Trial Purpose:
To evaluate paint and cleaner compatibility.
Date Run:
09/21/1998Experiment Procedure:
The chemistry from the previous trial was placed in a petri dish and heated to 150 F on a hot plate. A sample of each painted-aluminum part was cut into a 1 inch square with metal snips. The pieces were placed into the hot cleaning solution. Observations were made at 15, 30, 60 and 120 minutes. Each observation included visual inspection for obvious paint removal and a scrape test to determine how easily the paint was removed from the aluminum substrate.
SUBSTRATE MATERIAL: Aluminum Parts coated with paint (not to be removed)
CONTAMINANTS: Acrylic Sealant-Aromatic Hydrocarbon (Toluene CAS# 108-88-3)
Trial Results:
Table 1 lists the different coated parts and the observations made.
| Paint Color | 15 minutes | 30 minutes | 60 minutes | 120 minutes |
| Black | Visual: No paint removal | Visual: No paint removal | Visual: No paint removal | Visual: No paint removal |
| Physical: No paint removal | Physical: No paint removal | Physical: No paint removal | Physical: Some paint removal | |
| Brown | Visual: No paint removal | Visual: No paint removal | Visual: No paint removal | Visual: No paint removal |
| Physical: No paint removal | Physical: No paint removal | Physical: No paint removal | Physical: No paint removal | |
| Beige | Visual: No paint removal | Visual: No paint removal | Visual: No paint removal | Visual: No paint removal |
| Physical: No paint removal | Physical: No paint removal | Physical: No paint removal | Physical:Some paint removal | |
| Green | Visual: Paint Bubbling | NOT TESTED | NOT TESTED | NOT TESTED |
| Physical: Lots of paint removed | ||||
| White | Visual: No paint removal | Visual: No paint removal | Visual: No paint removal | Visual: No paint removal |
| Physical: No paint removal | Physical: No paint removal | Physical: No paint removal | Physical: No paint removal |
The brown and green samples did have some of the sealant contaminant on their surfaces. The adhesive on both samples were easily removed after 5 minutes of soaking. Two samples were not affected by the extended soaking (brown and white), while 2 others could withstand a moderate soak time (black and beige) and only 1 sample had almost all of its paint removed after only 15 minutes (green).
Success Rating:
A follow up test, usually based on company input.Conclusion:
The T-Square HTF 85B was compatible with most of the painted parts supplied to the lab. Only one paint (green) was not compatible.
