What is a Halogen Free printed circuit board?In order to meet the requirements of halogen-free PCB, the content of halogen in the printed circuit board should not exceed a certain amount, which is one-millionth (ppm).Generally, the term implies that halogen free means that the product material does not contain any compounds derived from these elements.Many in the electrical and electronics industries will give halogen free definitions similar to those provided in recent papers by the IPC organization, known as the Connect Electronics Industry Association.These elements do not need to be assembled with intentional use in the raw materials and will not be intentionally present in the final product.
In the development of printed circuit boards, there are many compounds and elements for various purposes.In the early stages of PCB development, many toxic compounds were used to save manufacturing costs or because of the special and useful properties of the element.As our understanding of past materials becomes increasingly clear about the threats facing the world today, manufacturers are changing their methods and looking for new materials that will not pose a threat to individuals engaged in such creations.
What level is considered halogen free?
The International Commission on Electrochemistry (IEC) sets the standard for total halogen content to 1,500 ppm by limiting the use of halogen.The chlorine and bromine limits are 900 ppm.If you comply with the RoHS, the PPM limit is the same.
Please note that there are various halogen existence standards on the market.Since halogen-free production is not a legal requirement, the allowable levels set by independent entities, such as manufacturers, may vary.Common compounds used in the development of PCB belong to the family of halogen elements.Although the compositions themselves provide certain benefits for the development of electronics, they are harmful to human life in one or another way.
These elements are:
Although there is still controversy about halogen toxicity in the development of PCB, there are two main factors that constitute the general consensus on halogen-free circuit boards.These are chlorine and bromine.Each brings special benefits to the overall safety and functionality of electronic products, but poses a threat to the continuity of human and natural life.
Advantages of Halogen Free printed circuit board:
The Halogen Free printed circuit board performance that assemblers are interested in is as good or better as similar halogenated boards.By comparing the data tables of many original PCB material suppliers, it is not difficult to find that halogen free PCBs usually have lower CTEs.They have longer T-260 and T-288 times and higher Td temperatures.These all mean that the board will be more suitable for a variety of reflux processes and can withstand higher reflux temperatures in PCBA.