DIN ISO 16000-27:2012-12

This International Standard specifies a method giving an index for the numerical concentration of fibrous structures with fibres equal or greater than 0,2 µm in diameter in settled dust on surfaces and their classification into specific substance groups (e. g. chrysotile, amphibole asbestos, other inorganic fibres). It is primarily applicable for indoor areas, but it is also suitable for certain outdoor situations. The standard is based on the procedures described in VDI 3877 Part 1. A sampling technique for collection of settled dust using adhesive tape is described. The method incorporates an analytical method for evaluation of the collected samples by scanning electron microscopy. The result can be specified in asbestos structure per unit area and/or classified in four different loading classes. The analytical sensitivity depends on the method used and may be as low as 10 structures/cm2. For the purpose of this International Standard an asbestos or fibrous structure is defined as an asbestos or (other inorganic/organic) fibre-containing particle regardless of its diameter. The method may also be used for the determination of surface contamination of other fibrous structures like man-made mineral vitreous fibres.