Why is rigid-flex PCB expensive?

Our customers often ask a question, especially in the initial quotation, they always ask "Why is the rigid-flex board so expensive?" In this article, RCY PCB will share with you that the rigid-flex board is relative to the standard board.

The cost of a single rigid-flex PCB for a neural circuit with stiffeners is about seven times the cost of a rigid substrate design, and two to three times the cost of a complex circuit with a reinforced board.

A good method for the cost of rigid-flex board for special small production is 35 to 40 cents per square inch per layer. Therefore, if you have an 8-layer board with a size of 4" x 6", your cost calculation will be:

8 floors x 4” x 6” x $0.40/sq.in. = 76.80 USD

The cost of the rigid-flex board is much higher, mainly because our cost is much higher, which only applies to the production quantity of the rigid-flex board. This is a low amount of calculation, you can roughly understand your quantity as the cost of the rigid-flex combination.

The cost of the raw materials to manufacture is far from the standard material board manufactured by the independent board itself. The first reason is no flow prepreg. Just combine the use of non-fluid or sometimes low-fluidity prepreg, the area from the resin to the plastic to the circuit board. The non-flowing prepreg provides a circuit in the area of the plate where the filling material flows, but will flow to the area of the plate.

The prices of no-flow and low-flow prepregs range from US$1.50 to US$3 per square inch. The traditional perforated high-fluidity prepreg is about US$0.25 per square, so the price of the prepreg varies greatly. Other occasions will also affect the cost. No-flow prepregs only provide 1080 and 106 glass cloth patterns, usually extruded at 0.0025" and 0.002" respectively, so they are very thin. Rigid-flexible manufacturers do not have 2113, 2116, and 7628 glass cloth patterns that can be used to manufacture circuit boards. It is smart to use two layers of prepreg in the middle of your structure. The no-flow resin resists flowing, so to assure adequate fill, we use two plies of prepreg between each layer.