The one successful product from the previous trial (International Products Surface Cleanse 930) was diluted to 10% using DI water in a 2000 ml beaker and heated to 130 F on a hot plate. A portion of the supplied part was immersed into the solution and soaked for 1 hour. The part was observed at 5, 10, 20, 30 and 60 minutes to determine the effectiveness of the cleaning. At each interval, the part was pulled from the solution and wiped with a paper towel.
Contaminants: Bob Smith Industries Insta-Cure adhesive (7085-85-0), Insta-Set (64742-89-8, 99-97-8) and a water soluble sealant.
The cleaner was successful in dissolving the green water soluble sealant. After the hour of soaking the metal foil was easily peeled off of the metal ring. Observations are recorded in the table below.
Table 1. Cleaning Interval Observations
| Time (min)
|
Observations
|
| 5
|
Starting to dissolve the green sealant
|
| 10
|
Green wipes off easily
|
| 20
|
The cleaning solution started turning green
|
| 30
|
Most of the green sealant was removed
|
| 60
|
Peel metal off easily, metal under film looked free of adhesive
|