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Trial Number 4

Trial Purpose:

To test the effectiveness of cleaners on USP Gk-7 Lap Compound

Date Run:


Experiment Procedure:

Three pre-weighed brass coupons per substrate were soiled with USP Gk-7 Lapping Compound using a cotton swab. The soil was allowed to dry for two hours. Both cleaners were then heated to approximately 125F and the coupons were placed in their respective cleaner for 15 minutes in the ultrasonics tank. Following ultrasonics, the coupons were allowed to air dry overnight and the next day the final weights were recorded.

Trial Results:

Emerald HD had a high removal yield for all coupons except for one. This error may have been due to the coupon moving and getting stuck to another one, hindering the cleaning process. Shopmaster LPH had one high removal coupon and two others that were less effective.

Cleaner Initial wt of cont. Final wt of cont. %Cont Removed Average % Removal
Emerald HD 0.3283 0.0031 99.06 92.48
0.3401 0.0701 79.39
0.5706 0.0057 99.00
Shopmaster LPH 0.4324 0.0022 99.49 90.92
0.5939 0.0849 85.70
0.4693 0.0584 87.56

Success Rating:

Preliminary compatibility tests on substrate coupons encouraging for at least one cleaning chemistry. More in-depth laboratory testing necessary.


Emerald HD and Shopmaster LPH (at a higher concentration) were chosen as aqueous solutions that had not been tested yet to possibly solve S.E. Shires issues with Metalnox. Further testing is needed to determine the overall effectiveness of both and if one could resolve the cloudiness from actual parts. 

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