what is a flxible circuit coverlay

A flex circuit coverlay (aka coverfilm) is used to encapsulate and protect the external circuitry of a flexible circuit board.

A coverlay serves as the same function as soldermask that is used on a rigid printed circuit board. The difference with a coverlay is the added element of flexibility and durability it provides to the flexible circuit board.

The coverlay consists of a solid sheet of polyimide with a layer of flexible adhesive that is then laminated under heat and pressurized to the circuit surfaces. The required component feature openings are mechanically created using drilling, routing, or laser cutting.

Typical coverlay thickness is 0.001” polyimide with 0.001” of adhesive. 0.0005” & 0.002” thicknesses are available but only used as needed to meet specific design requirements.

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