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stock two PCB materials FR4 and FR2. FR4 material is resin based, glass reinforced, 1oz copper
coated, PCB laminate. FR2 material is similar in appearance, but uses laminated paper rather
than glass. It is not quite so strong, but it is much less abrasive. This means much longer tool
life and lower cost, making it an ideal choice for education.
FR4 material is available in two thicknesses 1.6mm and 1mm. The 1mm is non-standard, but is ideal for use with plotters when direct plotting.