Jotta pylväät ja niiden sisällä olevat komponentit kestäisivät väkeviä suolahappoliuoksia, ne valmistetaan tavallisesti sopivista muovimateriaaleista (kuten fluoratuista hiilivetypolymeereistä) tai lasista tai vuorataan näillä materiaaleilla.
All collateralised operations involving the foreign reserve assets of the ECB comprising repurchase agreements, reverse repurchase agreements, buy/sell-back agreements and sell/buy-back agreements are to be documented under the following standard agreements, in such form as may be approved or amended by the ECB from time to time: for counterparties organised or incorporated under French law, theEurLex-2 EurLex-2