The top two products from the previous trials were diluted with DI water to two concentrations, 5 and 2.5%. The products were then heated to 200 F on a hot plate. The client's current cleaner was also used at 3% at the same temperature.
Fifteen preweighed stainless steel coupons were coated with the supplied cotton seed oil/starch mix and allowed to sit for 24 hours. Coupons were then weighed a second time to determine the amount of soil that was added. Three coupons were cleaned in each product for sixty minutes with no agitation. Cleaning was followed by a 15 second rinse in a tap water bath at 120 F and air blow off for 30 seconds at room temperature. Once dry, coupons were weighed a third time and efficiencies were calculated for each product tested.
The Organic Cleaner/Degreaser at both concentrations worked as well as the client's current cleaner, removing over 98% of the oil after an hour of soaking at 200 F. Both concentrations of VPW SC1000 removed over 96% of the oil/starch mix. The table below lists the amount of soil added, the amount remaining and the percent removed for each coupon cleaned.
| Cleaner
|
Initial wt
|
Final wt
|
% Removed
|
| Liquid Chembrite
|
0.4222
|
0.0003
|
99.93
|
|
|
0.2230
|
0.0037
|
98.34
|
|
|
0.3036
|
0.0022
|
99.28
|
| Organic D/C 5%
|
0.3765
|
0.0016
|
99.58
|
|
|
0.3343
|
0.0036
|
98.92
|
|
|
0.3145
|
0.0026
|
99.17
|
| Organic D/C 2.5%
|
0.1925
|
0.0013
|
99.32
|
|
|
0.3677
|
0.0032
|
99.13
|
|
|
0.1455
|
0.0021
|
98.56
|
| VPW SC 1000 5%
|
0.4527
|
0.0094
|
97.92
|
|
|
0.3108
|
0.0157
|
94.95
|
|
|
0.3669
|
0.0073
|
98.01
|
| VPW SC 1000 2.5%
|
0.3897
|
0.0070
|
98.20
|
|
|
0.3775
|
0.0168
|
95.55
|
|
|
0.4202
|
0.0128
|
96.95
|