There are many types of flat cables, of course, each has a different application.
The gray flat cable is small in size and light in weight. The original design of the flat cable board is to replace the larger wire harness. The gray flat cable is on the current assembly board of plug-in electronic sub-devices. This kind of wiring harness is usually the only solution to meet the requirements of miniaturization and movement. The gray cable is a copper circuit or printed polymer thick film circuit etched on a polymer substrate. Regarding thin and light devices with compact and complex structures, the design and processing plans range from single-sided conductive wires to complex multilayer three-dimensional assembly. The total weight and volume of the gray flat cable are reduced by 70% compared to the traditional round wire harness method.
At present, many products use this kind of gray cable. Some time ago, we had a customer who made a ventilator, and the inside needs to use this flat cable.