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Trial Number 5

Trial Purpose:

To evaluate two products on supplied parts using extended immersion cleaning

Date Run:


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.


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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