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




Surface Solutions Laboratory

Trial Report



Trial Number 8

(Client Number 318, Project Number 1)

Trial Purpose: To evaluate supplied products for presoaking capabilities for manual dishwashing.

Date Run: 04/27/10

Experiment Procedure:
Preweighed stainless steel coupons were coated with a modified Hucker's soil and then placed in a conventional oven at 100 F for 2 hours. Dirty weights were recorded after the coupons cooled to room temperature. One set of coupons were cleaned

Three coupons were placed into a Gardner Straight Line Washability unit. A Kimberly-Clark Wypal reinforced paper towel was attached to the cleaning sled and soaked with 5-7 sprays of cleaning solutions. Each coupon was sprayed 7-10 times with the same cleaning solution. The cleaning unit was run for 20 cycles (~33 seconds). At the end of the cleaning, coupons were wiped once with a dry paper towel. Final weights were recorded, efficiencies were calculated and recorded.

A second set of soiled coupons were first immersed into the cleaning solutions for 10 minutes and then cleaned following the manual cleaning process. Results were compared for each methodology.

The two client supplied products were diluted according to recommendations using DI water (0.8 and 0.13). A comparative product was used at the 0.1% dilution recommended by the ASTM 4009 for foam stability in manual cleaning. Water also was used.

Trial Results
The two supplied products were more effective at removing the Hucker?s soil from the three surfaces using the presoaking with manual wiping. Dawn and
water both had lower efficiency after soaking than manual cleaning alone. The table lists the amount of soil added, the amount remaining after
cleaning and the calculated efficiency for each coupon cleaned.

Cleaner        Initial wt        Final wt        % Removed
Alpha Chemical Liquid presoak 0.8% (presoaking)                        
        0.0337        0.0016        95.25
        0.0566        0.0028        95.05
        0.0289        0.0029        89.97
Alpha Chemical Solid presoak 0.3% (presoaking)                        
        0.0283        0.0056        80.21
        0.0777        0.0086        88.93
        0.0612        0.0044        92.81
Dawn cleaner 0.1 % (presoaking)                        
        0.0278        0.0122        56.12
        0.1104        0.0057        94.84
        0.0675        0.0036        94.67
Water 100% (presoaking)                        
        0.0549        0.0142        74.13
        0.1523        0.0272        82.14
        0.0663        0.0152        77.07
Alpha Chemical Liquid presoak 0.8% (non-presoaking)                        
        0.2667        0.0160        94.00
        0.0267        0.0025        90.64
        0.0294        0.0043        85.37
Alpha Chemical Solid   presoak 0.3% (non-presoaking)                        
        0.0324        0.0077        76.23
        0.0377        0.0111        70.56
        0.0537        0.0103        80.82
Dawn cleaner 0.1 % (non-presoaking)                        
        0.0609        0.0068        88.83
        0.0379        0.0071        81.27
        0.1227        0.0148        87.94
water 100% (non-presoaking)                        
        0.0833        0.0352        57.74
        2.0382        0.0066        99.68
        0.0286        0.0059        79.37


Success Rating
A follow up test, usually based on company input.

Conclusion
The supplied presoak products removed over 85% of the aged soil. Both worked better than water or Dawn and better than cleaning without a presoak.