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Trial Number 10

Trial Purpose:

To find a cleaning solution that will work in a high pressure spray wash system for cleaning tanker trucks.

Date Run:

06/17/1999

Experiment Procedure:

Seven cleaners were selected on vendor supplied information and from the lab’s Effective Test Conditions Database of past trials. The chemistries were then diluted to 10% (except one) by volume using DI water in 1000 mL Pyrex beakers.
Twenty-one preweighed coupons were contaminated and weighed again. Three coupons were cleaned in each cleaner for ten minutes using stir-bar agitation. Coupons were rinsed in a tap water bath for 30 seconds at 120 F and then allowed to air dry for two hours. Final weights were recorded and cleaning efficiencies calculated.
SUBSTRATE MATERIAL: Stainless Steel coupons (316 B-80)
CONTAMINANTS: Solutia Gelva Multipolymer Resin Solution 2895 (CAS#s: 50862-46-9; 141-78-6; 142-82-5; 67-63-0; 64-17-5; 108-05-4)
CONTAMINATING PROCESS USED: Coupons were coated with contaminant with a hand held swab. Coupons were then allowed to dry for one hour.

Trial Results:

During the cleaning cycle, none of the cleaners appeared to work very well at the dilutions used. After calculating the cleaning efficiencies, very little of the contaminant was removed. Table 2 lists the calculated efficiencies for each cleaner.

 

Table 2.  Cleaning Efficiencies          
  AW Chesterton Buckeye Envirosolutions Oakite T-Square AG Environmental Savogran
Coupon 1 4.54 1.93 11.40 -6.00 1.05 8.78 9.96
Coupon 2 15.25 8.17 11.13 2.34 -6.36 3.73 11.83
Coupon 3 12.17 3.84 6.97 5.77 -0.19 -1.09 6.48
Ave 10.65 4.65 9.84 0.70 -1.83 3.81 9.42
Std Dev 5.52 3.20 2.48 6.05 3.97 4.94 2.72

Success Rating:

Test incomplete or inconclusive.

Conclusion:

The three products with the efficiencies around 10 (AW Chesterton, Envirosolutions and Savogran) and the one product with the negative removal (T-Square) will all be retested at full strength.

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