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Trial Number 46

Client Number 232

Project Number 1

Trial Purpose:

To evaluate requested products for automatic dish washing.

Date Run:

10/26/2007

Experiment Procedure:

Three substrates, stainless steel, plastic and glass, were selected to represent possible materials that would be cleaned in a dishwasher. Three cleaning products were tested and compared to each other and to water. Each product was added to the Maytag home dishwasher so that the dispenser was half full. Each substrate was contaminated with a 50:50 mix of Hucker's soil and SSL’s kitchen soil using a hand held swab and allowed to sit for 24 hours. A second set of weights were recorded to determine the amount of soil added to each coupon. In addition to the coated coupons, three uncontaminated coupons were included in the washing cycle as a way to determine re-deposition of the contaminant onto the surface of the coupons. The cleaning cycle operated at 160 F and run for hour and half. At the end of the cleaning/ rinsing/ drying, the coupons were removed from the unit, final weights were recorded and efficiencies calculated.

Trial Results:

Two of the products were successful in removing the hucker-kitchen soil mix from the three substrates. When tested with water alone, only 60% of the soil was removed. In addition, the plastic coupons, when washed with water alone came out looking grey and were coated on both sides with a thin layer of the soil mix. The table lists the amount of soil added, the amount remaining, the efficiency for each coupon cleaned and the average removal from each substrate type.

Cleaner Initial wt Final wt % Removed Substrate Ave Product Average
Cascade gl 0.1431 -0.0011 100.77 100.74 96.48
  0.1830 0.0042 97.70    
  0.1011 -0.0038 103.76    
Cascade pl 0.1644 0.0107 93.49 89.22  
  0.1204 0.0220 81.73    
  0.2371 0.0179 92.45    
Cascade ss 0.4048 -0.0005 100.12 99.46  
  0.3528 0.0000 100.00    
  0.4298 0.0075 98.26    
Seventh gl 0.2876 0.0001 99.97 100.48 83.57
  0.1273 -0.0013 101.02    
  0.0891 -0.0004 100.45    
Seventh pl 0.1640 0.0181 88.96 57.51  
  0.1468 0.0814 44.55    
  0.1305 0.0796 39.00    
Seventh ss 0.2521 0.0412 83.66 92.74  
  0.1269 0.0003 99.76    
  0.1440 0.0075 94.79    
DFC gl 0.1574 -0.0006 100.38 96.99 88.42
  0.1219 0.0123 89.91    
  0.1199 -0.0008 100.67    
DFC pl 0.0975 0.0334 65.74 68.95  
  0.1131 0.0552 51.19    
  0.1408 0.0142 89.91    
DFC ss 0.1747 0.0017 99.03 99.33  
  0.2520 0.0009 99.64    
  0.1351 0.0009 99.33    
  0.1800 0.0977 45.72 46.12 61.71
  0.1301 0.0973 25.21    
  0.3624 0.1180 67.44    
  0.2284 0.0102 95.53 80.68  
  0.3432 0.1572 54.20    
  0.2505 0.0193 92.30    

Blank samples weight changes were measured using a unsoiled coupon cleaned along with the contaminated coupons. Only the plastic coupons had an noticeable increase in weights. The weight change and percent change are listed in the table below.

water pl 0.1800 0.0977 45.72 46.12 61.71
  0.1301 0.0973 25.21    
  0.3624 0.1180 67.44    
water gl 0.2284 0.0102 95.53 80.68  
  0.3432 0.1572 54.20    
  0.2505 0.0193 92.30    
water ss 0.2041 0.0940 53.94 58.32  
  0.1435 0.0594 58.61    
  0.1916 0.0720 62.42    

Success Rating:

A follow up test, usually based on company input.

Conclusion:

Cascade and DFC GPC Polish removed over 85% of the soil mix using spray washing and did not resoil the coupons during the washing process. Water alone resulted in the plastic coupons becoming resoiled.

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