D duarteLevel 3 - 101 to 250 posts Does anyone know the difference between the gravimetric test based on the standard ASTM D893 and the procedure based on the standard ASTM D4898? Is there any standard for colorimetric patch test for soot and solids percentage? 2/9/067:30 AM Share on Facebook Share on Twitter Share on Pinterest Share on LinkedIn Share on Reddit Copy Link to Topic Report Topic Printer Friendly Format ❤️ 0 Original Post