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Trial Number 1

Trial Purpose:

To further test the cleaners from the previous trial.

Date Run:

09/14/1998

Experiment Procedure:

Twelve preweighed coupons were contaminated with the sealant using a hand-held swab. Coupons were reweighed after sealant had dried.
Four cleaning chemistries were selected from the previous test based on cleaning efficiencies. Glass petri dishes, 4" diameter, were filled 1/3 full with each cleaner at 100% concentration. The dishes were heated to 130 F on a hot plate. One coupon was placed in the dish at a time and soaked at room temperature for 3 minutes. At the end of the soaking, the coupon was removed and wiped for 1 minute with a paper towel. Coupons were air dried and weighed to obtain their clean weights. Cleaning efficiencies were then calculated.

SUBSTRATE MATERIAL: Aluminum (Al 202-50552 H-32)
CONTAMINANTS: Acrylic Sealant-Aromatic Hydrocarbon (Toluene CAS# 108-88-3)

Trial Results:

A couple of the cleaners benefited from the increased temperatures. Others showed little or no improvement. Table 1 list the cleaning efficiencies of the four chemistries tested.

Table 1. Cleaning Efficiencies at 130 deg F

  HTF 85 B Citrisolv Luminox Soy Gold
Coupon 1 97.9 19.07 63 49.04
Coupon 2 99.6 56.1 36.39 75.16
Coupon 3 83.67 74.02 49.67 44.42
Average 93.72 49.73 49.69 56.21

The second table takes the average cleaner efficiency from both trials and compares them to each other.

Table 2. Comparison of Cleaning Efficiencies

  HTF 85 B Citrisolv Luminox Soy Gold
Trial 1 42.2 43.82 6.941 30.68
Trial 2 93.72 49.73 49.69 56.21

Both HTF 85 B and Luminox increased with the addition heat whereas Citrisolv and Soy Gold had marginal increases.

Success Rating:

Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.

Conclusion:

The T-Square sample had over 90% removal of the contaminant when heated to 130 F.  The next phase of testing will involve the customer supplied painted parts. Compatibility of HTF 85 B with the paint will be examined.  The MSDS of HTF 85 B has been included with this report.

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