This standard describes a physical method of quantitative analysis. The method may be used to analyze mixtures of fibres that differ in density by at least 0.15 g/mL. The method may also be used when chemical methods of analysis are not suitable. The solvents used must not change the density of fibres.

The accuracy of the method depends upon sufficient difference in density of the two types of fibres and on the length of the fibres in the specimen being short enough to prevent tangling in the flotation solvent. Careful technique is also necessary if reliable results are to be obtained.

This standard may require the use of materials and/or equipment that could be hazardous. This document does not purport to address all the safety aspects associated with its use. Anyone using this standard has the responsibility to consult the appropriate authorities and to establish appropriate health and safety practices in conjunction with any existing applicable regulatory requirements prior to its use.