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Trial Number 0

Client Number 465

Project Number 3

Trial Purpose:

To test the efficacy of several solvents and aqueous cleaners in removing three types of soils from brass coupons.

Date Run:

11/06/2024

Experiment Procedure:

Three brass coupons were used per each soil for each of the cleaners tested.  Each coupon was weighed with a mass balance scale and had their initial weights recorded.  Each coupon was then soiled with one of the three soil, Slide Gel no. 7, American Lapping compound, or Honing oil, by applying an equal amount of each soil to the bottom third of each coupon with a swab.  The coupons were then weighed again and had their dirty weights recorded.  Coupons were cleaned in groups of three.  The coupons were subjected to 30 mins of heated immersion at 130F with a stir bar set to 300 rpm.  After removing the coupons from immersion, the coupons were immediately rinsed by holding the coupons under a stream of room temperature tap water for 30 seconds.  The residual water was then removed from each coupon using an air blowoff method to dry the coupons.  After the coupons were dried, their final weights were recorded. 

Trial Results:

Cleaner Soil Initial wt of cont. Final wt of cont. %Cont Removed % AVG % Overall
Methyl Acetate 100% Slide Gel No.7 0.0872 0.0033 96.2156 77.39 21.01
0.0183 0.0022 87.9781
0.0371 0.0193 47.9784
American Lapping Compound 0.0262 0.0286 -9.1603 -8.57
0.0614 0.0635 -3.4202
0.0175 0.0198 -13.1429
Honing Oil 0.0134 0.0142 -5.9701 -5.78
0.0114 0.0124 -8.7719
0.0192 0.0197 -2.6042
Dipropylene Glycol Methyl Ether 100% Slide Gel No.7 0.0389 0.0132 66.0668 66.76 78.45
0.0762 0.0085 88.8451
0.0238 0.0130 45.3782
American Lapping Compound 0.0408 0.0020 95.0980 85.29
0.0223 0.0021 90.5830
0.0161 0.0048 70.1863
Honing Oil 0.0229 0.0029 87.3362 83.29
0.0329 0.0056 82.9787
0.0132 0.0027 79.5455
Emerald ICP 1 5% Slide Gel No.7 0.0526 0.0261 50.3802 52.74 63.69
0.0216 0.0108 50.0000
0.0166 0.0070 57.8313
American Lapping Compound 0.0251 0.0193 23.1076 32.57
0.0109 0.0058 46.7890
0.0241 0.0174 27.8008
Honing Oil 0.0344 -0.0014 104.0698 105.76
0.0467 0.0000 100.0000
0.0159 -0.0021 113.2075
BG clean 402 10% Slide Gel No.7 0.0302 0.0162 46.3576 73.81 100.45
0.0199 0.0029 85.4271
0.0502 0.0052 89.6414
American Lapping Compound 0.0177 0.0052 70.6215 64.09
0.0199 0.0061 69.3467
0.0216 0.0103 52.3148
Honing Oil 0.0345 0.0000 100.0000 163.45
0.0108 -0.0113 204.6296
0.0098 -0.0084 185.7143
Propylene Carbonate Slide Gel No.7 0.0533 0.0142 73.3583 58.80 72.28
0.0575 0.0385 33.0435
0.0750 0.0225 70.0000
American Lapping Compound 0.0892 0.0323 63.7892 57.49
0.1114 0.0300 73.0700
0.0660 0.0425 35.6061
Honing Oil 0.0142 -0.0001 100.7042 100.56
0.0149 0.0000 100.0000
0.0101 -0.0001 100.9901

Methyl Acetate began to evaporate at 130F, as this is very close to the boiling point.

Success Rating:

Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.

Conclusion:

None of the cleaners tested were effective in removing all three soils.  

Propylene Carbonate was very effective in removing honing oil from brass.  Emerald ICP 1 was very effective in removing honing oil from brass.  Dipropylene Glycol Methyl Ether was somewhat effective in removing the american lapping compound and honing oil from brass.

The American lapping compound seems to be the most difficult soil to remove, and often ends up absorbing the cleaner increasing the final weights.

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