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Trial Number 9

Trial Purpose:

To evaluate Crystal Simple Green at 15% solution for new pre-soiled samples.

Date Run:


Experiment Procedure:

The pre-soiled parts were weighed for dirty weights. The Crystal Simple Green was prepared at a concentration of 15% and then heated to 140 F and placed in the ultrasonics tank. The parts were then placed in the ultrasonics tank for 5 minutes. The coupons were taken out and left to dry; once the coupons were dry the clean weights were taken. After clean weights, the coupons were wiped down and weighed for initial weights. Visual observations were also noted.

Trial Results:

The higher concentration of crystal simple green reacted poorly with one of the metals as there was found to be metal particles left over in the beaker following cleaning. This had not been an issue with the lower concentration of crystal simple green. While the content removed is similar to the previous test, the presence of flaked off metal indicates that the higher concentration might not be as effective at contaminant removal as lower ones. 

Substrate  Duration   Initial  Dirty  Clean Initial wt. of cont.  Final wt. of cont.  % Cont Removed 
Aluminum  5 min 85.7738 85.8143 85.7763 0.0405 0.0025 93.83
Steel  243.9476 243.9884 243.9502 0.0408 0.0026 93.63
Stainless Steel   243.6447 243.6571 243.6452 0.0124 0.0005 95.97

Success Rating:

A follow up test, usually based on company input.


Increasing the concentration of Simple Crystal Green is not effective for the parts being cleaned. Previous testing at 10% for 5, 10, and 15 minutes showed percent removal yields in the high 90's. Future testing with the remaining coupons can be performed to see how consistent the yields are at 5 minutes for simple green 10%, which had 99% yields in Trial #7 and ~95% yields in Trial 8. The other option would be to see how effective the cleaner at a lower time span.

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