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What causes PCB bow and twist?-Mixed Material Types

What causes PCB bow and twist?-Mixed Material Types

Designs that incorporate a mixture of different material types in their stack up, such as a Rogers/FR4 hybrid construction, are also prone to bow and twist because each material has a different coefficient of thermal expansion (CTE). Materials with dramatically different CTE characteristics may be flat pre-assembly, but will demonstrate bow or twist after reflow assembly process.If a mixed material PCB is unavoidable, make sure to use a very gradual heating profile with as many heating zones as possible. At least 7 to 10 zones is recommended for these types of boards with the slowest temperature ramp up you can manage. The more zones and time that can be used for your assembly, the better.


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

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