Trial #1

Trial #1

Find chemistry that meets clients needs

1995

4

6

C

120

122

Coupon

10/03/1995

10.00

Immersion/Soak

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Sterling/Silver

Buffing/Polishing Compounds

DI water rinse
Tap water rinse

Air Knives

Gravimetric

This rial will test five different cleaning chemistries against the Calgon Geo-Guard 2215 (the most effective cleaner tested to date).
The five cleaners selected were Gemtek SC1000 (5%), Abatement Tech. Bio-Might (5%), Valtech Valtron SP2275 (4%), Valtech Valtron SP2001 (4%) and CSI Release (5%). All cleaners will be compared to a 5% solution of Calgon. For each cleaner, 3 silver plated coupons will be cleaned for a total of 18 coupons.
Cleaning will be performed at 126-140 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. For each set of three coupons, two were rinsed in a tap water bath, while the third was rinsed in a DI water bath. Both rinses were for one minute and at 140 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.

Cleaning Solution: 5% solution of Abatement Technologies Bio Might 100.
Cleaning Temperature (F): 127
Tap Water Rinse Temperature (F): 140
DI Water Rinse Temperature (F): 138
GRAVIMETRIC ANALYSIS

The Abatement Bio-Might 100 performed identical to the Geo-Guard 2215. The only drawback was the foam generation in the cleaning bath. All other cleaners were ineffective in removing the buffing compound, especially from the lettering on the coupons.
All tap water rinses came out with a yellowish residue. Usually water spotting from hard water agents shows up as a white film. This film could be the result of the rinse bath being contaminated with an excessive amount of buffing compound. Tap water rinse may be successful if performed in a two stage method. The deionized bath was very effective in performing a clean rinse.
Future testing will be done on some new cleaners that will be arriving in the lab in the near future (Calgon AK-6015, Matchless MC132 and MC 580). A multistage rinsing technique will also be tested out.

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