Cleaning was done in beaker ultrasonics set at 150 F. Cleaning time will be determined during the trial depending on the cleaner's effectiveness. Two glass samples will be used for each cleaner. The samples will be rinsed in a tap water bath for 1 minute at 150 F and then in a DI water rinse for 1 minute at room temperature. The parts will then be dried under an air knife for 1 minute and then in a convection oven set at 120 F for 30 minutes.
The samples will be analyzed gravimetrically to get a percent removal. The samples will be observed with a water-break test to detect any residual wax. After drying, the samples will be checked for any water spotting that may occur.
Trial #1-
SAMPLE NUMBERS: #1, #2
CLEANING PRODUCT: Alconox Alcojet Detergent CONCENTRATION: 2% solution (20 grams per liter solution)
Trial #2-
SAMPLE NUMBERS: #3, #4
CLEANING PRODUCT: International Products Micro CONCENTRATION: 4% by volume
After cooling down, all the cleaners were ranked in three categories: Wax Removal, Wax Separation and Spotting. A number of one to four was assigned for each cleaner's performance, one being the best performer and four being the worst.
Percent Removal
Wax Separation
Spotting
Alcojet
1
2
1
Micro
3
1
3
Inproclean #3800
2
2
1
L-12
4
4
4
The Innovative Organics L-12 cleaner also had the problem of redeposition during the trial. The wax would be removed and float up on the surface, after a while, the glob of wax would sink in the solution and cling to the glass surface again.
GRAVIMETRIC ANALYSIS
sample #
clean mass (g)
mass with contamination (g)
mass after cleaning (g)
contaminant removed (g)
Percent Removal
1
14.8772
17.5155
14.8765
2.639
100.03%
2
16.5516
19.2710
16.5513
2.7197
100.01%
3
12.3678
14.6132
12.3680
2.2452
99.99%
4
14.3587
16.9307
14.3591
2.5716
99.98%
5
15.0665
18.0461
15.0665
2.9796
100.00%
6
13.3553
16.2423
13.3550
2.8873
100.01%
7
14.0972
17.3542
14.2524
3.1018
5.23%
8
15.7449
19.4233
15.8566
3.5667
96.96%
1,2 - Alconox Alcojet
3,4 - International Products Group Micro
5,6 - Oakite Inproclean #3800 7,8 - Innovative Organics L-12
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
Immersion: The stir-bar agitation appeared to provide sufficient energy for cleaning. The Alcojet and the Oakite Inproclean #3800 were both very successful in cleaning the glass samples. Brushing should also be considered to ensure cleanliness (International Products Micro cleaner was successful when brushing was applied).
Ultrasonics: The ultrasonics was successful for all cleaners except the Innovative Organics L-12 cleaner. Results suggest that a lower cleaning temperature can be used as opposed to agitated immersion. The ultrasonics also provided a better separation of wax from the cleaner solution.
Rinsing: The rinsing procedures used were successful in removing residual cleaner from the glass and leaving a spot free surface after drying. A final rinse of cold running DI water may be appropriate (some residual cleaning solution was noticed on the samples when rinsed in a still bath of DI water).
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