Calibration of measurement equipment to PN10 measures more particles than calibration to PN23. It is therefore logical that compliance with a limit when measured according to PN10 demonstrates compliance with the same limit according to PN23 but this text should be added for legal certainty.
BYK is ALTANA Group’s global Additives & Instruments business unit. It encompasses the additives of BYK-Chemie and the instruments business of BYK-Gardner.
You can find more information about BYK at their website.