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Trial Number 5

Trial Purpose:

To determine if the brown gunk contaminant would change the OSEE readings differently than the metal working fluid.

Date Run:

04/30/1999

Experiment Procedure:

OSEE readings were taken from a clean coupon. The metal working fluid was centrifuged for five minutes at about 1000 rpm using a Fisher Scientific Centrific Centrifuge Model 225. A plastic eye dropper was immersed to the bottom of the test tube and the metal working fluid was withdrawn. The metal working fluid was then placed on the coupon (upper section) and wiped with a hand held swab. OSEE readings of the coupon and metal working fluid were recorded. A second eye dropper was used to withdraw the brown gunk from the top of the test tube and placed on the coupon (lower section) and wiped with a new hand held swab. OSEE readings were measured for the coupon and brown gunk.
SUBSTRATE MATERIAL: Molybdenum coupon
CONTAMINANTS: Metal working fluid (Hangsterfer’s S-500CF_US) & Brown gunk
CONTAMINATING PROCESS USED: After initial OSSE readings, parts contaminant was wiped on using swab.

Trial Results:

Both contaminant OSEE readings were found to decrease from the original clean coupon values. The brown gunk lowered the readings less than the metal working fluid. Table 1 lists the readings obtained for each contaminant and the averages and standard deviations.
Table 1. OSEE Readings Verification

Table 1.  OSEE Readings Verification    
  Clean Readings Metal Working fluid Brown Contaminant
  203 169 184
  220 173 197
  230 176 201
  232 184 205
  222 162 186
  211 194 200
Average 220 176 196
Std Dev 11.1 11.3 8.55

Although the readings for the brown contaminant were shown to affect the OSEE readings differently than the metal working fluid, the contaminant did not cause the readings to become higher than the original clean coupon.

Success Rating:

A cleanliness study, addressing only various analytical techniques.

Conclusion:

Despite determining that the second contaminant (brown gunk) affected OSEE readings differently than the metal working fluid, the values were not higher than the base line readings.  Further examination of OSEE readings need to be performed on the original parts using the same procedure as in the first experiment conducted for the client.