ISO 248-2:2019
(Main)Rubber, raw — Determination of volatile-matter content — Part 2: Thermogravimetric methods using an automatic analyser with an infrared drying unit
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
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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
---------------------- Page: 1 ----------------------
ISO 248-2:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
---------------------- Page: 2 ----------------------
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 .
...
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
---------------------- Page: 1 ----------------------
ISO 248-2:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
---------------------- Page: 2 ----------------------
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 .
...
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