Trial Purpose:
To evaluate the effectiveness of SB-22 (79% Ektapro EEP 14% t-butyl acetate 7% propylene carbonate) and SB-24 (92% Ektapro EEP 8% t-butyl acetate) in removing J-2 oil from brass coupons as a potential replacement for TCE unheated immersion cleaning method.
Date Run:
09/06/2023Experiment Procedure:
Nine brass coupons were used for each cleaner being tested for a total of 18 coupons. The initial weights of each coupon were recorded. The bottom third of every coupon was soiled by applying the soil with a swab. The dirty weights of each coupon were then recorded. The coupons were then subjected unheated immersion in SB-22 and SB-24 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 weight | Final weight | Percent Removed | Average Percent Removed |
| SB-22 | 0.2659 | 0.0058 | 97.82 | 97.91 |
| 0.2795 | 0.0052 | 98.14 | ||
| 0.2686 | 0.0060 | 97.77 | ||
| 0.2370 | 0.0079 | 96.67 | 96.54 | |
| 0.2456 | 0.0108 | 95.6 | ||
| 0.2179 | 0.0058 | 97.34 | ||
| 0.2734 | 0.0039 | 98.57 | 98.29 | |
| 0.3094 | 0.0077 | 97.51 | ||
| 0.2698 | 0.0033 | 98.78 | ||
| SB-24 | 0.3037 | 0.0035 | 98.85 | 98.15 |
| 0.3388 | 0.0060 | 98.22 | ||
| 0.2616 | 0.0069 | 97.36 | ||
| 0.3479 | 0.0061 | 98.25 | 98.01 | |
| 0.3106 | 0.0060 | 98.07 | ||
| 0.2700 | 0.0062 | 97.70 | ||
| 0.2574 | 0.0046 | 98.21 | 97.74 | |
| 0.3063 | 0.0057 | 98.14 | ||
| 0.1884 | 0.0059 | 96.87 |
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.Conclusion:
Both cleaners proved to be as effective as TCE but the coupons immersed in SB-22 had a greasy residue after the 24 hour air dry.
