Blotter paper is used to verify compressed air cleanliness prior to abrasive blast cleaning. This is an essential process as the contaminated compressed air can adversely impact coating performance. According to ASTM D 4285 the test for verifying the cleanliness of compressed air or other operations can be performed by attaching a piece blotter paper to a rigid backing using tape. You are able to mark the date and time of test on the blotter paper and can retain it for documentation for future use. According to ASTM D 4285, oil indication causes discoloration of white absorbent paper and it indicates the rejection of air compressor. For sandblasting work water indication of absorbent paper is not at all acceptable. In such a situation the air compressor should be rejected and subjected to repair.
Astm D 4285 Blotter Test
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