Trial Purpose:
To evaluate two products on supplied parts using extended immersion cleaning
Date Run:
03/05/2008Experiment Procedure:
The top two products, Shopmaster RC and SC Actisolv, from the previous trials were used at room temperature. One supplied dirty part coated with the Stan Chem Inc Red Stop Off (78-93-3, 108-88-3) was immersed in each solution and cleaned at 10-minute intervals until completely cleaned. Observations were made and estimated removal was recorded at each interval. Once clean, parts were rinsed in tap water for 15 seconds at 120 F and dried using compressed at room temperature for 30 seconds.
Trial Results:
Both products did not completely remove the coating after soaking for 8 hours. However, the Shopmaster RC only had about 5% of the coating remaining, mostly in the external threading. The SC Actisolv was only moderately successful, removing about 75% of the coating. Observation and estimated percent removal are listed for each hour of cleaning in the table.
| Immersion Cleaning | ||||
| Product | Shopmaster RC | SC Actisolv | ||
| Time | Estimated % clean | Observations | Estimated % clean | Observations |
| 1 hour | 5 | soft along bottom edge | 2 | thinning along bottom edge |
| most remaining | most remaining | |||
| 2 hour | 30 | very soft on bottom | 10 | soft along bottom edge |
| thinning on inside | ||||
| 3 hour | 40 | very soft on inside | 25 | very soft on bottom |
| soft on inside | ||||
| 4 hour | 60 | easily wiped off | 40 | soft everywhere |
| 5 hour | 75 | 55 | ||
| 6 hour | 80 | stuck in threads on outside | 60 | agitation would increase |
| Mostly gone on inside | effectiveness | |||
| 7 hour | 85 | Manual wiping would remove remaining coating | 65 | |
| 8 hour | 90 | 70 | ||
| 9 hour | 95 | Still stuck in threads on outside | 75 | |
Success Rating:
Results suggest a scale-up feasible match for cleaning chemistry and equipment. Pilot plant study with actual parts recommended.Conclusion:
The Buckeye Shopmaster RH showed the most promise for removing the coating following the current practice of soaking parts for 8 hours. In addition, this product would most likely be the most successful when used with a swab for spot cleaning.
