Three popular methods:
Resistivity of Solvent Extract (ROSE) Test Method IPC-TM-650 2.3.25:
The ROSE test method is used as a process control tool to detect the presence of bulk ionics. The IPC upper limit is set at 10.0 *g/NaCl/in2. This test is performed using a Zero-Ion or similar style ionic testing unit that detects total ionic contamination, but does not identify specific ions present. This process draws the ions present on the PCB into the solvent solution. The results are reported as bulk ions present on the PCB per square inch.
Modified Resistivity of Solvent Extract (Modified ROSE):
The modified ROSE test method involves a thermal extraction. The PCB is exposed in a solvent solution at an elevated temperature for a specified time period. This process draws the ions present on the PCB into the solvent solution. The solution is tested using an Ionograph-style test unit. The results are reported as bulk ions present on the PCB per square inch.
Ion Chromatography IPC-TM-650 2.3.28:
This test method involves a thermal extraction similar to the modified ROSE test. After thermal extraction, the solution is tested using various standards in an ion chromatograph test unit. The results indicate the individual ionic species present and the level of each ion species per square inch.
Most common test is R.O.S.E. Equipment sells from $ 12,000.00 - $ 30,000.00. Equipment available from Aqueous Technologies (Zero-Ion) and Specialty Coatings (OmegaMeter and Ionagraph).
If ion chromatograph is your choice, recommended labs are:
Foresite http://www.residues.com
ACI http://www.aciusa.org
Hope this helps
Mike Konrad Aqueous Technologies Corporation www.aqueoustech.com konrad@aqueoustech.com
reply »