Download PDFBlotter Paper is a highly absorbent test medium used to visually detect the presence of oil, water, and other contaminants in compressed air systems. It plays a crucial role in ensuring air cleanliness, especially in sensitive applications such as abrasive blasting, where even minor contamination can compromise surface preparation quality.
Following procedures outlined in standards like ASTM D4285, operators secure the blotter paper to a rigid backing and expose it to compressed air for a specified duration. After exposure, the paper is inspected for visible signs of contamination—such as oil spots, water stains, or particulate matter. Any such markings indicate impurities in the air supply.
This method provides an immediate, low-cost, and instrument-free means of monitoring compressed air quality, making it an efficient choice for field and shop environments where quick decision-making is essential.
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