The document discusses internal finishes, durability, and maintainability for cleanroom installations based on ISO 14644-4. It recommends that internal surfaces be smooth, non-porous, free of cracks and ledges to facilitate effective cleaning. Material selections should consider lifecycle costs, contamination risks, and be compatible with cleaning/disinfection methods while minimizing corners and crevices where contamination could collect. Regular maintenance procedures and repairs are necessary to retain cleanliness class performance over time.
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International Standard ISO 14644-4-E1.4
1. INTERNATIONAL STANDARD ISO 14644-4 First edition2001-04-01
E.1.4 Internal finishes,durabilityandmaintainabilityIn the completedinstallation,all internal
surfaces shouldbe finishedsuitablysmooth,non-porous and free from cracks, cavities,stepsand
ledges.The designand construction shouldbe such that the number of steps,ledges,cavitiesand
similarfeatureswhere contaminationcould collectis minimized.The numberof corners should
also be kept to a minimum,particularly internal corners. Cornersand junctionsmay be radiused,
especiallyat floor-to-wall andwall-to-wall junctions,sothat effective cleaning isfacilitated.The
finishshouldbe compatible withthe mechanical and chemical effectsofthe intendedmethodsof
cleaningand disinfection.Materialsusedfor internal finishesshouldbe maintainedto ensure that
they consistentlyretainthe performance qualitiesconsistentwiththe cleanlinessclassofthe
installation.This may require regular maintenance proceduresand repairs. Considerationof
maintenance and repair methodsand disruptionimpact shouldform part of the material selection
criteria. Full lifecycle costand contamination risk analysisprocedures shouldbe considered.