ISO 20927:2019 PDF

Name: ISO 20927:2019 — Rubber compounding ingredients — Precipitated silica — Determination of aggregate size distribution by disc centrifuge
SKU: ISO 20927:2019
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Rubber compounding ingredients — Precipitated silica — Determination of aggregate size distribution by disc centrifuge

Название (английский):

ISO 20927:2019

Rubber compounding ingredients — Precipitated silica — Determination of aggregate size distribution by disc centrifuge

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 14
Дата публикации:: 25 октября 2019 г.
Издание:: ISO IS 20927 edition 1 version 1
ICS:: 83.040.20

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Описание (английский):

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.

Abstract

Похожие стандарты

Другие стандарты ISO

Overview

ISO 20927:2019 specifies a standardized laboratory method to determine the aggregate size distribution (ASD) of precipitated silica using a disc centrifuge based on the principle of sedimentation. The procedure requires pre-treatment by strong ultrasonic de‑agglomeration in water, followed by sedimentation in a sucrose density gradient. The method supports characterization and inter-laboratory comparison of silica used as rubber compounding ingredients.

Key topics and requirements

Scope & principle: Measurement of silica ASD by disc centrifuge photosedimentometry after ultrasonic dispersion; typical measurable range ~5 nm to 100 µm.

Apparatus: Disc centrifuge (typical speeds up to 24 000 r/min, commonly 20 000–24 000 r/min for fine silica); probe‑type sonicator (recommended nominal power ≥ 200 W, probe ≈ ½"); cooling bath, precision balance, syringes, rolled‑rim bottles.

Sample preparation: Example procedure - 0.60 g ± 0.05 g silica in 20 ml de‑ionized water (30 g/L); grind granular silica before dispersion to avoid flotation.

Ultrasonic calibration: Calibrate/verify ultrasonic energy input using the IRM 100 silica standard (ASTM D5900) to control probe ageing and ensure reproducible de‑agglomeration.

Density gradient: Sucrose gradient prepared from 8 % to 24 % w/w in 10 levels (1.8 ml per level) or by mixing two solutions (24 % and 8 %) per provided table; cap with 0.5 ml dodecane; allow stabilization (recommended ≥ 30 min).

Calibration standard: Use a narrow‑distribution PVC latex standard (~220 nm ± 20 nm) to set parameters used in Stokes‑law calculations and to correct for instrument and gradient variables.

Quality & precision: Routine alignment checks with standards (IRM 100/PVC) and monitoring of baseline/peak stability are recommended; safety precautions and precision data are included in the standard.

Applications and users

Who uses it: QC laboratories, R&D and product development teams in the rubber and elastomers industry, silica manufacturers, instrument laboratories performing particle sizing.

Why it matters: ASD of precipitated silica influences filler performance in rubber compounding (processing, reinforcement, dynamic properties). Standardizing dispersion, centrifuge conditions, and calibration enables reliable comparison of ASD results across batches and labs.

Practical outcomes: Enables material specification, supplier qualification, troubleshooting of compounding performance, and consistent QC protocols.

Related standards

ASTM D5900 referenced for the IRM 100 silica standard (used here as an example calibration material).

ISO 20927 complements other particle sizing and filler characterization methods; consult laboratory best practices and instrument-specific manuals for implementation details.

Keywords: ISO 20927:2019, precipitated silica, aggregate size distribution, disc centrifuge, ultrasonic dispersion, sucrose gradient, IRM 100, PVC calibration, rubber compounding.

ISO 20927:2019 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and users

Related standards

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