To identify potential replacement cleaners for an adhesive contaminant that has been difficult in removing.
Date Run:
11/06/2000
Experiment Procedure:
Eight solutions were selected from the lab’s databases based on past effective cleaning of similar contaminants and vendor supplied information. Table 1 lists the cleaners selected. Each cleaner was poured into a 20 ml glass vial at full strength. The weight of the full container was recorded. A small portion of the adhesive was placed into each vial and weighed again to determine the amount of contaminant that was added.
Observations were made at 10-minute intervals during the first hour of the trial. At the 40-minute mark, the adhesive was removed from the vial. The vial was then reweighed to determine if the adhesive was being dissolved by the solutions or was the adhesive absorbing the cleaners. An increase in weight would signify that the adhesive was being dissolved and with a decrease in vial weight, it could be assumed that the adhesive was gaining weight by absorbing the cleaning solution. After the first hour, observations were made every hour for a total of six hours. Additional weighing of the vial was taken at three and six hours to determine the extent of the interaction between the solutions and the adhesive.
SUBSTRATE MATERIAL: Liquid (cleaning solution) CONTAMINANTS: Adhesive- National Starch & Chemical Co Duro-Tak Experimental Product (CAS #s: 108-88-3, 1330-20-7, 64742-88-8)
Trial Results:
Three of the eight cleaners demonstrated dissolving action during the trial. Bio T Max dissolved all of the added adhesive within the first two hours of immersion. DS-104 took four hours to complete the same task. The final dissolver was D Greeze 500 LO. The other five products resulted in increased weights at the three weighing periods. Table 2 lists the percent weight dissolved/absorbed for each of the solutions evaluated.
Table 2. Dissolving/Absorbing
Cleaner
Vial
V w/ C
40 min
3 hours
6 hours
Wt of Adhesive
40 min
3 hrs
6 hrs
Mechanism
1
24.6935
26.2415
24.8390
25.7082
25.8393
1.5480
9.40
65.55
74.02
% Dissolved
2
26.3185
27.5650
25.0972
24.6384
24.2175
1.2465
-97.98
-134.79
-168.55
% Absorbed
3
23.6354
24.4545
23.8932
24.3551
X
0.8191
31.47
87.86
X
% Dissolved
4
25.7664
27.3111
25.0141
24.5052
24.1574
1.5447
-48.70
-81.65
-104.16
% Absorbed
5
25.4519
26.4086
24.8529
24.3058
23.7153
0.9567
-62.61
-119.80
-181.52
% Absorbed
6
24.6970
25.9200
23.4662
22.8774
22.6854
1.2230
-100.64
-148.78
-164.48
% Absorbed
7
27.1368
28.6917
25.7088
24.8834
24.5203
1.5549
-91.84
-144.92
-168.27
% Absorbed
8
22.9946
24.5722
22.7374
23.3378
23.8792
1.5776
-16.30
21.75
56.07
% Dissolved
2 hours
3.5 hours
The visual observations made for the 11 time periods are recorded in Table 3. The ranking of the cleaning chemistries: Bio T Max (3, Dissolve) > DS-104(1, Dissolve) > Safe Strip(2, Absorb), D-Greeze 500 LO (8, Dissolve) > SI No 8 (7, Absorb) > Concrete/Graffiti Remover (6, Absorb) > SC Supersolve (4, Absorb) > Biosolve (5, Absorb).
Table 3. Observations
Cleaner
10 min
20 min
30 min
40 min
50 min
1 hr
2 hr
3 hr
4 hr
5 hr
6 hr
Score
Rating
1 (Dissolve)
P
F
G/E
E
E
E
E
E
Gone
X
X
48.5
80.17
2 (Absorb)
F
F/O
G
G
E
E
E
E
E
E
E
47.5
78.51
3 (Dissolve)
F
F/O
G/E
E
E
E
Gone
X
X
X
X
51.0
84.30
4 (Absorb)
F
F
P
F
O
O
F/O
O
O/G
O/G
G
29.5
48.76
5 (Absorb)
P
P
F
O
O
O
F/O
O
O
F/O
O
28.0
46.28
6 (Absorb)
F
F
F
O
O
G
G
G
O/G
O
O/G
34.0
56.20
7 (Absorb)
F
F
F
F
O
O/G
G
G/E
E
G/E
E
37.5
61.98
8 (Dissolve)
P
P
O
G
G
G
G/E
E
E
E
E
41.6
68.76
Scoring System: ExcellentèGood èOkay èFair-èPoor
E= 5, G/E = 4.5, G =4, O/G = 3.5, O = 3, F/O = 2.5, F = 2, P/F = 1.5, P = 1
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
Three cleaners were effective dissolvers and five were absorbers. Each product showed signs of altering the appearance of the adhesive. The final overall rating of the cleaning chemistries is as follows: Bio T Max 84.30%, DS-104 80.17%, Safe Strip 78.51%, D-Greeze 500 LO 68.76%, SI No 8 61.98%, Concrete/Graffiti Remover 56.20%, SC Supersolve 48.76% and Biosolve 46.28%.
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