What causes PCB bow and twist？-Finished Thickness

Very thin boards are more prone to bow and twist because there simply isn't as much material available to keep the board stiff. The potential for board warp is also increased the longer the board is.

Standard finished thicknesses are 0.062", 0.040", 0.031" (1.6mm, 1mm, 0.8mm). These thicknesses should not be a problem assuming adequate copper distribution guidelines mentioned above are followed. Anything under 0.031" / 0.8mm has a greater chance for warping than thicker boards.


To know more:
What causes PCB bow and twist？-Uneven Copper Distribution
What causes PCB bow and twist？-Unbalanced Stack Up
What causes PCB bow and twist？-Pre-Preg Materials Arranged Incorrectly
What causes PCB bow and twist？-Mixed Material Types
What causes PCB bow and twist？-Finished Thickness
What causes PCB bow and twist？-Moisture
What causes PCB bow and twist？-Rapid Heating During Assembly
What causes PCB bow and twist？-Assembly Conveyor Setup