Trial #10
To evaluate supplied products using a low flow rinse.
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.
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
|
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.
No relation