Investor Presentaiton

General characteristics about the salt extraction process Introduction General Characteristics: Salt Extraction Process • • Process: Rock salt mining by underground dissolution Number of wells: 35 (vertical and directional wells) Depth: 900 to 1,200 meters Cemented coating -95/8" 1100m 7" Protection fluid • • Licensing: with ANM¹ and IMA², according to Brazilian regulation Status: Braskem decided to definitively end rock salt extraction activities in the region of the neighborhoods affected by the geological phenomenon Source: Braskem. Note (1): ANM: National Mining Agency. Note (2): IMA: Institute for the Environment. Salt 41/2 Water Brine 1170m Brine 1195m Insoluble 1200m The water dissolves the salt, thus forming the brine, which occupies the space previously occupied by the salt. The pressure of the inserted water forces the excess brine to rise over the surface. PUBLIC Braskem 62

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