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Trial Number 10

Trial Purpose:

To evaluate the effectiveness of SB-11 (46% Ektapro EEP 54% Benzyl Benzoate), SB-22 (79% Ektapro EEP 14% t-butyl acetate 7% propylene carbonate), SB-24 (92% Ektapro EEP 8% t-butyl acetate). and SB-32 (81% ethyl lactate 19% propylene carbonate) in removing production oils from brass coupons as a potential replacement for TCE unheated immersion cleaning method.

Date Run:


Experiment Procedure:

Three brass coupons were used for each cleaner for a total of twelve coupons. The initial weights of each coupon were recorded. The bottom third of every coupon was soiled by applying Mobil Vactra Oil #2 with a swab. The dirty weights of each coupon were then recorded. The coupons were then subjected unheated immersion in SB-11, SB-22, SB-24, and SB-32 with the stir bar at 240rpm for 15 mins. After the coupons were cleaned they were left to air dry over night. The next morning, the clean weights of each coupon were taken.

Trial Results:

Cleaner Initial wt of cont. Final wt of cont. %Cont Removed % AVG
SB-11 0.1465 0.0334 77.20 85.93
0.1719 0.0084 95.11
0.2442 0.0355 85.46
SB-22 0.1282 0.0023 98.21 98.77
0.1368 0.0025 98.17
0.1635 0.0001 99.94
SB-24 0.1493 -0.0092 106.16 103.95
0.2254 -0.0080 103.55
0.2023 -0.0043 102.13
SB-32 0.2024 0.0909 55.09 69.97
0.0848 0.0217 74.41
0.0541 0.0106 80.41

The coupons cleaned with SB-24 had lower clean weights than initial weights, this could be due to the solvent stripping the brass coupons.  

The soil separated in SB-22 and SB-32, the soil dissolved in SB-11 and SB-24.

Success Rating:

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


SB-11 and SB-22 are effective cleaners in removing production oil from brass coupons using unheated immersion.  SB-32 is a somewhat effective cleaner in removing production oil from brass coupons using unheated immersion.  SB-24 should not be used on brass due to the potential of stripping the substrate.  

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