BS ISO 248-2:2019
$102.76
Rubber, raw. Determination of volatile-matter content – Thermogravimetric methods using an automatic analyser with an infrared drying unit
| Published By | Publication Date | Number of Pages |
| BSI | 2019 | 18 |
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.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 6 | Foreword |
| 7 | 1 Scope 2 Normative references 3 Terms and definitions |
| 8 | 4 Principle 5 Reagents 6 Apparatus 6.1 Automatic analyser 7 Sampling and preparation of test portion |
| 9 | 8 Procedure 8.1 General 8.2 Determination of endpoints for method A and method B |
| 10 | 8.3 Method A (pre-defined drying time method) |
| 11 | 8.4 Method B (in which drying ends when the mass loss rate has decreased to a pre-defined level) 8.5 Calculation of volatile-matter content |
| 12 | 9 Precision 10 Test report |
| 13 | Annex A (informative) Examples of test conditions |
| 14 | Annex B (informative) Precision data |
| 16 | Bibliography |
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BS ISO 248-2:2019 – TC:2020 Edition
Tracked Changes. Rubber, raw. Determination of volatile-matter content – Thermogravimetric methods using an automatic analyser…
