Environmental Aspects of PTFE Based Laminates in Relation to "Halogen-Free
This paper describes the regulations introduced in Europe that are driving E&E OEM's to move towards non-bromine containing base materials and prepregs (pre-impregnated) to produce printed circuit boards, although the regulations do not actually ban the FR-4 materials, only bromine content. A review of the regulation is presented to illustrate that they do not constitute a ban of all materials that can be chemically classified as containing a "halogen" in its broadest sense, but a move towards "bromine-free". PTFE based materials are not included in any current or future regulatory guidelines or bans. Data presented prove that the outstanding characteristics of PTFE including thermal stability, flame resistance, electrical properties and durability of electrical properties render this plastic as the top choice for the fabrication of printed circuit boards.
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