HALOGEN FREE PCBS
Years ago, there was talk about pcbs in the future being halogen free, this never really took off, although some customers state they want their materials to be Halogen Free, for this we must purchase special halogen free laminate
Why do we want to eliminate them?
A quick web search revealed some convincingly good reasons to limit the use of specific halogens. If incinerated under certain conditions they can form dioxins, which are known carcinogens. In structural fires, they can give off toxic gases that prevent victims from escaping (and rescuers from entering) burning areas. In a computer room, a fire in one machine can release acidic fumes that produce catastrophic failures in nearby machines. These combustion-related implications sound horrible, and I’m sure there are plenty of other sound reasons to eliminate halogenated materials. Often, however, it’s the halogenated compounds that permit higher temperature operation and prevent fires in the first place, and elimination or substitution is not a simple process.
How do we define halogen-free and halide-free?
Both halogens and halides can be found in trace amounts as impurities in many materials. Therefore, upper limits for the presence of these materials have been set by the following organizations:
The International Electrochemical Commission defines halogen-free as:
  1. <900 ppm chlorine
  2. <900 ppm bromine
  3. <1500 ppm total halogens
    IPC defines halide-free as:
  4. < 500 ppm of a flux’s solids content, as chloride (fluoride and bromide are adjusted for molecular weight difference and calculated as chloride).
    To sum it up…a halogen is a chemical element that is found in many electronic components and is the focus of systematic regulatory elimination. In many cases there are no simple drop-in replacements for halogenated materials.
The halogens are five non-metallic elements found in group 17 of the periodic table. The term “halogen” means “salt-former” and compounds containing halogens are called “salts”. All halogens have 7 electrons in their outer shells, giving them an oxidation number of -1. The halogens exist, at room temperature, in all three states of matter:
  • Solid- Iodine, Astatine
  • Liquid- Bromine
Gas- Fluorine, Chlorine
http://images.tutorcircle.com/cms/images/44/halogen-on-periodic-table.PNG
Halogen Free Laminates
Our Default = Ventec
2nd Choice = R1566 Panasonic
Panasonic’s R-1566W laminate system is Halogen-free and Antimony-free. It meets Lead-free assembly requirements and its applications include Cellular Phones, Personal Devices and Automotive Components.