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Trial Number 1

Client Number 524

Project Number 1

Trial Purpose:

To test the efficacy of other solvents to manually remove three types of polymers from stainless steel

Date Run:

11/21/2024

Experiment Procedure:

Three 304 stainless steel coupons were assigned to each of the soils per solvent resulting in a total of 27 coupons total.  Each coupon was weighed with a mass balance and had their initial weights recorded.  Each coupon was then soiled with its respective polymer and catalyst mixture.  To soil each coupon, a pipette was used to apply a 0.5ml of the correct polymer catalyst mixture in a stripe across the middle of the coupons.  The stripe of soil was then spread with a paint scraper to apply a thin coating to the bottom half of the coupon.  After drying for 30 seconds, the next layer was applied.  Each coupon was soiled with a total of 5 layers.  After the soil was applied, the coupons were placed in the oven at 325F for 5 mins to cure the polymers.  Each coupon had their dirty weights recorded.  Each coupon was then timed while manually wiped with a cotton rag dipped in the respective solvent with circular motions.  Manual wiping was ceased when all visible soil was removed from a coupon.  If all visible soil was not able to be fully removed at 5 mins (300 seconds), cleaning was ceased.  Coupons were then left to air dry for 30 mins before recording their clean weights.

Trial Results:

Cleaner Soil Initial wt of cont. Final wt of cont. %Cont Removed % AVG % Overall Time until clean Secs AVG Secs Overall
Dimethyl Succinate 7195 NF Alum 0.0575 0.0061 89.39 17.96 46.13 202 267 187
0.1026 0.1346 -31.19 300
0.0973 0.1015 -4.32 300
7229 0.0847 0.0119 85.95 26.56 194 265
0.0849 0.0865 -1.88 300
0.0956 0.0998 -4.39 300
7223 0.1759 0.0104 94.09 93.87 35 28
0.1445 0.0099 93.15 22
0.1675 0.0094 94.39 26
Sta Sol 7195 NF Alum 0.1285 0.0114 91.13 60.47 44.78 58 165 164
0.1013 0.0131 87.07 138
0.0716 0.0693 3.21 300
7229 0.0806 0.1005 -24.69 -14.99 300 300
0.1262 0.1503 -19.10 300
0.1112 0.1125 -1.17 300
7223 0.1118 0.0130 88.37 88.85 20 26
0.1252 0.0141 88.74 46
0.1440 0.0152 89.44 13

The polymers 719f NF Alum and 7229 absorbed the cleaning liquid during the cleaning cycle causing the clean weights to be heavier than the initial weights, resulting in negative percentages of contaminant removed.  

Neither Dimethyl Succinate nor Sta Sol evaporated after 30 mins of air drying, so all coupons were dried with a heat gun before taking clean weights.

Success Rating:

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

Conclusion:

Neither Dimethyl Succinate nor Sta Sol are effective in removing all three polymer soils from stainless steel.  Both were only successful in removing the 7223 soil.

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