Chemicals used in PCB manufacturing include but are not limited to the following types:
1. Copper: As a conductive component, copper is used as structural components such as wires and terminals in PCB production. It is also used to make the plated holes of multi-layer PCBs and the wires connecting the layers.
2. Organic matter: used to make insulation layers, protective films and other circuit substrates.
3. Ammonia nitrogen: Mainly used to treat copper surfaces to increase their conductivity.
4. Sulfuric acid, hydrochloric acid, nitric acid, and sodium hydroxide: As strong acids and bases, these chemicals are used to treat other impurities on circuit boards.
5. Etching liquid, chemical plating liquid, electroplating liquid, activation liquid, prepreg liquid, etc.: These are various chemicals used to make circuit boards.
6. Copper complex: In electroless copper plating, copper complex is used to control the stable copper deposition speed and copper deposition thickness.
7. EDTA-CuNa₂ (sodium copper ethylenediaminetetraacetate): Flexible circuit board manufacturers generally use this chemical for first-layer copper plating and electroless copper plating in the intermediate process.
In addition, some other chemicals are used in PCB manufacturing, such as sulfuric acid, hydrochloric acid, nitric acid, sodium hydroxide, etc.