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To evaluate selected cleaners for the removal of graphite based colloidal mold release agent.
Seven products were selected based on similar testing from the laboratory's database of test results. Five alkaline products were diluted to 5% using DI water in 600 ml beakers. Two acidic products were also selected. One product was diluted to 6% and the second was diluted to 20% based on vendor recommended concentrations. Water was also evaluated. All eight beakers were heated to 130 F on a hot plate.
Eighteen preweighed aluminum coupons were coated with the Acheson Colloids Co Aquadag M mold release agent (CAS#: 7782-42-5, 84122-50-6, 70131-67-8, 1333-86-4, 107-21-1, 9002-84-0). The mold release was initially dried for 5 minutes using a Master Appliance Heat Gun at 500 F. The coupons were then subjected to another 10 minutes of drying. Coupons were allowed to sit overnight, followed by 2 hours of drying in an oven at 500 F. After the drying, coupons were allowed to cool to room temperature and weighed a second time to determine the amount of soil added to the coupons.
Three coupons were cleaned in each solution for 5 minutes using stir-bar agitation. Coupons were rinsed in a tap water bath for 15 seconds at 120 F and dried using compressed air blow off at room temperature for 30 seconds. Final weights were recorded and efficiencies were calculated.
A couple of products removed over 50% of the soil and another three removed over 20%. The table below lists the amount of soil added, the amount remaining and the efficiency for each coupon.
|Cleaner||Initial wt||Final wt||% Removed|
|SC Aircraft & Metal||0.0027||0.0027||0.00|
|Polyspary Jet 790 P||0.0112||0.0090||19.64|
Success Rating:Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
The five products that showed some cleaning will be retested using ultrasonic cleaning.