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Trial Number 2

Client Number 61

Project Number 1

Trial Purpose:

Determine if temperature would aid cleaners

Date Run:

06/03/1998

Experiment Procedure:

The same three oils were used to contaminate the pre-weighed aluminum coupons. The coupons were placed in an oven for 20 minutes at 160 F. Coupons were allowed to cool to room temperature and weighed again. Three coupons were placed in each cleaner for two minutes with stir bar agitation at 130 F. Coupons were then rinsed in tap water for 30 seconds also at room temperature. Parts were air-dried and then weighed one more time.

SUBSTRATE MATERIAL: Al-202-6061 T-4
CONTAMINANTS: Citgo Cutting Oils 425 & 120, Sliderite 220

Trial Results:

Table 1 list the cleaning efficiencies of the three aqueous cleaners at the elevated temperatures. The two WR Grace products increased their effectiveness, and the Safe CleanUp product showed no signs of improving.

Table 1 Cleaning Efficiencies

@ 130 deg F Daraclean Daraclean Safe Clean Up
  282 232          SupNeut
Coupon 1 84.3 68.7 92.9
Coupon 2 59.2 86.8 87.7
Coupon 3 72.4 82.9 87.9
Average 72 79.5 89.5
Std Dev 12.6 9.53 2.95

Table 2 compares the cleaning efficiencies of the heated and unheated aqueous cleaners from trials 2 and 3.

Table 2 Comparison of Cleaning Efficiencies

CLEANER Efficiency @ Room Temp Efficiency @ 130 deg F
WR Grace Daraclean 282 62.8 72.0
WR Grace Daraclean 232 45.2 79.5
Safe CleanUp Super Neutral 90.7 89.5

The Daraclean 232 had the greatest increase when heated, up almost 35%, followed by the 282, up about 10%, and the Super-Neutral down slightly.

Success Rating:

A follow up test, usually based on company input.

Conclusion:

Temperature helped to increase the efficiency of two aqueous cleaners.  The increased efficiencies were still lower than the third cleaner.

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