Phenolic paper is a material often used to make printed circuit board substrates (the flat board all the components and traces are attached to). 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-1 is rated to 130C, FR-2 is rated to 105C. [1]