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Trial Number 9

Trial Purpose:

To evaluate effect wiping has on OSEE readings for stainless steel parts.

Date Run:

12/18/2002

Experiment Procedure:

Four stainless steel slugs were analyzed as received using a PET OSEE SQM 100 instrument. Four readings were recorded for each side to establish a baseline. Parts were subjected to two separate wipings. Three slugs were wiped with acetone first, followed by OSEE readings. Then the part was wiped with isopropyl alcohol and a third set of OSEE readings were taken. One part was first wiped with a dry paper towel, followed by OSEE readings. Then the part was wiped using isopropyl alcohol and a third set of OSEE readings was recorded. Two different paper towels were used: Kimberly-Clark Kaydry EX-L and Texwipe TechniCloth TX 609.

Trial Results:

From the OSEE readings, it appears that the type of wiper used has the most effect on the readings obtained. The Kimberly-Clark wipers caused the OSEE readings to be lower than the Texwipe wipers. Table 1 lists the readings recorded for each slug.
OSEE Analysis

KC Wipe Base Acetone Alcohol Observation
Part 1A 229 229 284 Alcohol wipe resulted in visible removal of grey material
5 sec wipe 220 258 226  
  306 257 253  
  238 309 225  
Average 248 263 247  
  Base Acetone Alcohol Observation
Part 1B 280 262 296 Acetone wipe resulted in visible removal of grey material
10 sec wipe 256 315 234  
  222 312 232  
  248 260 279  
Average 252 287 260  
  Base Acetone Alcohol  
Part 2A 228 279 241  
10 sec wipe 288 300 271  
  288 308 280  
  255 333 265  
Average 265 305 264  
  Base Acetone Alcohol  
Part 2B 192 275 339  
10 sec wipe 278 256 264  
  488 287 239  
  249 338 186  
Average 302 289 257  
  Base Dry wipe Alcohol  
Part 3A 274 229 237  
10 sec wipe 436 243 286  
  320 257 361  
  262 337 273  
Average 323 267 289  
Texwipe Base Dry wipe Alcohol Observation
Part 3B 233 294 308 Alcohol wipe resulted in visible removal of grey material
10 sec wipe 232 229 338  
  267 221 310  
  302 245 336  
Average 259 247 323  
  Base Acetone Alcohol Observation
Part 4A 267 289 288 Acetone wipe resulted in visible removal of grey material
10 sec wipe 239 405 358  
  235 308 401  
  313 275 351  
Average 264 319 350  
  Base Acetone Alcohol Observation
Part 4B 304 272 332 Acetone wipe resulted in visible removal of grey material
10 sec wipe 229 329 327  
  252 348 273  
  298 303 363  
Average 271 313 324  

The second table compares the readings between each wipe with the base readings. Values that are negative signify that the second reading was less than the first reading. For example, the W1 reading (acetone with Kimberly-Clark wiper) was 15 points higher than the base reading. The W2 (alcohol with Kimberly-Clark wiper) was 16 points lower than the W1 reading. The third column shows that the W2 reading (alcohol wipe) was 1 point lower than the base reading.

Table 2. Wipe Effect Comparison

          W1-B     W2-W1   W2-B

Success Rating:

A cleanliness study, addressing only various analytical techniques.

Conclusion:

Wiping with Acetone and Alcohol using the Texwipe wipers resulted in higher OSEE readings than wiping with the Kimberly-Clark wipers.  The acetone soaked wiper was more effective than wiping with a dry Texwipe.

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