ISO 20927:2019
Rubber compounding ingredients — Precipitated silica — Determination of aggregate size distribution by disc centrifuge
This document specifies a general method for determining the aggregate size distribution (ASD) of silica by using a disc centrifuge according to the principle of sedimentation. As pre-stage the silica is de-agglomerated in water using strong ultrasonic power treatment.
The method is used for precipitated silica.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Significance and use
5 Apparatus
6 Reagents and materials
7 Calibration of the test equipment
7.1 Calibration of the ultrasonic device
7.2 Routine alignment check
8 Operating instructions
8.1 Preparation of the disc centrifuge
8.2 Sample preparation
8.3 Cleaning the centrifuge
9 Procedure
10 Evaluation and documentation of the test results
11 Precision data
12 Safety precautions
Annex A (informative) Physical principles of measurement
Annex B (informative) Precision data
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Significance and use
5 Apparatus
6 Reagents and materials
7 Calibration of the test equipment
7.1 Calibration of the ultrasonic device
7.2 Routine alignment check
8 Operating instructions
8.1 Preparation of the disc centrifuge
8.2 Sample preparation
8.3 Cleaning the centrifuge
9 Procedure
10 Evaluation and documentation of the test results
11 Precision data
12 Safety precautions
Annex A (informative) Physical principles of measurement
Annex B (informative) Precision data
Bibliography