Today, let’s continue to learn the statistical problems and solutions of solder mask manufacture.
| Problem | Causes | Improvement Measures |
| Whiskering/Blistering | Over development | Adjust development parameters, see problem "Overdevelopment" |
| Poor board pre-treatment, surface contamination with oil and dust | Ensure proper board pre-treatment and maintain surface cleanliness | |
| Insufficient exposure energy | Ensure proper board pre-treatment and maintain surface cleanliness | |
| Abnormal flux | Adjust the flux | |
| Inadequate post-baking | Check post-baking process | |
| Poor Solderability | Incomplete development | Address factors causing incomplete development |
| Contamination of post-baking solvent | Increase oven ventilation or clean the board before soldering | |
| Post-baking Oil Explosion | Lack of stage baking | Implement stage baking |
| Insufficient viscosity of via filling ink | Adjust the viscosity of the via filling ink | |
| Dull Ink | Mismatch of thinner | Use a matched thinner |
| Low exposure energy | Use a matched thinner | |
| Overdevelopment | Adjust development parameters, see problem "Overdevelopment" | |
| Ink Discoloration | Insufficient ink thickness | Increase ink thickness |
| Substrate oxidation | Check pre-treatment process | |
| Excessive post-baking temperature | Check post-baking parameters, avoid over-baking | |
| Weak Adhesion of Ink | Inappropriate ink type | Use appropriate ink |
| Incorrect drying time and temperature, insufficient ventilation during drying | Use correct temperature and time, increase ventilation | |
| Improper or incorrect amount of additives | Adjust the amount or use different additives | |
| High humidity | Increase air dryness | |
| Screen Clogging | Rapid drying | Add a slow-dry agent |
| Slow printing speed | Increase speed and add a slow-dry agent | |
| High ink viscosity | Add ink lubricant or a special slow-dry agent | |
| Unsuitable thinner | Use specified thinner | |
| Penetration and Blur | Low ink viscosity | Increase concentration, avoid thinners |
| Excessive printing pressure | Reduce pressure | |
| Poor squeegee | Replace or adjust the angle of the squeegee | |
| Inappropriate distance between screen and printing surface | Adjust the distance | |
| Reduced screen tension | Create a new screen |
