16 Hazardous substances basics Table 2: HSG71 – Segregation Table incorporating GHS Symbols Please observe local legislation and regulations. Segregation may not be necessary Segregation may not be necessary, but consult suppliers about requirements for individual substances. In particular, note that some types of chemicals within the same class, particularly Class 8 corrosives, may react violently, generate a lot of heat if mixed or evolve toxic fumes. Segregate from These combinations should not be kept in the same building compartment or outdoor storage compound. Compartment walls should be imperforate, of at least 30 minutes fire resistance and sufficiently durable to withstand normal wear and tear. Brick or concrete construction is recommended. An alternative is to provide separate outdoor storage compartments with an adequate space between them. Keep apart Separate packages by at least 3 m in the storeroom or storage area outdoors. Materials in non-combustible packaging that are not dangerous substances and that present a low fire standard of separation should be regarded as a minimum between substances known to react together readily, if that reaction would increase the danger of an escalating incident. Segregate from or keep apart The lower standard refers to the outside storage of gas cylinders. Where non-liquefied flammable gases are concerned, the 3 m separation distance may be reduced to 1 m. Isolate This is used for organic peroxides, for which dedicated buildings are recommended. Alternatively, some peroxides may be stored outside in fire-resisting secure cabinets. In either case, adequate separation from other buildings and boundaries is required. CLASS 1 2 3 4 5 6 8 Chemical Segregation By Chemical Group. Explosive Compressed gases Flammable liquids Flammable solids Oxidising substances Toxic Corrosive 1 EXPLOSIVE 2 FLAMMABLE GAS TOXIC GAS FLAMMABLE LIQUID FLAMMABLE SOLID Spontaneously combustible Oxididing substance TOXIC 6 CORROSIVE 1 EXPLOSIVE 1.0 Explosive 2 FLAMMABLE GAS TOXIC GAS FLAMMABLE LIQUID FLAMMABLE SOLID Spontaneously combustible Oxididing substance TOXIC 6 CORROSIVE 2.1 Flammable 2.2 Non Toxic Non flammable 2.3 Toxic 4.1 Readily combustible 4.1 Spontaneously combustible 4.3 Dangerous when wet 5.1 Oxidising substance 5.2 Organic peroxide Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Keep Apart Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form ISOLATE Keep Apart Keep Apart Keep Apart Keep Apart Keep Apart Segregation may not be necessary Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate Form Segregate form or Keep Apart Segregation may not be necessary Segregation may not be necessary Segregation may not be necessary Keep Apart Segregate form or Keep Apart Keep Apart Keep Apart Keep Apart Segregation may not be necessary Segregation may not be necessary Keep Apart Keep Apart Keep Apart ISOLATE Keep Apart Keep Apart Segregation may not be necessary Keep Apart Keep Apart Keep Apart Keep Apart Segregation may not be necessary Keep Apart Keep Apart ISOLATE Keep Apart Keep Apart Segregation may not be necessary Keep Apart Keep Apart Keep Apart Segregation may not be necessary Segregation may not be necessary Segregation may not be necessary Segregation may not be necessary Keep Apart Keep Apart Keep Apart ISOLATE ISOLATE ISOLATE Keep Apart Keep Apart Keep Apart Segregation may not be necessary Segregation may not be necessary Keep Apart Keep Apart Keep Apart Segregation may not be necessary Keep Apart Keep Apart Segregation may not be necessary Segregation may not be necessary Keep Apart Keep Apart Segregation may not be necessary Keep Apart Segregation may not be necessary Keep Apart Keep Apart Keep Apart Keep Apart Segregation may not be necessary Segregate Form Keep Apart Segregate form or Keep Apart ISOLATE
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