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Trial Number 10

Trial Purpose:

To evaluate supplied products using a low flow rinse.

Date Run:


Experiment Procedure:

A lime/water slurry was made by mixing 20 grams of calcium carbonate in 100 milliliters of DI water. The solution was mixed to suspend the calcium carbonate in the water. A plastic swab was used to apply the slurry mix onto nine preweighed mirrored glass coupons. The coated coupons were allowed to dry at room temperature. After the slurry mix was dried, the coupons were weighed again to determine the amount of calcium carbonate that was applied to the coupons. Three coupons were immersed into a 400 ml beaker filled with the supplied cleaning products. The coupons were allowed to sit in the solution for 5 minutes with stir bar agitation at room temperature. In addition to the two supplied cleaners, a beaker with only water was used. At the end of the soaking, the coupons were rinsed in a heated tap water spray from the faucet (120 F) and then were dried using compressed air for 15 seconds at room temperature. Once dry, visual observations were made and the coupons were weighed a final time. Removal efficiencies for each product was calculated.

Trial Results:

The tap water spray rinse helped to reduce the amount of residue remaining after cleaning the coupons. The coupons cleaned with the two supplied products looked cleaner than the coupons cleaned with water. The table lists the amount of contaminant added, the amount remaining and the efficiency for each coupon. Photos of the cleaned coupons are also included.

Cleaner Initial wt Final wt % Removed
DFC 23 0.1179 0.0012 98.98
  0.0634 0.0021 96.69
  0.2218 0.0055 97.52
DFC 30 0.1632 0.0034 97.92
  0.2088 0.0031 98.52
  0.1008 0.0056 94.44
Water 0.2095 0.0008 99.62
  0.3660 0.0000 100.00
  0.1637 0.0015 99.08

Success Rating:

A follow up test, usually based on company input.


Both DFC 23 and DFC 30 do remove the calcium carbonate, but special attention needs to be given to the removal of the cleaner residue that remains after cleaning.

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