BS EN 17289-2-2020 Characterization of bulk materials一 Determination of a size-weighted fine fraction and crystalline silica content Part 2: Calculation method. This document specifies the determination of the sizeeighted fine fraction (SWFF) and the sizeweighted fine fraction of crystalline silica (SWFFCS) in bulk materials by calculation. The document also specifies the assumptions and preconditions to be fulfilled for this method to be valid. The purpose of this document is to allow users to evaluate bulk materials regarding their sizeweighted fine fraction and crystalline silica content. NOTE For preparation of the sample and determination of crystalline silica by X-ray Powder Diffractometry (XRD) or Fourier Transform Infrared Spectroscopy (FT-IR), see EN 17289-1. The calculation method is applicable only after experiments have shown that the results are accurate and consistently equal or higher than the results from sedimentation, as specified in EN 17289-3, for that particular bulk material. A specific method for the evaluation of the SWFF for diatomaceous earth bulk materials is given in Annex A. Due to the internal porosity of diatomaceous earth, the general instructions given in this document are adapted in order to take into account the material’s effective density. This document is applicable for crystalline silica containing bulk materials which have been fully investigated and validated for the evaluation of the size-weighted fine fraction and crystalline silica. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 481. Workplace atmospheres — Size fraction definitions for measurement of airborne particles EN 1540. Workplace exposure — Terminology EN 17289-1:2020, Characterization of bulk materials — Determination of a sizeweighted fine fraction and crystalline silica content — Part 1: General information and choice of test methods ISO 1183-1, Plastics — Methods for determining the density of non-cellular plastics — Part 1: Immersion method, liquid pycnometer method and titration ISO 13317-1, Determination of particle size distribution by gravitational liquid sedimentation methods — Part 1: General principles and guidelines ISO 133 17-2, Determination of particle size distribution by gravitational liquid sedimentation methods — Part 2: Fixed pipette method ISO 13320, Particle size analysis — Laser diffraction methods 3 Terms and definitions For the purposes of this document, the terms and definitions given in...
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