Trial Purpose:
To evaluate cleaners using longer times and elevated temperature
Date Run:
11/27/2001Experiment Procedure:
Three products from the previous trial were diluted to 20% using DI water in 1000 ml beakers. A fourth solution was used a full strength. All four products were heated to 140 F on a hot plate. One part was immersed half way into the solutions and cleaned for 20 minutes. At the end of cleaning the parts were rinsed with tap water at 120 F for 5 minutes. Parts were allowed to air dry. Observations were made at the 10 and 20 minutes. Contaminant: White powders (SiO2, NHCl, (NH4)2SiF6, or NH4HF2)
Trial Results:
Three of the four products were moderately successful after the 20 minute soaking. The DS 108 was not very effective. The following table lists observations made at T = 0, 10 and 20 minutes.
Table 1. Cleaning Observations
| Cleaner | T = 0 | T = 10 | T = 20 |
| 1 | Instantly cloudy | Very dark and cloudy. Still white powder in holes | White and crusty. Holes mostly clean |
| 2 | Slowly clouding up | Cloudy grey. Flat sides look clean. Round edges white | White and flaky. Good hole cleaning |
| 3 | Slowly clouding up | Cloudy. White still on part | White and crusty. Good hole cleaning |
| 4 | Slowly clouding up | Not very cloudy. White still on part | Lots of white still on part. OK hole cleaning |
Success Rating:
A follow up test, usually based on company input.Conclusion:
The three successful products will be evaluated in the next trial using ultrasonic energy.
