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Flexible PCB

Flexible printed circuit boards, also called Flexible PCBs, FPC or Flex PCBs, are made of very thin substrates with high levels of bendability, tensile strength and physical flexibility.The IPC defines a flexible printed circuit as “a patterned arrangement of printed circuitry and components that utilizes flexible base material with or without flexible coverlay.” This definition, while basic, illustrates what you can expect from a flex PCB – a bendable printed circuit that is made of a flexible film.

Unlike traditional rigid PCBs, flex PCBs offer the advantage of being able to bend, twist, and fold to fit into tight or irregular spaces. This flexibility makes them ideal for applications where space constraints, weight reduction, or durability are critical factors.Flex PCBs, however, have become far more complex over the years as they have been applied to industries across the board. Below, we examine some of the most common types of flexible printed circuit boards being used today.

For detailed capabilities, please refer to the following form.

Items		Technical Specifications	Remarks
File required		Gerber RS-274X Format；ODB; Common EDA's like .pcb,.brd	Pls list your EDA software name and version to avoid conversion mistake
Base material		PI; PET; Cu
Flexible insulator		PI : 1/2mil(12.5um) to 5mil (127um) PET: 1/2mil(12.5um) to 5mil (127um)
Conductor		(Copper) Rolled Annealed (RA) Electrodeposited (ED)	thickness: 1/3oz(12um) to 6 oz(200um)
Adhesive		Acrylic adhesive	thickness: 1/2mil (12.5um) to 3 mil (760um)
Adhesive		Adhesiveness materials
Solder mask	PI PET	Covered in layers PI and PET film
Solder mask	Resist Oil	Solder Mask resist oil (Green,Black,Yellow,White)	thickness:12-18um
Stiffener		PI PET thickness:0.075-0.3mm	Must be shown on design
		FR4 thickness: 0.2-3mm
		steel thickness :0.075-0.5mm
Rigid -Flexible		PI+FR4	thickness: 3 mil to 125 mil
Surface Finish	Tin	Immersion Tin
	Gold	Immersion Gold thicknees: 0.025-0.05um Electrolytic Hard Gold thickness:>0.05um	Immersion Gold is commonly used
	Silver	Immersion Silver
	OSP	Organic Solderability Preservative
Shielding		Black Electromagnetic Film Required to limit Electromagnetic and/or Electrostatic
Impedance		impedance tolerance:+/-10%
Layers		1 to 8 layers(Flexible ,Rigid-Flexible)
Board size		Max size:1420 mm400 mm Min size:2.5 mm2.5 mm
Outline tolerance		Hand trim tolerance:+/-0.2 mm
		Cutter dies tolerance:+/-0.2 mm
		Punch dies tolerance :+/-0.075 mm
		Laser cut tolerance :+/-0.05 mm
Min hole dimension	Drilling (P.T.H)	Machine Drilling: ￠ 0.15 mm Laser Drilling: ￠ 0.05 mm
Min hole dimension	冲孔 Punching	￠ 0.50 mm
Tolerance of bronze coated hole		±0.05 mm
导体 Conductor	Min width and tolerance	Min width: 1.5 mil ,Tolerance :+/- 15%
导体 Conductor	Min spacing and tolerance	Min Spacing: 1.5 mil Tolerance :+/- 15%
Pad		Min pad>:0.25 mm
Stiffener holes		Min stiffener holes:>0.2 mm
Peeling strength		1.0 KGF/CM（Adhesive copper） 0.5 KGF/CM(Adhesiveness copper）
Color of oil		Applicable to silk printing in multi colors(white,black,yellow,blue)

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