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Trial Number 1

Client Number 161

Project Number 1

Trial Purpose:

To evaluate cleaners using longer times and elevated temperature

Date Run:

11/27/2001

Experiment 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.

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