Phenolic paper

{{Short description|Plastic-impregnated cardboard}} thumb|The back of two circuit boards. The brown one is an FR-2 made of paper phenol. '''Phenolic paper''' is a paper composite material often used to make printed circuit board (PCB) substrates (the flat board to which electronic components and traces are attached). It is a very tough board made of wood fibre and phenolic polymers. It is most commonly brown in colour, and is a fibre reinforced plastic. These PCB materials are known as FR-1 and FR-2 – FR-2 is rated to 130{{nbsp}}°C, FR-1 is rated to 105{{nbsp}}°C.<ref>[http://www.geofex.com/Article_Folders/protostyles/proto_styles.htm Effects Building Techniques Version 1.2], By R.G. Keen, 1999, Website about amateur electronics prototyping</ref>

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Category:Electronics manufacturing Category:Synthetic paper