Ho tloha ka 1991, k'hamphani ea rona e se e fumane lilemong tse fetang tse 30 indastering ea senotlolo. Ho ikhethela linthong tsa lisebelisoa tsa mochini le tsa lisebelisoa tsa motlakase, lisebelisoa tsa toptek li entsoe hampe le boleng. 'Me le feme ea bo-220 le feme ea mithara e 15,000, polokeho ea basebetsi, ea ho boloka IsO 4 4001:
Lihlahisoa tsa rona li latela litekanyetso tse thata, ho kenyeletsoa ANSI, BhMa, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, CE, K.2-2008 Gz, Skg, le UKCA. Re fana ka tšehetso ea mahlale le lits'ebeletso tsa boeletsi, li thusa bareki ka nts'etsopele ea sehlahisoa le tharollo ea tatellano. Setsebi sena se thehile hlooho e le moetapele indastering ea thekiso ea thekiso ea khoebo.