Ten chemistries were selected for testing based on the following: compatible with Aluminum and Stainless Steel, able to remove carbon deposits, able to be used in high pressure or immersion cleaning. Past laboratory experiments with similar conditions were examined to aid in selecting possible cleaning chemistries.
Twenty-five milliliters of each cleaner were poured into a 30 mL beaker. A 0.5 gram of the contaminant was weighed and placed into each beaker. Each cleaner was stirred for 30 seconds with a glass rod. Observations were recorded. The stirring and observation cycle was repeated.
The chemistries were then allowed to sit for 3 hours and then overnight. Stirring and observations took place after each interval.
SUBSTRATE MATERIAL: N/A CONTAMINANTS: Carbon Black/ethyl acetate/silica mixture
Trial Results:
Table 1 lists the observations after each stirring.
Table 1 Observations of Cleaning Chemistries
Chemistry
Weight Added (g)
30 Seconds Observation
60 Seconds Observation
3HR Observation
24HR Observation
1
0.5007
No mixing
Same
Same
Same
2
0.5007
Some mixing
Same
Same
Same
3
0.5014
Some mixing
Same
Same
Same
4
0.5005
Blue/grey cloudy
Black
Same
Blue/grey settling out
5
0.5009
Some mixing
Same
Same
Same
6
0.4998
Little mixing
Same
Same
Same
7
0.5003
No mixing
Same
Same
Same
8
0.5008
No mixing
Same
Same
Same
9
0.5003
Some Mixing
Same
Same
Same
10
0.4998
Mixing
Lots of mixing
Black
Same
Two of the chemistries proved to be effective in cleaning the contaminate. The number 4 and 10 cleaners showed immediate signs of dissolving the carbon black mixture after the first stirring. The number 4 cleaner appeared to dissolve more of the contaminant then the number 10 did. Both improved after the second mixing, again 4 more so than 10. After the third mixing both were about the same. After the final mixing, most of the contaminant was dissolved into solution for number 10. The carbon black started to settle out of cleaner number 4.
Success Rating:
Preliminary compatibility tests on substrate coupons encouraging for at least one cleaning chemistry. More in-depth laboratory testing necessary.
Conclusion:
Two cleaners, 4-Buckeye Shopmaster and 10-Safe Cleanup Super Neutral, were effective in dissolving the carbon black mixture. MSDSs and Technical data sheets for both have been included with this report. The next test will be to find chemistries which can clean the supplied adhesive. The initial testing will be the same as this experiment.
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