Kuyambira 1958, kuchuluka kwa malonda a Bingu, mtundu wa mphezi wotentha magalasi insulator wadutsa zidutswa 100 miliyoni, zomwe zimawerengera theka la dzikolo ndi gawo limodzi mwa magawo asanu ndi limodzi a dziko lapansi.
Glass Insulator imapangidwa ndi kapu yachitsulo, mbali zagalasi zolimba ndi pini yachitsulo, zomwe zimaphatikizidwa ndi zomatira simenti.Musanayambe kusonkhanitsa, pamwamba pa pini yachitsulo imaperekedwa ndi gasket yofewa, mkati mwa kapu yachitsulo ndi pini imathera pa malo okhudzana ndi zomatira za simenti zimakutidwa ndi phula.Ma gasket ndi phula amagwiritsidwa ntchito kugwedezeka ngati chiwonongeko chikayang'anizana ndi kukula ndi kutsika kwamafuta.Zigawo zagalasi zolimba zimagwiritsidwa ntchito kuyika insulate.
Ma Insulators a Galasi ali ndi mawonekedwe ang'onoting'ono, kulemera kopepuka, kudzipuntha kwa zero, komanso kuzindikira kosavuta;mkulu makina mphamvu;kukana bwino kwa arc;ntchito yabwino yodziyeretsa komanso yosavuta kukalamba.Kuphatikiza apo, kupopera mbewu mankhwalawa kuli ndi zabwino zamphamvu za hydrophobicity, kukana kwanthawi yayitali kuipitsidwa, kutsika pang'ono kwaposachedwa pamtunda, komanso kusamalidwa kopanda ntchito;amagwiritsidwa ntchito kwambiri m'madera osiyanasiyana kunyumba ndi kunja.
Ma Disk kuyimitsidwa magalasi insulators amagawidwa mu Standard Type, Anti-pollution Type, DC mtundu, Aerodynamic Type, Out-nthiti Type ndi Ground Wire Type.
