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Trial Number 1

Client Number 153

Project Number 8

Trial Purpose:

To test the removal of buffing compound by the first 8 selected HSPiP formulations.

Date Run:

03/10/2022

Experiment Procedure:

For silver bullet testing approximately 32 chemical combinations were determined via HSPiP. The first predetermined solvent combinations were selected based on their initial solvent in common. In this case, the eight chosen all contained D-limonene.

  • Solvent 1 (91% D-limonene and 9% Acetone)
  • Solvent 2 (67% D-limonene and 33% Benzyl Benzoate)
  • Solvent 3 (85% D-limonene and 15% Dimethyl Glutarate)
  • Solvent 4 (92% D-limonene and 8% 1-Propanol)
  • Solvent 5 (48% D-limonene, 38% Benzyl Benzoate, and 14% Sec-Butyl Acetate)
  • Solvent 6 (85% D-limonene, 14% Dimethyl Glutarate, and 1% Sec-Butyl Acetate)
  • Solvent 7 (60% D-limonene, 31% Benzyl Benzoate, and 9% Dimethyl Glutarate)
  • Solvent 8 (83% D-limonene, 16% Benzyl Alcohol, and 1% Dimethyl Glutarate)

All mixtures were tested as compatible with both stainless steel and aluminum. The initial contaminant to be tested with these 8 solvents was a buffing compound. Several trials were conducted to determine how to best coat the stainless steel coupons with the buffing compound evenly. Buffing compound is solid at room temperature and melts at temperatures 100F and up. Once heated it has a consistency similar to peanut butter. Unless heat is maintained the contaminant will return to its solid state very rapidly. Coupons were weighed prior to application. For application, the buffing compound was heated with a heat gun until it began to melt and the bottom 1/3rd of the coupons were coated using a knife. The coupons were then weighed again.

Testing was attempted using heated immersion and agitation. Testing began with heated immersion for 15 minutes. All 8 solvents were heated to 38°C (~100°F) in separate beakers each with a stir bar. Coupons were then immersed for 15 minutes and taken out to dry overnight. Clean weights were then taken the next day.

Trial Results:

Overall, solvents 1,3,4,6, and 8 were the most successful at removing the contaminant from the coupons. All had overall averages of 99% and above and were visually clean.

Solvent Initial Dirty Clean %Cont Removed % Average
1 59.8741 60.6385 59.8889 98.06 99.16
64.2479 65.2430 64.2510 99.69
62.5696 63.8546 62.5730 99.74
2 59.5571 60.6692 59.5717 98.69 74.67
62.6273 63.7148 63.0858 57.84
48.0669 49.2687 48.4576 67.49
3 61.4056 62.7620 61.4115 99.57 99.48
63.8754 65.2828 63.8815 99.57
60.8231 62.0487 60.8314 99.32
4 63.6883 64.6625 63.6970 99.11 99.53
60.6820 62.1820 60.6882 99.59
61.2520 62.4503 61.2534 99.88
5 60.3449 62.1062 61.8450 14.83 44.16
63.8987 65.3898 63.9122 99.09
61.3968 62.8461 62.5771 18.56
6 61.2200 62.2431 61.2271 99.31 99.55
61.5231 62.9318 61.5230 100.01
61.5559 62.7099 61.5634 99.35
7 61.6283 62.5399 61.6525 97.35 75.74
47.9741 49.1548 48.7189 36.92
48.1116 49.0016 48.1742 92.97
8 48.1274 49.7392 48.1395 99.25 99.56
61.4065 62.6406 61.4100 99.72
60.7791 62.0579 60.7827 99.72

Success Rating:

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

Conclusion:

Solvents 1,3,4,6, and 8 were extremely efficient at removing the contaminant from the stainless steel coupons. The next step using these 8 cleaners would be to either begin testing on another substrate or to switch contaminants.

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