To evaluate two products on supplied parts using extended immersion cleaning
Date Run:
03/05/2008
Experiment 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.
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