Daidaitaccen ɗaki mai tsabta

A cikin Amurka, har zuwa ƙarshen Nuwamba 2001, an yi amfani da daidaitattun 209E na tarayya (FED-STD-209E) don ayyana buƙatun don ɗakuna masu tsabta. A ranar 29 ga Nuwamba, 2001, an maye gurbin waɗannan ƙa'idodin ta hanyar buga ƙayyadaddun ISO 14644-1. Yawanci, ɗaki mai tsabta da ake amfani da shi don masana'antu ko binciken kimiyya yanayi ne mai sarrafawa tare da ƙananan matakan gurɓatawa, kamar ƙura, ƙananan ƙwayoyin cuta, ƙwayoyin iska, da tururin sinadarai. Don zama madaidaici, ɗakin tsafta yana da matakin gurɓatawa mai sarrafawa, wanda aka ƙayyade ta adadin barbashi a kowace mita cubic a ƙayyadadden girman ƙwayar. A cikin yanayin birni na yau da kullun, iska ta waje ta ƙunshi barbashi miliyan 35 a kowace mita cubic, 0.5 microns a diamita ko mafi girma, daidai da ɗaki mai tsabta na ISO 9 a matakin mafi ƙanƙanci na daidaitattun ɗaki mai tsabta. An rarraba ɗakuna masu tsabta bisa ga tsabtar iska. A Matsayin Tarayyar Amurka 209 (A zuwa D), ana auna adadin barbashi daidai ko sama da 0.5mm a cikin ƙafar cubic 1 na iska, kuma ana amfani da wannan ƙidayar don rarraba ɗakuna masu tsabta. Hakanan ana karɓar wannan ma'auni na ma'auni ta sabon sigar 209E na daidaitattun. Kasar Sin tana amfani da ma'aunin tarayya na 209E. Sabon ma'auni shine TC 209 na Ƙungiyar Ƙididdiga ta Duniya. Dukansu ƙa'idodi sun rarraba ɗakuna masu tsabta bisa adadin barbashi a cikin iska na dakin gwaje-gwaje. Matsayin tsaftataccen ɗaki FS 209E da ISO 14644-1 suna buƙatar takamaiman ma'auni da ƙididdiga don rarraba matakin tsabta na ɗaki mai tsabta ko yanki mai tsabta. A cikin Ƙasar Ingila, ana amfani da Standard 5295 don rarraba ɗakuna masu tsabta. Ba da daɗewa ba za a maye gurbin wannan ma'aunin da BS EN ISO 14644-1. Ana rarraba ɗakuna masu tsabta bisa ga lamba da girman ɓangarorin da aka ba su izinin kowace ƙarar iska. Lambobi masu girma kamar "Class 100" ko "Class 1000" suna nufin FED_STD209E, wakiltar adadin barbashi na 0.5 mm ko girman girman da aka yarda da kowace ƙafar cubic na iska.