Using Guard Bands to Accommodate Uncertainty in the Spark AES Analysis of Aluminum or Aluminum Alloys When Determining Compliance with Specified Composition Limits

This paper provides a brief discussion of:

1. The uncertainty inherent in the elemental analysis of aluminum and aluminum alloys by Spark-AES.
2. The benefits of using guard bands to set internal operating limits, which are offset from specified composition limits. 
3. A model of the risk for sale of out-of-specification product based on the analysis uncertainty relative to the specified composition limits.
4. The main sources of uncertainty of Spark-AES and their potential causes.

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