Copper pas nrig yog ib hom uas tsis yog-ferrous hlau ua pas nrig, uas muaj zog ntau lawm thiab kev ua tau zoo thiab siab conductivity. Feem ntau muab faib ua tooj dag rods (tooj liab-zinc alloy, pheej yig dua), tooj liab rods (kwv yees cov ntsiab lus tooj liab).
Lub voj voog dav dav ntawm cov pas nrig tooj liab yog li 24 hnub. Feem ntau muab faib ua tooj dag rods thiab tooj liab rods. Copper rods yog cov khoom zoo li tus pas nrig ua los ntawm cov hlau alloy ntawm tooj liab thiab zinc, npe rau lawv cov xim daj. Brass nrog cov ntsiab lus tooj liab ntawm 56 feem pua ~ 68 feem pua tau melting point ntawm 934 ~ 967 degrees. Copper rods muaj cov cuab yeej zoo thiab hnav tsis kam, thiab tuaj yeem siv los tsim cov cuab yeej precision, qhov chaw ntawm cov nkoj, plhaub casings ntawm phom, thiab lwm yam.