Abstract
The paper describes the work carried out in the preparation of a ‘natural’ contaminant of a definite and reproducible composition for use in tests on oil filters. The arbitrary limits set in the specification of the contaminant are based on various factors from data on used oil filters and previous knowledge gained in the examination of used engine oils
The preparation of the contaminant from the raw material is described in detail, and reference is made to a method of testing filters which is used to make sure that the standard contaminant affects a filter in a consistent manner. Detailed methods of chemical analysis for inorganic constituents and particle size measurement are given in the appendixes to the paper
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