Contamination problem cleaning operation, device

Who Exfoliated In the Cleaning Tank A contamination problem developed In a device line cleaning operation particulate contamination monitors (flamed SI wafers) showed many particulates, as In Figure 11. [(done In-sltu because SI Is 50Z transmissive In the Infrared.)] The In-sltu small area Infrared spectrum (Indicates) zeln, a corn-derived protein, which has over 100 commercial uses, many In paper processing. However, as bare paper Is not allowed In this clean area, another source of zeln had to be found. Zeln Is also widely used In cosmetics as a powder or "pancake" make-up base. Thus, In all likelihood, some operator had violated the rules regarding cosmetics In the clean room, and "exfoliated" over the cleaning station tanks. 

Waterside problems that lead to decreases in efficiency and material deterioration can be caused by a variety of mechanisms, such as electrochemical corrosion and deposition of foulants. These problems can be exacerbated by low flow, poor operational practice, process contamination, or specific stresses. It is also important to try to determine cause and effect relationships in order to provide a logical and practical water treatment solution. Such a solution will usually involve some form of cleaning, plus a combined engineering and chemical action plan. Inspection may be made easier by the use of a Boroscope or similar optical/video recording device. The color, texture, and quantity of all deposits should be noted, measurements of pits taken, and microbiological contaminants analyzed. It may be useful to conduct biocide efficiency tests on bacterial slimes. The period when a heat exchanger is open for inspection may be an opportune time for the permanent installation of ports for corrosion-monitoring probes. 

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