Trial #1
To evaluate the performance of two solvents for graffiti removal
One set of stainless steel and wood coupons were coated with Dayetek Daye Black quick dry lithographic ink using a handheld swab. A second set of stainless steel and wood coupons were coated with Barnes Group Bowman Distribution Industrial Finish Gloss Black spray paint No 24700. Coated coupons were allowed to sit for several hours for drying of applied ink/paint.
Three coupons were placed into a Gardner Straight Line Washability unit. A Kimberly-Clark Wypal reinforced paper towel was attached to the cleaning sled and soaked with 5-7 sprays of cleaning solutions. Each coupon was sprayed 7-10 times with the same cleaning solution. The cleaning unit was run for 20 cycles (~33 seconds). At the end of cleaning, visual observations were made, and the coupons were ranked from best to worst for each of the cleaning solvents.
The spray paint was the easier of the two contaminants to be removed using 30 seconds of manual cleaning. Both the supplied products were ranked high for the ink removal from stainless steel. The SG22002D was ranked as the most effective of the four solvents for both surfaces for ink removal. Observations and rankings for each set of coupons and contaminants are listed below.
| Product
|
Substrate
|
Contaminant
|
Rank 1
|
Rank 2
|
Rank 3
|
Average
|
Observations
|
| SG21000D
|
Steel
|
Ink
|
2
|
2
|
2
|
2.0
|
~75% removal
|
| SG22002D
|
|
|
1
|
1
|
1
|
1.0
|
Almost full removal
|
| 50:50 mix
|
|
|
4
|
4
|
4
|
4.0
|
>25% removal
|
| DBE
|
|
|
3
|
3
|
3
|
3.0
|
>50% removal
|
| SG21000D
|
Steel
|
Paint
|
3
|
3
|
4
|
3.3
|
Little removal; ink breakdown visible - purple tint
|
| SG22002D
|
|
|
2
|
2
|
2
|
2.0
|
Some removal; no breakdown
|
| 50:50 mix
|
|
|
1
|
1
|
1
|
1.0
|
Partial removal; partial breakdown of ink
|
| DBE
|
|
|
4
|
4
|
3
|
3.7
|
Significant residue
|
| SG21000D
|
Wood
|
Ink
|
3
|
3
|
3
|
3.0
|
>50% removal; still some residue
|
| SG22002D
|
|
|
1
|
1
|
1
|
1.0
|
Little residue; little staining
|
| 50:50 mix
|
|
|
4
|
4
|
4
|
4.0
|
~50% removal; residue; staining
|
| DBE
|
|
|
2
|
2
|
2
|
2.0
|
>7% removal; little staining; some residue
|
| SG21000D
|
Wood
|
Paint
|
1
|
1
|
1
|
1.0
|
Little removal; some staining; no visible breakdown
|
| SG22002D
|
|
|
4
|
2
|
3
|
3.0
|
Little residue; lots of staining
|
| 50:50 mix
|
|
|
3
|
3
|
3
|
3.0
|
More visible removal; staining
|
| DBE
|
|
|
2
|
4
|
2
|
2.7
|
Residue; staining
|
When combining the rankings for both surfaces and contaminants, the two supplied products rated as the top two products as shown in the second table.
| Overall Ink/paint ranking
|
| SG21000D
|
2.3
|
| SG22002D
|
1.8
|
| 50:50 mix
|
3.0
|
| DBE
|
2.8
|
The two supplied products were ranked as the top two products evaluated for ink and paint removal from stainless steel and wood surfaces. One follow-up test will be conducted to determine the number of cycles needed to completely remove the ink/paint from the coupons. A second trial will be conducted to determine gravimetric removal of both ink and paint from the surfaces.
No relation