- The ability of solvent based cleaning solutions to remove
flux residue containing polyglycols should be assessed since
not all solvent based cleaning solutions will remove polyglycols.
- A deionized water rinse should follow IPA/DI cleaning
except that a water rinse for double sided circuit boards
with plated through holes may not be required.
- Potable (drinking) water should not be used as a final
rinse due to the potential of contaminating the circuit
board assembly with chlorine, fluorine and halides.
- When automated cleaning is used for assemblies that
have been conformally coated, it is important that the cleaning
process is compatible with the type of coating used and
with any unsealed components. The coating should be checked
to ensure that the coating will not be degraded by the cleaning
|Tools and Materials
Cleaner, Aqueous or Semi-Aqueous
Isopropyl Alcohol (IPA)
Board Type: R/F/W/C | Skill Level: Intermediate
| Conformance Level: High | Rev.: E
| Rev. Date: May 8, 2001Caution
clean gloves during this entire operation. Note
To reduce solvent volumes, mixtures of IPA with water and
IPA with solvent are available in pressurized containers. The
propellants are HFC's. These containers may be fitted with
a bristle brush spray attachments for additional cleaning action.
- Clean the board in an Aqueous or Semi-Aqueous cleaner,
or pour approximately 10 ml per 4 square inches of effected
- Scrub the board vigorously with a continually wet soft
bristle brush for 10 seconds.
- Rinse the area with 10 ml per 4 square inches of clean
Isopropyl Alcohol to effectively remove all potentially
- Handle the board by the edges and blot the excess Isopropyl
Alcohol with clean, lint free cloth
- Examine board visually for cleanliness. The use of a
black light will help detect contaminants that will fluoresce.
- Dry boards in oven, if desired.
- If the boards or assemblies are to be stored before
use or coating, remove them from the oven and allow to cool
until they can be handled. Place the boards or assemblies
into self sealing bags with packages of desiccant.
- Visually examine and test for cleanliness using IPC-TM-650,
test method 2.3.25 or 2.3.26