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Trial Number 9

Trial Purpose:

To find cleaner that can dissolve adhesive for replacement of Methylene Chloride.

Date Run:

05/07/1999

Experiment Procedure:

Small sections of the contaminant (~0.5g) were placed into 40 mL vials. Each vial was filled with a cleaning solution selected based on past performance with similar contaminant make-up. Cleaners were selected using the Lab’s Effective Tests Conditions database and from vendor supplied information. Full strength solutions (except one) were used at room temperature. Observations were made at five intervals over three days both visual and by tactile methods.
SUBSTRATE MATERIAL: None
CONTAMINANTS: Ashland Chemical Co Aroset 601 (CAS#s: 141-78-6, 67-63-0, 108-88-3, 103-11-7, 141-32-2)

Trial Results:

Three cleaners showed goods signs of being able to dissolve the contaminant.  Most of the cleaners had some effect on the adhesive, reducing the stickiness after an hour of soaking.  Table 1 lists the observations made for each cleaner at the five-time intervals.

Table 1.  Visual and Tactile Observations

Time (min) 1 2 3 4 5 6 7
5 No change No Change No Change No Change No Change Floating No Change
30 Floating On Bottom On Bottom On Bottom Floating No Change Light Yellow
60 Less Sticky Mushy Less Sticky Mushy No Change Mushy Mushy-not sticky
120 No Change More Mushy No Change More Mushy Slightly Mushy Mushy No Change
4320 Cloudy Very Mushy Some Cloudiness Very Mushy No Change No Change Very Mushy

Success Rating:

Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.

Conclusion:

Envirosoluitons Solsafe 245, AG Environmental Soy Gold 2000 and Savogran SI No 4 were all effective in dissolving the adhesive after three days of soaking.  All three did show signs of dissolving the adhesive after an hour of soaking at room temperature.

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