FR4 PCB yog cov khoom siv tseem ceeb heev thiab tseem ceeb hauv kev lag luam hluav taws xob. Nws lub npe tag nrho yog iav fiber reinforced epoxy resin tooj liab clad laminate.
Cov khoom siv FR4 muaj cov khoom siv hluav taws xob zoo heev, muaj txiaj ntsig zoo cais qhov sib txawv ntawm lub voj voog thiab tiv thaiv kev luv luv. Nyob rau tib lub sijhawm, nws kuj muaj lub zog zoo txhua yam, muaj peev xwm tiv taus qee yam kev cuam tshuam sab nraud thiab kev co, ua kom muaj kev ruaj ntseg thiab kev ntseeg siab ntawm lub rooj tsav xwm Circuit Court. Tsis tas li ntawd, FR4 PCB muaj cov cua kub zoo heev, tswj kev ua haujlwm ruaj khov nyob rau hauv siab - qhov kub thiab txias thiab tsis yooj yim deformed lossis puas.