FR4 0.8 mm 1/2 oz double sided, Cut to 12" x 9"

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9" x 12" 1/2oz copper clad is typically used in the manufacture of double sided PCB's with Plated Through Holes or Via's.
The 1/2 refers to the thickness of the copper foil cladding. Typically 1/2oz board is processed and plated upto 1oz during the manufacture process.
In low current digital applications either 1/2oz or 1oz can be used, for high current or very low resistance applications 1oz is often specified.

The copper clad is based on FR4 (Flame Retardant 4). FR-4 describes the board itself with no copper cladding. Bare FR-4 is yellow/green in colour. Typically FR-4 for PCB manufacture is clad in 1/2oz or 1oz copper foil.

FR-4 has excellent mechanical performance and good performance in dimension thickness.Copper cladded FR4 board material has an epoxy substrate with glass fiber enforcement, which is compliant with electroplating.

This is a non flammable sheet materiel, however fumes and dust may irritate skin and eyes and inhalation should be avoided to to the fiberglass nature of the sheet.