However, there are no specific general standards like IP and NEMA for particulate matter generated by normal wear and tear of a product. Protection from particulate matter created by wear and tear will take some creative investigation and is usually 'specified' in a Quality Assurance program for the product.
Examples of Particulate matter caused product failures:
- Disabled-assisted devices (e.g., motorized wheel chair, lifts) used in a sawmill or outside in dry, windy climates may eventually become mechanically inoperable without periodic maintenance.
- Food and drug containers with loose-fitting housings can cause contamination of the content before it's "use by" date is reached.
- Ill-fitting seals on rotating shafts and bearings will cause the lubricant to become contaminated and ineffective.
- Small electromechanical components, if assembled in a particulate environment, may carry contamination into the main product.
- Smoke and dust can collect around electronic components and, at certain humidity levels, will create a dielectric breakdown between two circuits - causing a short.
- During Desert Storm M1 tanks became immobilized due to the amount of sand drawn into the engine filters causing 'unplanned' battlefield retrofitting and maintenance.
- Office printers creating paper dust in offices can interfere with computer disk drives and printer mechanisms and clog the filters and bearings of computer cooling fans.
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©2005, Richard M. Haney
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