Inventories of maintenance materials consist of raw materials and materials for the purpose of production and maintenance of semi-finished and finished products of the maintenance department. In 2016, the write-down of inventories to the net realisable value and recognised as an expense amounted to €11 million (€6 million in 2015). The cumulative impairment, after withdrawals, came to €94 million at the end of 2015 (€95 million in 2015).