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Toxics Use Reduction Institute · Surface Solutions Laboratory
 
Toxics Use Reduction Institute




Surface Solutions Laboratory

Trial Report



Trial Number 4

(Client Number 280, Project Number 1)

Trial Purpose: To evaluate successful alternatives on fourth supplied contaminant.

Date Run: 05/16/07

Experiment Procedure:
Five products from the previous trial were selected and used at full strength based on past performance. The cleaning solutions were all heated to 130 F on a hot plate.

Fifteen preweighed alloy coupons were coated with the fourth contaminant and weighed a second time to determine the amount of contaminant added to each coupon. Three coupons were immersed into each solution and cleaned for 5 minutes using stir-bar agitation. Coupons were rinsed in room temperature tap water for 15 seconds and air dried using compressed dry air for 30 seconds. A final weight was recorded and efficiencies were calculated for each coupon cleaned.

Trial Results
Two of the five products appeared to be visually effective in removing the coating compound. However, gravimetric analysis revealed that no product
had an efficiency greater than 35%. Upon closer inspection, one product removed most of the coating but left a residue from the cleaner on the
coupons, thus lowering efficiency. When the coupons were wiped with a paper towel, efficiency increased to over 80% removal. When wiped, the coating
on the second visually clean product was easily removed, increasing efficiency to nearly 80%.
The other products all head negative efficiencies. This was due to both cleaner residue and the coating absorbing the cleaning solution, increasing
the weights of the coupons above the initial contaminated weights.

The cleaning effectiveness for all products could be improved by increasing temperature, time or agitation (ultrasonics or spray washing). The table
below lists the amount of soil added, the amount remaining and the efficiency for each coupon cleaned.

Cleaner             Initial wt      Final wt        % Removed
Soy Gold 1100        0.0208          0.0340          -63.46
                     0.0613          0.0805          -31.32
                     0.0435          0.0759          -74.48
Solsafe 245          0.0640          0.0829          -29.53
                     0.0522          0.0757          -45.02
                     0.0432          0.0582          -34.72
Shopmaster RC        0.0504          0.0466            7.54
                     0.0542          0.0260           52.03
                     0.0504          0.0268           46.83
DS 108               0.0430          0.0694          -61.40
                     0.0704          0.1120          -59.09
                     0.0489          0.0527           -7.77
D Greeze 500 LO      0.6509          0.7401          -13.70
                     0.0495          0.1255          -153.54
                     0.0536          0.1284          -139.55

Shopmaster RC w/wipe 0.0504          0.0144          71.43
                     0.0542          0.0092          83.03
                     0.0504          0.0048          90.48
DS 108 w/wipe        0.0430          0.0111          74.19
                     0.0704          0.0123          82.53
                     0.0489          0.0102          79.14


Success Rating
Results suggest a scale-up feasible match for cleaning chemistry and equipment. Pilot plant study with actual parts recommended.

Conclusion
All five product should be retested using increased mechanical agitation (ultrasonics) or higher temperature (150F) in an attempt to improve efficiency. The same five products will be used on the sixth supplied contaminant.

The fifth contaminant was skipped as it was very similar to the fourth contaminant. This contaminant can be tested in the next set of trials.