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Trial Number 2

Trial Purpose:

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 130 oF 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, a 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

 

70.6422

 

79.18552

 

39.41128

 

89.59108

 

93.74674

 

86.9863

 

89.93808

 

78.89908

 

88.39104

 

Coupon 2

 

94.30693

 

94.10745

 

79.84962

 

90.33413

 

93.57466

 

93.17618

 

97.05414

 

82.8125

 

62.84875

 

Coupon 3

 

81.96078

 

92.39641

 

56.87799

 

87.251

 

93.412

 

66.46884

 

81.76944

 

96.78571

 

64.46078

 

Ave

 

82.30331

 

88.56313

 

58.71297

 

89.05873

 

93.5778

 

82.21044

 

89.58722

 

86.16577

 

71.90019

 

Std Dev

 

11.83608

 

8.166184

 

20.28152

 

1.609027

 

0.167396

 

13.97952

 

7.64839

 

9.402988

 

14.30422

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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