4J36, wanda kuma aka sani da Invar 36 alloy, na musamman ne, ƙananan ƙananan ƙarfe-nickel alloy tare da ƙananan ƙananan ƙananan haɓaka (CTE); yana da ƙarancin mizani na faɗaɗawar thermal a cikin kewayon 20-100 ° C. 4J42 alloy yana da madaidaicin ƙididdigewa na haɓakawar thermal (CTE) wanda yayi daidai da na gilashin wuya, gilashin taushi, da yumbu.

Alloy 4J42 ne baƙin ƙarfe-nickel gami tare da m coefficient na fadada, da coefficient na thermal fadada (CTE) matches na wuya gilashin, taushi gilashin, yumbu, kuma za a iya hermetically shãfe haske ta hanyar gilashin-to-karfe sealing tsari don cimma hermetically shãfe haske marufi gidaje; CTE ƙulli na alumina da aka saba amfani da su, LTCC mai oxidative, da na'urorin kewayawa na AlN; jimlar ƙarfin maganadisu da kyawawan kaddarorin lantarki; da kyau machining, plating, da soldering Properties.