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Halogen Free PCB

What is Halogen Free PCB

Introduction:

1.Halogen-Free PCB: There is increasing demand for environmentally friendly PCB electronic products. Halogenated compounds have been targeted for reduction and eventual elimination. As such, Halogen-Free PCBs are becoming more and more popular because they are constructed of materials that are free of halogen. In addition ,The dielectric constant, dissipation factor and moisture diffusivity of PCB materials that are described as Halogen-Free PCB are different from those employed in PCBs industry.

2. Halogen Free PCB Definition : According to IPC 4101B standards in the electronics industry that address Halogen-Free PCB:
Bromine must be below 900 PPM by weight.
Chlorine must be below 900 PPM by weight.
Combined Bromine + Chlorine must be below 1500 PPM by weight.

3. Halogen Free PCB Development : Concerns regarding the health and safety of halogenated flame retardants in PWB applications dates to the early 1990s, when it was discovered that under certain circumstances highly toxic dioxins and furans could be released during the (incomplete) combustion of PWBs that use brominated flame retardant. In many applications a halogenated material can provide the required product performance at a lower overall cost than Halogen-Free PCB materials. While it is not yet legislated that electronic component PCB suppliers must remove brominated and chlorinated flame retardants from their materials .

Panda PCB service our customers from prototype through mass production in Halogen-Free PCB, Now Halogen-Free PCB has recently been hot topic in the electronics industry due to increasing concern over environmental issues.In general as the term implies “Halogen-Free” means the product material that does not contain any compounds derived from halogen elements. Halogen-Free PCB has been undertaken by the electronics industry, known as the “Halogen-free Initiative.” Certain types of halogenated PCB materials have a detrimental effect on the environment as well as being toxic to humans and animals. Halogen-Free PCB does not alone indicate that a product enhances safety, health or is better environmentally for a given application.With regard to fire safety, the term “halogen-free” refers only to the toxicity of the smoke generated during combustion of a material. By its nature a halogen-free product will not release significant levels of toxic or corrosive gases when it is ignited.

Halogen-Free PCB Advantages:

Halogen-Free PCB properties that are of concern to the assembler are as good or better than comparable halogenated boards. By comparing data sheets from a number of raw PCB material suppliers, it is easy to see that the halogen-free PCB generally have lower CTE. They have longer T-260 and T-288 times and a higher Td temperature. These all mean that the board will be better suited for multiple reflow processes and will be able to withstand higher reflow temperatures in PCBA.

Halogen-Free PCB Applications:

 

In applications such as data centers and phone switching stations, telecom and mobile devices, and other areas where large concentrations of electronics exist, there is concern that the smoke from even a small fire could travel to other areas and damage or affect the performance of nearby equipment. In addition, Halogen free laminates also provide good performance in Pb-free soldering.
But,In many applications a halogenated material can provide the required product performance at a lower overall cost than halogen-free materials. Below 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