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In connection with the use of chemically unstable gases (especially acetylene and ethylene oxide) accidents keep on happening - amongst them also quite serious ones. These gases are known to be chemically unstable. A chemically unstable sas is a flammable gas that is able to react exolosivelv even in the absence of air or oxveen. The investigation of accidents showed that the Chemical instability of flammable gases played an important role in the severity of accidents. Therefore, this hazardous property was included in the global harmonizatiön of the Classification of Chemicals. The Classification of chemically unstable flammable gases and mixtures is an amendment to Chapter 2.2 “Flammable gases” of the UN Globally Harmonized System of Classification and Labelling of Chemicals (GHS), because most chemically unstable gases are flammable as well. The proposal to add them to the GHS originated from the experts of an informal working group of the UN Sub-Committee of Expert on the GHS (UNSCEGHS) headed by BAM, Germany. The UNSCEGHS has decided to include it in the Fourth Revised Edition of the GHS. The respective method for determining whether a gas is chemically unstable or not, is included in the UN Manual of Tests and Criteria. This paper presents some experimental investigations of these gases, the test methods, examples of new classifications and results from CHEMSAFE
Länderübergreifende und vereinheitlichte Kriterien zur Einstufung von gefährlichen Chemikalien und zu ihrer Gefahrenkommunikation sind ein wichtiges Element für die Sicherheit im Umgang mit Gefahrstoffen. Das globale System zur Einstufung und Kennzeichnung von Chemikalien – das Globally Harmonized System der Vereinten Nationen (UN) – oder kurz GHS – unterstützt dieses Anliegen und hat auch Eingang in die europäischen Rechtsvorschriften gefunden. Die Vereinten Nationen (UN) haben sich nunmehr einiger systematischer Probleme im GHS angenommen und verändern in diesem Zuge auch das Einstufungssystem für Explosivstoffe. Die Fachdiskussionen im Kreis der Experten bei UN sind komplex und nicht leicht zu verfolgen. Es soll daher hier ein Zwischenstand über die bislang vorliegenden Ergebnisse der damit befassten Arbeitsgruppen dargestellt werden.
One of the fundamental principles of the UN-GHS (Globally Harmonized System of Classification and Labelling of Chemicals) is that all hazards of a chemical should be assigned and communicated. There is no general prioritization of hazards in the sense that certain hazard classes are not applicable if another one has been assigned. In contrast to health and environmental hazards, there are physical or chemical factors which preclude certain combinations of physical hazard classes. So far, there is no common understanding as to which combinations are relevant and which not. For example, should a pyrophoric liquid be classified as flammable liquid in addition, or is this redundant and unnecessary? In the course of the implementation of the GHS by countries or sectors and the actual application by industry all over the world, such questions become more and more important. For many of the combinations an unambiguous decision based on theGHS alone is not possible, thus confirming that the question which physical hazard classes might be assigned simultaneously to a chemical is not trivial. As one more milestone on the path to a globally harmonized system for the classification of hazardous chemicals, this should be discussed and ultimately solved on a global basis. It is the hope that this presentaion might serve as an impetus for such discussions.