Trial Number 3

One set of preweighed stainless steel and wood coupons were coated with Dayetek Daye Black quick dry lithographic ink using a handheld swab. A second set of preweighed stainless steel and wood coupons were coated with Barnes Group Bowman Distribution Industrial Finish Gloss Black spray paint No 24700. Coated coupons were allowed to sit for several hours for drying of applied ink/paint. Once dry, coupons were weighed to determine the amount of contamination that was applied.

Three coupons were placed into a Gardner Straight Line Washability unit. A Kimberly-Clark Wypal reinforced paper towel was attached to the cleaning sled and soaked with 5-7 sprays of cleaning solutions. Each coupon was sprayed 7-10 times with the same cleaning solution. The cleaning unit was run for 20 cycles (~33 seconds). At the end of cleaning, final weights were recorded, and efficiencies were calculated.

The SG22002D was the more effective solvent on the paint from stainless steel and the 50/50 mix with SG21000D and SG22002D was almost as effective as the DBE on the ink from stainless steel.

Gravimetric analysis was inconclusive for both soils from the wood coupons due to weight gain in the final "clean" weights. The previous trial showed that SG21000D was the more effective cleaner on the ink and the SG22002D for the paint. The table lists the amount of soil added, the amount remaining and the efficiency for each coupon.

Summary

The supplied solvents were again shown to have success at removing ink and paint using a short dwell time through manual cleaning.