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Trial Number 4

Trial Purpose:

To evaluate selected cleaners on supplied parts using immersion cleaning.

Date Run:

10/17/2006

Experiment Procedure:

Two alternative products were selected from the previous trial based on effectiveness. Each product was diluted to 10% in 250 ml beakers using DI water and heated to 130 F on a hot plate.
Several silver, brass and copper parts were received coated with various buffing compounds. Six parts were cleaned in each solution for five minutes using minimal stir bar agitation. Parts were rinsed for 15 seconds in a tap water bath at 120 F and dried using a dry compressed air for 30 seconds. Once dry, a final observation was made to assess cleanliness.

Trial Results:

Cleaner Part Observation
Polyspray Jet 790 XS Silver Broach Not completely clean
  Silver Bracelet Looked clean
  Silver container Not completely clean
  Silver dolphins Mostly clean
  Silver "coin" Mostly clean
  Brass Jesus Not completely clean
     
Detergent 8 Silver money clip Not completely clean
  Silver Marine pin Looked clean
  Silver Ornament Looked clean
  Silver Jesus Looked clean
  Copper fixture Mostly clean
  Brass medal Not completely clean

Success Rating:

Test incomplete or inconclusive.

Conclusion:

Both cleaning solutions had some success in cleaning the supplied parts. However, not all parts were completely cleaned. Parts have been sent back to the client for analysis.

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