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https://blog.epectec.com/guide-to-using-different-types-of-gold-in-pcb
Oct 22, 2018 · While gold plating is frequently used for printed circuits boards (PCBs), selecting the most useful gold PCB surface finish can be somewhat more of a mystery. Understanding the different compositions and practical uses of gold finishes such as ENIG, ENEPIG, and gold fingers can help you find the right finish to match your circuit board needs.
https://oceanservice.noaa.gov/facts/pcbs.html
Nov 05, 2020 · PCBs were also sprayed on dirt roads to keep the dust down prior to knowing some of the unintended consequences from widespread use. Prior to the ban in 1979, PCBs entered the air, water, and soil during manufacture and use. Wastes from the manufacturing process that contained PCBs were often placed in dump sites or landfills.
https://www.twistedtraces.com/blog/3-main-types-pcb-materials/
The performance and level of integration of the PCB is completely dependent on the material used to fabricate the PCB. Types of Materials Used for PCB Fabrication. There are three major types of materials used for fabrication of PCBs: FR-4 This is the most commonly used material in PCBs. It is a glass reinforced epoxy laminate sheet.
https://greentumble.com/what-are-pcbs-used-for/
Oct 22, 2015 · What were polychlorinated biphenyls (PCBs) used for in the 1970s? Polychlorinated Biphenyls (PCBs) were manufactured beginning in 1929 until they were banned in 1979 based upon the discovery of their toxicity and accumulation in the environment [1].. Because PCBs are highly stable and insulating, they served as ideal chemicals for many different industrial and commercial uses, including:
https://www.epa.gov/sites/production/files/2016-03/documents/pcbs_in_building_materials_questions_and_answers.pdf
Potential sources of PCBs in schools and other buildings built or renovated between about 1950 and 1979 include caulking used around windows, door frames, building joints, masonry columns and other masonry building materials. PCB-containing caulk may be present inside and on the exterior of the building as well as in surrounding surfaces.
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