Definition of Halogen Free PCB
According to the JPCA-ES-01-2003 standard: Copper clad laminates with chlorine (C1) and bromine (Br) content less than 0.09% Wt (weight ratio) are defined as halogen-free copper clad laminates. (At the same time, the total amount of CI+Br≤0.15%[1500PPM])
Why We Use Halogen Free PCB
Studies by related institutions have shown that halogen-containing flame retardant materials will emit dioxins, benzofurans, etc. when they are discarded and burned. They emit large amounts of smoke, have unpleasant smells, highly toxic gases, and cause cancer. They cannot be discharged after ingestion. Environmental protection affects human health. Therefore, the European Union initiated the prohibition of using PBB and PBDE as flame retardants in electronic information products. Therefore, halogen-free circuit boards are introduced on the market.
Features Of Halogen Free PCB
Improving material insulation:
Due to the use of P or N to replace the halogen atoms, the polarity of the molecular bond segment of the epoxy resin is reduced to a certain extent, thereby improving the qualitative insulation resistance and resistance to breakdown.
Thermal stability of materials:
The content of nitrogen and phosphorus in the halogen-free sheet material is greater than the halogen content of ordinary halogen-based materials, so its monomer molecular weight and Tg value have increased. When heated, its molecular mobility will be lower than that of conventional epoxy resins, so the coefficient of thermal expansion of halogen-free materials is relatively small.
Having the lower CTE:
Compared with traditional FR4, high TG FR4 materials, halogen-free PCB has a lower coefficient of thermal expansion (CTE).
Application Of Halogen Free PCB
（1）Substation.
（2）Power Station.
（3）Electrical Distribution Facilities.
（4）Outdoor electrical work etc...
Below are main Halogen Free Materials we used:
| Halogen Free materials |
TG/TD |
Features |
| S1155 |
140/370 |
Low emitting of smoke and odors in combustion, No emitting of poisonous gas and no residue of harmful constituents. Constituents free of halogen, Antimony, Red phosphorus, and etc. Flammability UL 94 V-0 |
| S1165 (High TG) |
170/370 |
Low emitting of smoke and odors in combustion, No emitting of poisonous gas and no residue of harmful constituents. Constituents free of halogen, Antimony, Red phosphorus, and etc. Flammability UL 94 V-0 |
