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Trial Number 1

Trial Purpose:

To compare cleaning on front and back of samples.

Date Run:

04/04/2000

Experiment Procedure:

Five readings were taken from both front and back of both sets of cleaned parts. Each set had four samples to be evaluated. Readings were recorded for each sheet and an average was calculated and compared to the back side readings for the same sheet. Any trends observed were to be noted.

SUBSTRATE MATERIAL: Tantulum metal sheets
CONTAMINANTS: Mobil Oil Corp, Vactra Oil Light
CONTAMINATING PROCESS USED: Received cleaned

Trial Results:

In the first set of sheets, the results were varied as shown in Table 1. Two sheets had lower front side (Sheet 1 &2) readings and two sheets (Sheets 3 & 4) had lower back side readings. The second set of sheets had more consistent readings with 3 of 4 samples having a lower front side value. With the combined data, it was decided to rerun the samples with lower back side OSEE readings. After reevaluating the samples, only one of the sheets had lower backside readings. Table 2 lists the retested values for each sheet.

Table 1. OSEE Readings

Coil Set 1                
  Sheet 1 Sheet 2 Sheet 3* Sheet 4*
  Side 1 Side 2 Side 1 Side 2 Side 1 Side 2 Side 1 Side 2
  261 378 348 373 373 382 360 305
  259 437 238 342 345 392 337 324
  284 425 346 401 356 343 334 332
  276 382 376 386 424 287 345 306
  255 372 353 420 378 410 342 309
Ave 267 398.8 332.2 384.4 375.2 362.8 343.6 315.2
                 
Coil Set 2                
  Sheet 1 Sheet 2 Sheet 3* Sheet 4*
  Side 1 Side 2 Side 1 Side 2 Side 1 Side 2 Side 1 Side 2
  239 311 180 339 223 248 274 207
  214 302 210 262 224 248 287 251
  289 303 220 265 241 317 295 301
  209 328 223 295 261 240 270 272
  184 284 206 306 268 252 319 317
Ave 227 305.6 207.8 293.4 243.4 261 289 269.6
*To Be Retested                

Table 2. Retested OSEE Readings

Coil Set 1         Coil Set 2
  Sheet 3 Sheet 4 Sheet 4
  Side 1 Side 2 Side 1 Side 2 Side 1 Side 2
  354 354 296 224 253 295
  319 419 329 197 258 265
  327 361 283 181 261 283
  329 362 265 226 241 282
  302 356 264 208 281 291
Ave 326.2 370.4 287.4 207.2 258.8 283.2

Success Rating:

A cleanliness study, addressing only various analytical techniques.

Conclusion:

OSEE readings were mostly lower for the front sides of the supplied sheets.  The backsides were marked up by the conveyor system during processing.

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