What is Halogen Free PCB

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asked Feb 25, 2021 in H&E by MayNa (420 points)

Halogen free printed circuit board is called Halogen Free PCB. Halogen free PCB is made of halogen-free copper clad laminate. Halogen elements are extremely life-threatening chlorine, bromine, fluorine, iodine and very. For PCB to be considered “halogen-free”, the content of chlorine or bromine must be less than 900 ppm, and the total amount of halogen materials must be less than 1500 ppm.

Performance of Halogen Free PCB

  • Insulation: due to the substitution of halogen by P or N, the polarity of epoxy resin molecular bond is reduced, thus increasing the insulation resistance and breakdown voltage.
  • Water absorption: due to the relatively low electrons of N and P in nitrogen phosphorus reducing oxygen resin, the possibility of hydrogen atom bonding in water is lower than that of halogen. The water absorption of halogen free PCB is lower than that of conventional PCB, which affects the reliability to a certain extent.
  • Thermal stability: the content of nitrogen and phosphorus in Halogen free PCB is higher than that in common PCB, so the monomer molecular weight and TG value increase.

Under heating, the molecular mobility of halogen free PCB is lower than that of conventional epoxy resin board, so halogen free PCB has relatively low coefficient of thermal expansion (CTE).

 

Application of Halogen Free PCB

Since they are halogen-free, they can be used in any industry using PCB. The most important applications in industry are mobile and automotive, because we used to keep in touch with mobile phones, cars and other vehicles. If the PCB is halogen-free, we can be sure that it has less impact on our health.

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