After learning this article , you can know PCB Laminate mate

2018-11-23 18:02Writer: qyadminReading:

     FR series (flame retardant)

  • FR-2: paper reinforced phenolic – Dark yellow, stable size

  • FR-3: paper reinforced epoxy

  – Light beige, good electrical properties, suitable for hole

  plating

  • FR-4: wowen glass reinforced epoxi

  – Transparent yellwish-green, good machinable, plateable,

  minimal water absorption

  • FR-5: similar to FR-4, better heat resistance, higher Tg

  • CEM 1: paper and glass reinforced epoxy: cheaper

  • CEM 3: wowen and non-wowen glass reinforced epoxy


Properties FR-3 FR-4 FR-5
Rbulk, Ωcm (40oC) 4 1012 8.1014 8.1014
R , Ω (40oC) 4 1012 3 1012 3 1015
εrel, (1 MHz) 4,9 4,7 4,6
tgδ (1 MHz) (GHz) 0,04 0,02 0,015
Tolerance of the solder
baath (sec)
25 >120 >120
Water absorption  (mg) na 15 na
Tg, glass transition
temperature
  150 >165
Thermal expansion
coefficient (z axis %)
25-275°C
  5.5  
 
 
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