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Sometimes the object that has to be analysed cannot be transferred to a laboratory or is too big to be analysed without destroying it. Examples for that are e.g. hazes and discolouration of yacht coatings or aircrafts (see Chapter 3.8 “Field analysis” in Part III) or coating/surface failures of big buildings. Machine parts, transport devices or storage containers are further examples that challenge the way sampling can be performed.

If a non-destructive sample of a failure area is needed, wipe sampling is a choice. The material needed for this kind of sampling are:

 clean laboratory grade tissue

 appropriate analytical grade solvents

 clean laboratory grade glass container

 laboratory grade disposable gloves

Figure II.12: Wipe sampling a high-quality exterior coat of a ship