Oil samples should not be in contact with which material?

Oil samples should not be in contact with plastic because certain types of plastic can adsorb or leach chemicals that may alter the composition of the oil sample. This interaction can lead to contamination of the sample, rendering it unreliable for analysis.

Metal, glass, and ceramic materials are generally considered inert and do not react with or absorb the substances in oil samples, making them more suitable for sample collection and storage. Using glass, for instance, provides a non-reactive environment that helps maintain the integrity of the sample. Metal can also be suitable, but care must be taken to ensure that it does not oxidize or otherwise react with the sample. Therefore, plastic containers should be avoided to ensure accurate and reliable test results for oil analysis.