To find a cleaning chemistry that would eliminate the flaking of the contaminant after the cleaning cycle.
Date Run:
07/09/1998
Experiment Procedure:
Nine cleaners were selected from SCL’s databases based on previous uses and vendor information. Five percent solutions were made into 500 mL beakers using DI water. The solutions were heated to 130oF on a hotplate.
Pre-weighed coupons were contaminated by being placed into the contaminant container. The coupons soaked for 40 minutes. At the end of the soaking, coupons sat for an additional 30 minutes at ambient conditions. Contaminated coupon weights were recorded. Three coupons were placed into each cleaner for five minutes with stir-bar agitation. Coupons were rinsed for 30 seconds in tap water at 120 F. Parts were air dried using compressed air at room temperature. Once the coupons were dry, final weights were obtained.
SUBSTRATE MATERIAL: Stainless Steel
CONTAMINANTS: Formaldehyde Based Resin CONTAMINATING PROCESS USED: Coupons soaked in the contaminant for 40 minutes.
Trial Results:
Table-1 lists the cleaning efficiencies of each of the products tested. Several products removed 85% or better.
Table-1. Cleaner Efficiencies
Buckeye
Chrisal
Star
WR Grace
Gemtek
EMKAY
T-Square
CSA Inc
Chesterton
Coupon 1
70.64
79.18
39.41
89.59
93.75
86.99
89.94
78.90
88.39
Coupon 2
94.31
94.11
79.85
90.33
93.58
93.18
97.05
82.81
62.85
Coupon 3
81.96
92.40
56.88
87.25
93.41
66.47
81.77
96.78
64.46
Ave
82.30
88.563
58.72
89.06
93.58
82.21
89.58
86.16
71.90
Std Dev
11.84
8.17
20.28
1.61
0.17
13.98
7.65
9.40
14.30
The most consistent and effective cleaner tested was Gemtek SC-1000, followed closely by T-Square, WR Grace and Chrisal. The coupons cleaned with Gemtek had little flaking develop after rinsing and drying. Improved operating conditions (pressure, longer cleaning time, etc.) could improve the efficiencies of these cleaners, thus lowering the amount of flaking even further.
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
Three cleaning chemistries removed 90% of the contaminant after a five-minute soak. Even though the cleaners were tested with immersion cleaning, the chemistries can be used in a high-pressure system. Other adjustments to the testing conditions may yield higher cleaning efficiencies.
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