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This European Standard specifies requirements on thermal shock resistance as well as heating and cooling procedures of standardised glass-lined apparatus, components, accessories, and glass-lined pipes primarily used for process equipment in chemical plants. It specifies the limits of thermal shock resistance using diagrams (see Figure 1 and Figure 2). For glass-lined steel, a difference is made between a thermal shock on the glass-lined side (by charging an apparatus) versus a thermal shock on the steel side (by heating and cooling an apparatus). This European Standard applies to operating temperatures from - 25 °C to + 230 °C. This European Standard is only applicable to enamelled unalloyed and low-alloy carbon steels.