Material Specs and Delamination in FR4 Board

[Baheej]

Hello all,

We just received a shipment of FR4 boards (1/4" thk) from our supplier. The boards are about 11"x31" with a rectangular hole pattern of 48 holes (4x12). Almost 80% of the holes show delamination around their edge.

Now, my QA wants to reject the parts because of concerns of water/moisture ingestion, while the supplier insists that the drawing sent to him says nothing about delamination.

Indeed, the drawing does not mention anything about delamination, but I sided with the QA simply because a delaminated part is not acceptable and will not withstand the heat and vibration of its operating environment.

Is there is any specs or data sheet that specifies a limitation on the delaminated area or the effect of the delam on the performance of the board? Thanks,

 

[SWComposites]

What is the material in a FR4 board? What is it used for? How it is loaded? What temperature is it exposed to?

 

[Baheej]

SWComposites,
FR4 is a commonly used material in making PCB, but we are using it to mount some electronic components. Regardless of the loading condition or temperatures, I need to know if there are any specs or industry standards about delamination being acceptable or not if it is within certain dimensions. My concern is that after a few months in service and with moisture ingestion, the board will fully delaminate. To prevent this I need to make an informed decision whether to accept or reject the boards. Thanks,