What is halogen-free FR-4 material?

In previous articles, I discussed "How to Choose PCB Materials," "A Brief Overview of PCB Materials," and "How to Prepare PCB Materials." Today, let's talk about halogen-free FR-4 materials.
What is halogen-free FR-4 material?
As defined by IPC and IEC, a material can only be considered halogen-free FR-4 if the content of bromine and chlorine is each less than 900 PPM, and the total content of bromine and chlorine is less than 1500 PPM. At the same time, when using halogen-free FR-4, all materials used must meet the halogen-free requirements.
Halogen-free FR-4 vs. Lead-free FR-4
The grade of halogen-free FR-4 is higher than that of lead-free FR-4. Halogen-free FR-4 essentially meets the requirements for lead-free assembly. On the other hand, lead-free FR-4 that meets the requirements for lead-free assembly does not necessarily meet the halogen-free requirements.
As you know, there are many types of PCB materials. Choosing the right material affects the durability and reliability of the final product.

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