How to tell whether the board thickness meet the acceptance standard?

      Unless agreed upon between user and supplier, the board thickness shall meet the requirement for

the IPC Class 2 standard.

      The nominal thickness less than or equal to 1.0mm, the thickness values can generally vary

by as much as +/-0.1mm.For the nominal thickness more than 1.0mm, the values can generally vary as much as +/-10%.

       So for a printed circuit board thickness of 0.8mm. The approval thickness ranges from 0.72mm-0.88mm.While for a 1.6mm one, the approval ranges from 1.44mm-1.76mm.

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