ISO 248-2:2019

Rubber, raw — Determination of volatile-matter content — Part 2: Thermogravimetric methods using an automatic analyser with an infrared drying unit

1.1 This document specifies two thermogravimetric methods for the determination of moisture and other volatile-matter content in raw rubbers by using an automatic analyser with an infrared drying unit. 1.2 These methods are applicable to the determination of volatile-matter content in synthetic rubbers (SBR, NBR, BR, IR, CR, IIR, halogenated IIR and EPDM) listed in ISO 1629 and to various forms of raw rubber, such as bale, block, chip, pellet, crumb, powder and sheet. These methods might also be applicable to other raw rubbers only when the change in mass is proven to be due solely to loss of original volatile matter and not to rubber degradation. 1.3 The methods are not applicable to raw rubbers which need homogenizing as specified in ISO 1795. 1.4 The hot-mill method and the oven method specified in ISO 248‑1 and the methods specified in this document might not give identical results. In cases of dispute, therefore, the oven method, procedure A, specified in ISO 248‑1:2011, is the referee method. NOTE These methods can be useful for routine determinations, e.g. quality control, when the measurement conditions for the automatic analyser are fixed for a particular raw rubber or grade of raw rubber.

Caoutchouc brut — Détermination des matières volatiles — Partie 2: Méthodes thermogravimétriques utilisant un analyseur automatique avec une unité de séchage infrarouge

General Information

• Status: Published
• Publication Date: 25-Mar-2019
• ICS: 83.040.10 - Latex and raw rubber
• 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 5 - Synthetic and reclaimed rubber
• Current Stage: 9020 - International Standard under periodical review
• Start Date: 15-Jan-2024
• Completion Date: 15-Jan-2024

Relations

• Revises: ISO 248-2:2012 - Rubber, raw — Determination of volatile-matter content — Part 2: Thermogravimetric methods using an automatic analyser with an infrared drying unit
• Effective Date: 31-Mar-2018

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 248-2
Second edition
2019-03
Rubber, raw — Determination of
volatile-matter content —
Part 2:
Thermogravimetric methods using an
automatic analyser with an infrared
drying unit
Caoutchouc brut — Détermination des matières volatiles —
Partie 2: Méthodes thermogravimétriques utilisant un analyseur
automatique avec une unité de séchage infrarouge
Reference number
ISO 248-2:2019(E)
©
ISO 2019

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ISO 248-2:2019(E)

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ii © ISO 2019 – All rights reserved

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ISO 248-2:2019(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Reagents . 2
6 Apparatus . 2
6.1 Automatic analyser . 2
7 Sampling and preparation of test portion . 2
8 Procedure. 3
8.1 General . 3
8.2 Determination of endpoints for method A and method B . 3
8.3 Method A (pre-defined drying time method) . 4
8.4 Method B (in which drying ends when the mass loss rate has decreased to a pre-
defined level) . 5
8.5 Calculation of volatile-matter content . 5
9 Precision . 6
10 Test report . 6
Annex A (informative) Examples of test conditions .
...