Trial Number 4

The one chemistry was made into 1, 3 and 5% solutions using DI water in 400 mL beakers. These solutions were then heated to 130 F on a hot plate. Nine preweighed coupons were contaminated with the metal working fluid supplied by the client. Coupons were weighed after contamination. Three coupons were cleaned in each solution for three minutes using stir-bar agitation, then rinsed for 30 seconds in a tap water bath at 120 F. Drying was performed using Master Appliance Corp, Hot-air gun model HG-301A at 500 F for one minute. Final weights were recorded and cleaning efficiencies were calculated.

SUBSTRATE MATERIAL: 304 Stainless Steel coupons
CONTAMINANTS: Metal working fluid (Hangsterfer’s S-500CF_US)

All three concentrations were very effective in removing the contaminant from the stainless-steel surface.  Efficiencies ranged from 98.5 to 102%.  It was noted that when the coupons were submerged into the rinse water, a noticeable amount of the cleaning solution was still on the coupon.  The level was higher for the lower dilutions.  Table 1 list the efficiencies for the three concentrations tested.

Table 1.  Cleaning Efficiencies

Table 2 compares the cleaning efficiencies of previously tested cleaners with Brulin 815 GD. The Brulin product performed better than all of the other cleaners at each concentration except at 1% where Warren chemical was slightly more efficient.

Table 2. Comparison of Average Cleaning Efficiencies

The Brulin product was determined to remove the contaminant at each of the three concentrations tested.