Kuyeretsa chipinda chokhazikika

Ku United States, mpaka kumapeto kwa November 2001, Federal Standard 209E (FED-STD-209E) inagwiritsidwa ntchito kufotokoza zofunikira pazipinda zaukhondo. Pa November 29, 2001, miyezo imeneyi inasinthidwa ndi kusindikizidwa kwa ISO Specification 14644-1. Nthawi zambiri, chipinda choyera chomwe chimagwiritsidwa ntchito popanga kapena kafukufuku wasayansi ndi malo olamulidwa omwe ali ndi zonyansa zochepa, monga fumbi, tizilombo tating'onoting'ono ta mpweya, tinthu tating'onoting'ono, ndi nthunzi wamankhwala. Kunena zowona, chipinda choyeretsera chimakhala ndi mulingo woyipitsidwa woyendetsedwa, womwe umanenedwa ndi kuchuluka kwa tinthu tating'ono pa kiyubiki mita pamlingo wina wa tinthu. M'malo amtawuni, mpweya wakunja uli ndi tinthu 35 miliyoni pa kiyubiki mita imodzi, ma microns 0.5 m'mimba mwake kapena kukulirapo, molingana ndi chipinda choyera cha ISO 9 pamlingo wotsikitsitsa wa chipinda choyera. Zipinda zoyera zimagawidwa molingana ndi ukhondo wa mpweya. Ku US Federal Standard 209 (A mpaka D), kuchuluka kwa tinthu ting'onoting'ono tofanana kapena kupitilira 0.5mm timayezedwa mu kiyubiki futi imodzi ya mpweya, ndipo chiwerengerochi chimagwiritsidwa ntchito kuyika zipinda zoyera. Metric nomenclature iyi imavomerezedwanso ndi mtundu waposachedwa wa 209E wa muyezo. China imagwiritsa ntchito Federal Standard 209E. Muyezo watsopano ndi International Standards Organisation's TC 209. Miyezo yonseyi imayika zipinda zoyera potengera kuchuluka kwa tinthu tating'ono ta mpweya wa labotale. Miyezo yamagulu a zipinda zoyera FS 209E ndi ISO 14644-1 imafunikira miyeso yowerengera ya tinthu tating'ono ndi mawerengedwe kuti agawire ukhondo wa chipinda choyera kapena malo aukhondo. Ku United Kingdom, British Standard 5295 imagwiritsidwa ntchito kugawa zipinda zoyera. Mulingo uwu usinthidwa posachedwa ndi BS EN ISO 14644-1. Zipinda zoyera zimagawidwa molingana ndi kuchuluka ndi kukula kwa tinthu tating'onoting'ono tololedwa pa voliyumu ya mpweya. Ziwerengero zazikulu ngati "Class 100" kapena "Class 1000" zimatanthawuza FED_STD209E, kuyimira chiwerengero cha tinthu ting'onoting'ono tokwana 0.5 mm kapena kukulirapo komwe kumaloledwa pa kiyubiki mita imodzi ya mpweya.