National foreword<br>National Annex NA (informative) - Bibliography<br>Foreword<br>European foreword<br>1 Scope<br>2 Normative references<br>3 Terms and definitions<br>4 Principle<br>5 Apparatus<br>6 Sample preparation<br>7 Procedure<br>8 Calculation<br>9 Performance characteristics<br>10 Test report<br>Annex A (normative) - Determination of the median<br> value of a particle size distribution<br>Annex B (informative) - Guidance data on<br> performance characteristics.<br>Bibliography