The purpose of this trial is to find a chemistry that is suitable for Silversmith's needs. This trial will test five different cleaning chemistries against Silversmith's current chemistry (Texo Corp. Texolite 1734SL.)
The five cleaners selected were Calgon Geo-Guard 2215 (5%), Matchless MC 135 (4%), Matchless MC 580 (4%), Novamax Spectrum BCR (5%) and Calgon AK 6215 (4%). For each cleaner, 3 silver plated coupons will be cleaned for a total of 18 coupons.
Cleaning will be performed at 134-143 F for ten minutes in a beaker agitated with a stir-bar. Identical stir-bar settings will be used on all cleaning solutions to ensure that all parts receive equal agitation. The coupons were rinsed for 30 seconds in a static tap water rinse set at 100 F.
All coupons were weighed before and after contamination and after drying to obtain a percentage removal. The coupons were also visually inspected for any films that might have remained from ineffective rinsing. The three best cleaners will be used in an ultrasonic run with some contaminated silverware obtained from Silversmith. The parts were cleaned for 5 minutes at 140 F. Rinsing was performed for 30 seconds in a tap water bath at 100 F.
Trial Results:
GRAVIMETRIC RESULTS
Cleaning Solution: 4% Matchless MC 135
Cleaning Temperature (F): 143
Tap Water Rinse Temperature (F): 102
sample # /
clean mass
mass with
mass after
contaminant
Percent
substrate
(g)
cont (g)
cleaning (g)
removed (g)
Removal
833
36.1331
36.3513
36.1426
0.2087
95.65%
9696
36.1995
36.4386
36.2628
0.1758
73.53%
7634
35.9915
36.1024
35.9984
0.104
93.78%
Average
87.65%
StDev.
12.27%
Cleaning Solution: 5% Solution of Calgon Geo-Guard 2215
Cleaning Temperature (F): 134
Tap Water Rinse Temperature (F): 102
sample # /
clean mass
mass with
mass after
contaminant
Percent
substrate
(g)
cont (g)
cleaning (g)
removed (g)
6169
36.1093
36.3447
36.1126
0.2321
98.60%
9477
36.1331
36.3513
36.1426
0.2087
95.65%
8840
36.1132
36.3226
36.1151
0.2075
99.09%
Average
97.78%
StDev.
1.86%
Cleaning Solution: 4% Solution of Matchless MC580
Cleaning Temperature (F): 141
Tap Water Rinse Temperature (F): 102
sample #
clean mass
mass with
mass after
contaminant
Percent
substrate
(g)
cont (g)
cleaning (g)
removed (g)
Removal
1447
36.3757
36.5388
36.3754
0.1634
100.18%
8028
36.031
36.2547
36.0331
0.2216
99.06%
6502
35.8792
36.2758
35.8954
0.3804
95.92%
Average
98.39%
StDev.
2.21%
Cleaning Solution: 4% Solution of Calgon AK-6215
Cleaning Temperature (F): 143
Tap Water Rinse Temperature (F): 102
sample #
clean mass
mass with
mass after
contaminant
Percent
substrate
(g)
cont (g)
cleaning (g)
removed (g)
Removal
6282
35.8571
36.0822
35.8563
0.2259
100.36%
578
36.2884
36.4821
36.2888
0.1933
99.79%
6968
35.9252
36.0917
35.9234
0.1683
101.08%
Average
100.41%
StDev
0.65%
Cleaning Solution: 5% Solution of Novamax Spectrum BCR
Cleaning Temperature (F): 140
Tap Water Rinse Temperature (F): 100
sample # /
clean mass
mass with
mass after
contaminant
Percent
substrate
(g)
cont (g)
cleaning (g)
removed (g)
Removal
268
36.2572
36.4275
36.259
0.1685
98.94%
1843
36.4164
36.5713
36.4189
0.1524
98.39%
9967
36.2268
36.3532
36.2268
0.1264
100.00%
Average
99.11%
StDev
0.82%
Cleaning Solution: 2% Solution of Texo Corp Texolite 1734SL
Cleaning Temperature (F): 137
Tap Water Rinse Temperature (F): 99
sample #
clean mass
mass with
mass after
contaminant
Percent
substrate
(g)
cont (g)
cleaning (g)
removed (g)
Removal
239
36.2552
36.4109
36.3018
0.1091
70.07%
1450
36.3759
36.5232
36.4176
0.1056
71.69%
9354
36.1662
36.3143
36.2236
0.0907
61.24%
Average
67.67%
StDev.
5.62%
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
Three chemistries were found to be the best performers (Matchless MC 580, Calgon AK- 6215 and Novamax Spectrum BCR). The Matchless MC 580 was visually the most effective cleaner especially when used with ultrasonics. The Calgon AK-6215 was the only low foaming cleaner out of the three. However, due to the fatty acids contained in the buffing compound, saponification took place and the Calgon AK-6215 had a higher foam level as the soil loading had increased.
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