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Trial Number 5

Client Number 149

Project Number 3

Trial Purpose:

To test the effectiveness of the removal of adhesives using HSPiP chemistries.

Date Run:

06/10/2022

Experiment Procedure:

Pre-weighed stainless steel coupons, six for each chemical (three being tested with unheated and three being tested with heated), were soiled with the Phenolics adhesive soil. Approximately 0.25 g of the soil was applied using a hand held swab. Each set of coupons were manually wiped with a cloth of the same material, one set dipped into unheated and another set dipped into the heated chemical . During this process, any noticeable soil removal was observed and recorded. Coupons were allowed were wiped with a paper towel to ensure no residue of the cleaner, and afterwards final weights were recorded. The efficiency of removal was calculated for each coupon cleaned.

Trial Results:

Heated Treatment Results

Cleaner Treatment Initial wt of cont. Final wt of cont. %Cont Removed Average % Removal
Sec-butyl acetate Heated (60-70F) 0.5784 0.0656 88.66 88.76
0.5171 0.0764 85.23
0.6567 0.0500 92.39
2-propanol 0.4138 0.4029 2.63 2.09
0.3467 0.3435 0.92
0.3373 0.3282 2.70
di-isobutyl ketone 0.5938 0.0907 84.73 77.76
0.5272 0.1751 66.79
0.4301 0.0784 81.77
2-phenoxy ethanol 0.3791 0.3688 2.72 4.00
0.4380 0.4006 8.54
0.2870 0.2849 0.73
t-butyl acetate 0.2700 0.1159 57.07 46.05
0.2710 0.1391 48.67
0.2973 0.2010 32.39
d-limonene 0.3751 0.0497 86.75 85.36
0.3391 0.0504 85.14
0.4025 0.0636 84.20
ektapro EEP 0.4124 0.0347 91.59 94.15
0.2423 0.0072 97.03
0.2510 0.0155 93.82
n-amyl acetate 0.3232 0.1351 58.20 51.73
0.3006 0.1332 55.69
0.3046 0.1788 41.30
dimethyl glutarate 0.3134 0.3016 3.77 42.47
0.2018 0.1348 33.20
0.9639 0.0921 90.45
diethylene glycol monobutyl ether 0.1727 0.1716 0.64 35.88
0.5009 0.2581 48.47
0.4221 0.1751 58.52
n-butyl acetate 0.3183 0.1138 64.25 58.14
0.3310 0.1281 61.30
0.3508 0.1793 48.89
1-propanol 0.3743 0.3708 0.94 1.04
0.2696 0.2667 1.08
0.3435 0.3397 1.11
FAME 0.3678 0.3043 17.26 17.37
0.4766 0.4438 6.88
0.3515 0.2532 27.97

Unheated Treatment Results

Cleaner Treatment Initial wt of cont. Final wt of cont. %Cont Removed Average % Removal
Sec-butyl acetate Unheated 0.7258 0.0589 91.88 88.93
0.5425 0.0725 86.64
0.4250 0.0499 88.26
2-propanol 0.2266 0.2235 1.37 2.14
0.2082 0.1985 4.66
0.2999 0.2987 0.40
di-isobutyl ketone 0.2930 0.0867 70.41 76.09
0.3587 0.1134 68.39
0.2443 0.0257 89.48
2-phenoxy ethanol 0.6850 0.6632 3.18 3.16
0.7704 0.7253 5.85
0.4024 0.4006 0.45
t-butyl acetate 0.1787 0.0450 74.82 68.51
0.1700 0.0821 51.71
0.1353 0.0284 79.01
d-limonene 0.5954 0.0733 87.69 77.47
0.3109 0.0660 78.77
0.3004 0.1023 65.95
ektapro EEP 0.1711 0.0054 96.84 95.67
0.2421 0.0182 92.48
0.2627 0.0061 97.68
n-amyl acetate 0.2469 0.0892 63.87 69.86
0.1964 0.0338 82.79
0.2402 0.0891 62.91
dimethyl glutarate 0.4656 0.4376 6.01 5.88
0.4333 0.4066 6.16
0.3385 0.3200 5.47
diethylene glycol monobutyl ether 0.2791 0.2695 3.44 4.45
0.3072 0.2950 3.97
0.3798 0.3573 5.92
n-butyl acetate 0.2175 0.0765 64.83 53.39
0.1949 0.0560 71.27
0.6194 0.4702 24.09
1-propanol 0.3754 0.3694 1.60 1.08
0.3848 0.3798 1.30
0.2827 0.2817 0.35
FAME 0.4618 0.3827 17.13 16.91
0.3756 0.3553 5.40
0.3010 0.2161 28.21

Overall Average % Removals

Cleaner Average % Removal - Unheated  Average % Removal - Heated Overall Average % Removal for Cleaner
Sec-butyl acetate 88.93 88.76 88.84
2-propanol 2.14 2.09 2.11
di-isobutyl ketone 76.09 77.76 76.93
2-phenoxy ethanol 3.16 4.00 3.58
t-butyl acetate 68.51 46.05 57.28
d-limonene 77.47 85.36 81.42
ektapro EEP 95.67 94.15 94.91
n-amyl acetate 69.86 51.73 60.79
dimethyl glutarate 5.88 42.47 24.18
diethylene glycol monobutyl ether 4.45 35.88 20.16
n-butyl acetate 53.39 58.14 55.77
1-propanol 1.08 1.04 1.06
FAME 16.91 17.37 17.14

Looking between the average % removal for unheated vs. heated there appears to be little difference in the effectiveness of the cleaner. The two exceptions to this are dimethyl glutarate (36.59% improvement) and diethylene glycol monobutyl ether (31.45% improvement) as they both were far more effective at removing the adhesive when heated. Overall the majority of the chemicals tested were found to be ineffective. The most promising cleaners to proceed with for testing include sec-butyl acetate (88.84%), d-limonene (81.42%), and ektapro EEP (94.91%). Di-isobutyl ketone (76.93%) may also be worth testing in the next trials.

Success Rating:

Preliminary compatibility tests on substrate coupons encouraging for at least one cleaning chemistry. More in-depth laboratory testing necessary.

Conclusion:

Further testing is needed to determine the efficiency of the chemicals on other types of adhesives. So far, the most promising cleaners to proceed with for testing include sec-butyl acetate (88.84% overall average removal), d-limonene (81.42% overall average removal), and ektapro EEP (94.91% overall average removal). Di-isobutyl ketone (76.93% overall average removal) may also be worth testing in the future.

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