Automotive Component Cleanliness Testing

What Liquid Is Used for Technical Cleanliness Extraction?   Quick Summary In technical cleanliness testing per ISO 16232 and VDA 19.1, extraction liquid is used to elute particulate contaminants from component surfaces. Selection of extraction liquid directly determines particle recovery efficiency and test accuracy. No universal extraction medium exists; selection shall be made comprehensively based on component material, contaminant type and extraction method. Applicability verification including blank test and particle spike recovery test is mandatory after medium selection.   1 Classification of Common Extraction Liquids 1.1 Aqueous neutral extraction liquid (containing non-ionic surfactants) Based on deionized water, suitable for water-based emulsions, water-soluble rust pre...