How to judge the quality of the board
The quality specification for the board industry is IPC-600, which is the industry-wide specification set by the International Printed Circuit Board Association.
Shenzhen circuit board industry judges the quality of the circuit board. Firstly, the material of the board is distinguished from the board surface, and then the ink color, copper coating, surface treatment and odor of the board are compared.
Plates generally have the following types:
1. Single-sided semi-glass plate, the cost is slightly higher, compared with the strength of the cardboard, both sides are green; the copper is better than the cardboard, no smell, 4 fiberglass board, high cost, good strength, double-sided green, basic Most of the double-sided and multi-layer hard boards are made of this material. The copper can be made very precise and fine, and the unit board is relatively heavy.
2. Ordinary HB cardboard, 22F price is the most favorable and easy to change, break, can only be a single panel; the surface color of the component is dark yellow, with a pungent odor, rough copper, thin.
3. Single-sided 94V0, CEM-1 board, the cost is higher than cardboard, but cheaper than semi-glass fiberboard, the color of the component surface is light yellow, mainly used for industrial boards and power boards with fire rating requirements.
In this regard, Shenzhen circuit board industry control is very strict, no matter what color of ink is required to be smooth, flat, can not have false copper, can not have foaming, easy to fall off, etc., characters should be clear, over-hole cover oil can not have Batch front.
Then judge the quality of the Shenzhen circuit board from the aspect of appearance.
Under normal circumstances, the appearance of Shenzhen circuit board can be analyzed and judged through three aspects;
1. Appearance of weld: Because the circuit board has many parts, if the welding is not good, the circuit board that the parts are easy to fall off seriously affects the welding quality of the circuit board, and the appearance is good. It is very important to carefully identify the interface.
2, light and color: the external circuit board has ink coverage, the circuit board can play the role of insulation, if the color of the board is not bright, it is not good.
3. Standard rules for size and thickness: The Shenzhen circuit board industry has requirements for the thickness of the circuit board. Customers can perform measurement and inspection according to the thickness and specifications of their products.