The purpose of this trial is to see if stir-bar agitation would be suitable for Electro-Optical Devices’s needs. Four different cleaners will be tested in a stir-bar agitated beaker with and without brushing.
Cleaning was done in a stir-bar agitated beaker 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, one sample will be cleaned solely by the agitation, while the second sample will be brushed for a few seconds. 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 2 minutes 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(brushed)
CLEANING PRODUCT: Alconox Alcojet Detergent CONCENTRATION: 2% solution (20 grams per liter solution)
Trial #2-
SAMPLE NUMBERS: #3, #4(brushed)
CLEANING PRODUCT: International Products Micro CONCENTRATION: 4% by volume
SUBSTRATE MATERIAL: Soda-Lime Glass
CONTAMINANTS: Blanchard Stacking Wax #5 CONTAMINATING PROCESS USED: melted wax applied on with swab and allowed to set
Trial Results:
After cooling down, all the cleaners were ranked in four categories: Percent Removal without brushing, Removal with brushing. Wax separation from cleaner solution, and Spotting. For each category, each cleaner was assigned a number from one to four, one is for the best performer, while four is for the worst.
Percent Removal
Brushing Removal
Wax Separation
Spotting
Alcojet
1
1
2
1
Micro
3
3
1
3
Inproclean #3800
2
1
3
1
L-12
4
4
4
4
GRAVIMETRIC ANALYSIS FOR AGITATED IMMERSION
Sample #
Clean mass (g)
Mass with contamination (g)
Mass after cleaning (g)
Contaminant removed (g)
Percent Removal
1
14.8777
15.8713
14.8775
0.9938
100.02%
2
16.5521
19.1277
16.5516
2.5761
100.02%
3
12.3687
14.1690
12.6813
1.4877
82.64%
4
14.3598
16.6013
14.3642
2.2371
99.80%
5
15.0674
17.3836
15.0732
2.3104
99.75%
6
13.3556
15.6748
13.5559
2.3189
99.99%
7
14.0975
16.1344
15.1696
0.9648
47.37%
8
15.7478
18.6593
15.7907
2.8686
98.53%
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.
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