0 microns in size, large pinks (same as small pinks, but greater than
2.0 microns in size), purple particles (positively charged colloids or bacterial fragments) and "others". "Others" consist of clear particles that do not take up stain such as PVDF, Teflon, PFA Fines, long colored fibers great...