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.

Ingrédients de mélange du caoutchouc — Silice précipitée — Détermination de la distribution dimensionnelle par à disque centrifuge

General Information

• Status: Published
• Publication Date: 24-Oct-2019
• ICS: 83.040.20 - Rubber compounding ingredients
• Technical Committee: ISO/TC 45/SC 3 - Raw materials (including latex) for use in the rubber industry
• Drafting Committee: ISO/TC 45/SC 3/WG 3 - Carbon black, silica and rubber chemicals
• Current Stage: 9020 - International Standard under periodical review
• Start Date: 15-Jan-2024
• Completion Date: 15-Jan-2024

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 20927
First edition
2019-10
Rubber compounding ingredients —
Precipitated silica — Determination
of aggregate size distribution by disc
centrifuge
Ingrédients de mélange du caoutchouc — Silice précipitée —
Détermination de la distribution dimensionnelle par à disque
centrifuge
Reference number
ISO 20927:2019(E)
©
ISO 2019

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ISO 20927:2019(E)

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ii © ISO 2019 – All rights reserved

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ISO 20927:2019(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Significance and use . 1
5 Apparatus . 2
6 Reagents and materials . 2
7 Calibration of the test equipment . 3
7.1 Calibration of the ultrasonic device . 3
7.2 Routine alignment check . 3
8 Operating instructions . 3
8.1 Preparation of the disc centrifuge . 3
8.2 Sample preparation . 4
8.3 Cleaning the centrifuge . 5
9 Procedure. 5
10 Evaluation and documentation of the test results . 6
11 Precision data . 7
12 Safety precautions
...