Even experienced engineers make these mistakes:
| Problem | Likely Cause | Fix per IPC-CH-65 | |---------|--------------|-------------------| | White residue after cleaning | Incomplete rinse / hard water | Increase DI rinse time or add acid rinse | | Rosin remaining | Wrong solvent type | Use semi-aqueous or saponifier | | Component corrosion | Incomplete drying or trapped flux | Add isopropyl alcohol final rinse + extended dry | | Electrical failures | Ionic residues under BGAs | Increase wash pressure / use ultrasonics |
Reading is not enough. IPC offers specialized training courses (CLE-1000 series) that combine the standard with hands-on laboratory methods. Certified IPC specialists (CIS) in cleaning learn how to calibrate ionographs, interpret chromatograms, and troubleshoot residues by smell, appearance, and electrical behavior. ipc-ch-65
: It outlines sources of contamination, including flux activators, plating bath chemicals, etchant residues, and fingerprint oils.
Some manufacturers view cleaning as a non-value-added cost. indirectly argues the opposite. Through documented case studies (referenced in the bibliography), the standard shows that: Even experienced engineers make these mistakes: | Problem
The primary purpose of this document is to provide manufacturers, engineers, and quality assurance teams with information on:
. It provides the "how-to" rather than the "pass/fail". It outlines four key steps for a successful cleaning strategy: Characterize Contamination : It outlines sources of contamination, including flux
The industry realized that different cleaning methods (solvent, aqueous, semi-aqueous) yielded wildly different results depending on the chemistry of the flux and the materials of the board. IPC-CH-65 was created to standardize the decision-making process for cleaning, rather than prescribing a one-size-fits-all solution.
, officially titled "Guidelines for Cleaning of Printed Boards and Assemblies," is a comprehensive industry resource developed by IPC that covers nearly every facet of the electronics cleaning process. Spanning over 200 pages, the current revision, IPC-CH-65B (released in July 2011), serves as a centralized "Cleaning Handbook" for engineers and manufacturers. The Evolution of IPC-CH-65
Before cleaning, verify compatibility with: