Trial Purpose:
To reevaluate proposed cleaning methodology based on results obtained at client facility
Date Run:
12/10/2002Experiment Procedure:
Three products were used at two ultrasonic frequencies, 25 and 40 kHz. Parts were cleaned for 6 minutes in glass beakers at 130 F, followed by a DI water rinse also at 130 F and finally dried using a Master Appliance Heat Gun at 500 F for 1 minute. After drying, parts were analyzed by wiping with a white towel and acetone. Following the wipe test, parts were analyzed using OSEE.
Trial Results:
Crystal Simple Green was the only product to be used in both 25 and 40 kHz Crest Ultrasonic tanks. Both parts cleaned still had the black residue. OSEE readings for the two parts did not differ significantly. Citranox was used in the 25 kHz tank only. The part cleaned in this solution also had the black residue. OSEE readings were lower for this part than for the Simple Green. Ionox HC 2 was used in the 25 kHz tank. There was less black residue on the part following the cleaning. OSEE readings were slightly higher than the Citranox cleaned part. Table 1 lists the OSEE readings for each part cleaned.
| Cleaner Used | Flat Surface OSEE Readings | Knife Edge OSEE Readings | ||
| Crystal SG 25kHz | 869, 541, 602, 562 | Ave = 644 | 328, 278, 278, 352 | Ave = 309 |
| Crystal SG 40kHz | 861, 570, 913, 771 | Ave = 779 | 356, 450, 738, 682 | Ave = 556 |
| Citranox | 358, 296, 274, 548 | Ave = 369 | 379, 377, 347, 292 | Ave = 349 |
| Ionox HC 2 | 424, 564, 473, 340, 564, 711, 593 | Ave = 524 | ||
| Double wipe w/ Acetone | 350, 408, 404 | Ave = 290 | 439, 362, 432 | Ave = 411 |
| Dirty | 300, 267, 261, 290 | Ave = 280 | 349, 285, 449, 262 | Ave = 336 |
In addition to the cleaning trials, one elbow that was chemically cleaned off site was analyzed using OSEE
Values obtained were:
| 545, 292, 266, 361, 303, 255 | Ave = 337 |
| 328, 313. 262 | Ave = 207 |
Success Rating:
A follow up test, usually based on company input.Conclusion:
The change if frequency showed some signs of improved cleaning only using OSEE. The wipe test could not distinguish between the two parts cleaned in each solution. The semi aqueous cleaned part resulted in the least amount of the black residue.
