ISO Standard 12103-1 - Powder Technology Inc.
ISO 12103-1,A3 Medium Test Dust is nominal 0-80 micron size with a lower 0-5 micron content than ISO 12103-1,A2 Fine Test Dust. Medium Test Dust is identical to former SAE 5-80 Micrometer Test Dust specified in SAE J1858: Full flow lubricating oil filters multipass method for evaluating filtration performance (now relaced by ISO 4548-12). ...