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1.1 This practice is used to determine the presence of oil or water in compressed air used for abrasive blast cleaning, air blast cleaning, and coating application operations. It is also known as a blotter test.

1.2 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see Section 4.

1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

2.1 Clean, dry compressed air is required to prevent contamination of coating materials and surfaces being prepared for coating. This practice is a visual examination technique for determining the presence of oil or water in compressed air after it passes through separators, coolers, or driers. Other types of contamination may require additional analytical techniques for detection.

2.2 The SSPC/NACE abrasive blast cleaning surface cleanliness standards require the use clean, dry compressed air.