Up to now, the Sakura pink ink has been launched for a week, the pink PCB has attracted a large number of electronic enthusiasts to experience, including some of the pursuit of novel enterprises.

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After the pink ink, a new technology will be added recently at PCBBUY! This new boards and new technology will meet the needs of more customers. In this article, we will introduce you halogen-free PCB, if you are going to learn more about it, please check and read the content below for more knowledge.

What is halogen-free PCB?

Like the RoHS lead free requirements, halogen free standards require CMs to use new materials and manufacturing methods. Like with any standard halogen free specific limits that are set by various organizations. The IEC defines halogen free as < 900 ppm of chlorine and bromine and < 1500 ppm total halogens, while the RoHS has its own limits.

Now why is “halogen free” in quotations? It’s because meeting the standard doesn’t necessarily guarantee your board has no halogens in it. For example, the IPC specifies tests for detecting halogens in PCBs, and these tests generally detect ionically bonded halogens. However, most of the halogens found in fluxes are covalently bonded so the test won’t detect them. This means that to make a truly halogen free board, you’ll need to go beyond what the standards specify.

Why is halogen banned?

We know the halogen elements refer to fluorine (F), chlorine (CL), bromine (Br), iodine (I), Atastatium (At). Because of the good flame retardancy, Cl and Br are often used in flame retardants for electronics. Most of the used circuit boards, such as FR4 PCB and CEM3 PCB, contain halogen-containing flame retardants.

Research by related institutions has shown that halogen-containing flame retardant materials emit a large amount of highly toxic gas with the unpleasant smell when burning, which not only affects the environment but also is a carcinogen to humans.

One proof was that RoHS was enacted on July 1, 2006, prohibiting the use of two halogenated flame retardants: polybrominated biphenyls (PBB) and polybrominated diphenyl ethers (PBDE). And then in 2008, tetrabromobisphenol A (TBBPA) and hexabromocyclododecane (HBCD or HBCDD) were added to this list, while PBB, PBDE, and TBBPA were just right the most important flame retardants ever used in PCBs.

Currently, the inclusion of PBB and PBDE has been banned from use in electronic materials by the European Union and China. In order to achieve sustainable development, it is necessary to ban halogen.

What are the features of halogen-free PCB?

Insulation

Since the halogen atoms are replaced by P or N in halogen-free board, the polarity of molecular bond segment of epoxy resin is reduced to a certain extent, thus improving the insulation resistance and resistance to wear.

Water absorption

The probability of forming hydrogen bonds with hydrogen atoms in water is lower than that of halogen materials, so the water absorbency of halogen materials is lower than that of conventional halogen flame retardant materials. For the board, low water absorption to improve the reliability and stability of the material has a certain impact.

Thermal stability

The content of nitrogen and phosphorus in halogen-free board is higher than that of halogen in ordinary halogen-based material, so the molecular weight and Tg value of the monomer are increased. When heated, the kinetic capacity of its molecules will be lower than that of conventional epoxy resins, so the thermal expansion coefficient of halogen-free materials is relatively small.

Compared with halogen board, halogen-free PCB board has more advantages. Halogen-free board will replace halogen board in the future.

Why to choose halogen-free PCB at PCBBUY?

New technology at PCBBUY

·  TG130 double-sided PCB, board thickness 3.0mm, copper thickness 1oz & 2oz.

·  TG130 double-sided PCB, board thickness 1.0mm/1.2mm /1.6mm, halogen-free material

New material at PCBBUY

The new halogen-free board of PCBBUY is online quote, and the first delivery has arrived at the factory. Halogen-free PCB is a more environmentally friendly, according to jpCA-ES-01-2003 standard: C1, Br content less than 0.09% Wt copper clad board, defined as halogen-free copper clad board. Halogens refer to the halogen elements in the periodic table, including fluorine (F), chlorine (Cl), bromine (Br), and iodine (I).

When the flame retardant materials containing halogens are discarded and burned, they will release highly toxic gases and they are smelly and carcinogenic. Besides, it cannot be discharged after being ingested by the human body, seriously affecting human health. Therefore, it is necessary to ban halogen.