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Trial Number 5

Trial Purpose:

To evaluate dimethyl glutarate on removing Mystery Oil and Rustlick 50/50 on aluminum, ceramic, and copper coupons.

Date Run:

08/08/2019

Experiment Procedure:

Six coupons, three for each contaminant, were pre-weighed for each cleaner before soiling halfway on one side using a hand-held swab. Contaminated weights were recorded before placing three coupons of the same contaminant at a time into a 250 mL beaker of diluted cleaning solution at room temperature (68 F). Coupons were immersed completely for 15 minutes with written observations being made every five minutes. Coupons then air dried for five minutes before a towel wipe test was performed using a clean paper towel to look for residue and final weights were taken.

Trial Results:

Cleaner Soil Coupon Initial wt. of cont. Final wt. cont. % Cont. Removed Average Overall Average
Ceramic Mystery Oil 71 0.0064 0.0023 64.06 51.97 68.94
10 0.0122 0.0032 73.77
35 0.0083 0.0068 18.07
Rustlick 50/50 5 0.1317 0.0174 86.79 85.90
13 0.0904 0.0141 84.40
91 0.1091 0.0147 86.53
Copper Mystery Oil 5096 0.0197 0.0028 85.79 71.57 81.60
3357 0.0179 0.0061 65.92
4149 0.0073 0.0027 63.01
Rustlick 50/50 3988 0.0558 0.0041 92.65 91.62
3579 0.0474 0.0032 93.25
2954 0.0607 0.0067 88.96
Aluminum Mystery Oil 12 0.0141 0.0103 26.95 36.70 58.34
9 0.0193 0.0138 28.50
28 0.0172 0.0078 54.65
Rustlick 50/50 11 0.1006 0.0191 81.01 79.99
4 0.0771 0.0158 79.51
24 0.0603 0.0124 79.44

Visual Observations:

Contaminant: Mystery Oil

Substrate 5 Mins 10 Mins 15 Mins Rinse
Ceramic

- no visible bubbles

- clear dilution

- no visible bubbles

- clear dilution

- no change

 

 

- soil still visible on coupon
Copper

- no visible bubbles

- clear dilution

 

- no visible bubbles

- clear dilution

- no change - soil still visible on coupon
Aluminum

- no visible bubbles

- clear dilution

- no visible bubbles

- clear dilution

- no change

- soil still visible on coupon

 

Contaminant: Rustlick 50/50

Cleaner 5 Mins 10 Mins 15 Mins Rinse
Ceramic

- soil visibly removing from coupon

- soil rising to top of dilution

- soil visible at top of dilution

- soil visible at top of dilution

 

 

- no color change

- soil still visible on coupon

Copper  - soil visible on surface - soil visible on rim and surface

- soil visible on rim and surface

 

- no color change

- soil still visible on coupon

 

Aluminum

- soil visible on rim

 

- soil visibly removing from coupon

- soil at surface

- soil visibly removing from coupon

- soil at surface

- soil still visible on coupon

                               

Success Rating:

Test incomplete or inconclusive.

Conclusion:

Dimethyl glutarate was not effective at removing Mystery Oil or Rustlick 50/50. Next step is to repeat the test with added heated agitation.

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