FR4

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FR4 may refer to:

  • FR-4 (a.k.a. FR4), is a widely accepted international grade designation for fiberglass reinforced epoxy laminates that are Flame Retardant (self extinguishing).
  • Forgotten Realms 4: The Magister, the fourth supplement of the Forgotten Realms series.
  • France 4, a television channel in France.