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Trial Number 12

Trial Purpose:

To evaluate effect on marble substrate through overnight immersion.

Date Run:

08/04/2005

Experiment Procedure:

Several marble chips of similar size and shape were weighed to determine the baseline weight of each piece. The selected chips were then immersed in the two supplied products at full strength as well as a tap water bath and allowed to sit overnight. After soaking at room temperature for 18 hours, the marble chips were removed from the products and rinsed in a tap water spray at 120 F for 3 minutes to remove loose material from the chips. Then the chips were dried for 15 minutes using a Master Appliance Heat gun at 300 F. When the chips cooled to room temperature, final weights were recorded to determine weight loss, if any. Parts were then allowed to air dry for 72 hours and weighed again to determine if all the moisture had been removed from the chips. Observations were made and photographs were taken after the initial immersion of the chips into solutions (5 minutes), at 60 minutes and then following the overnight immersion.

Trial Results:

From visual observations the two supplied solutions appeared to effect the marble chips. During the soak, the two supplied solutions started to bubble. This bubbling was more vigorous after 60 minutes of soaking. The solutions overflowed the beaker overnight. Both solutions shifted from being transparent to opaque overnight. The water beaker had no signs of interacting with the marble. The photos of the beakers show the status at 5 minutes, 60 minutes and 18 hours. In addition to the beakers, there are photographs showing the baseline marble chips, the 18 hour soaks for DFC 23, DFC 30 and water. Both DFC 23 and DFC 30 resulted in more than 5% loss in weight after soaking. The water had an average loss of 0.06%. The extended drying time of 72 hours did not change the final weights of the marble chips. The table lists the initial weight, final weight and weight change for each marble chip soaked.

Product Initial wt Final wt % Wt loss
DFC 23 22.5369 20.7137 8.09
  30.6078 28.7485 6.07
  22.7806 21.6803 4.83
  29.4623 27.5022 6.65
DFC 30 23.8107 22.2973 6.36
  17.6874 16.6576 5.82
  30.6460 29.3322 4.29
  32.8858 31.2474 4.98
Water 16.5910 16.5813 0.06
  17.0030 16.9947 0.05
  12.3762 12.3675 0.07
  16.0933 16.0808 0.08

Success Rating:

A cleanliness study, addressing only various analytical techniques.

Conclusion:

The two DFC products decreased the weight of the marble chips by more than 5%, indicating dissolving of the calcium in the marble.

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