Why buyers ask for iodine value
Iodine value is one of the most common activated carbon indicators. It is often used to compare micropore adsorption capacity, especially for small molecule adsorption and general grade comparison.
What methylene blue means
Methylene blue value is often more relevant for larger molecule adsorption and decolorization. It is commonly considered when choosing powdered or wood activated carbon for food, beverage, sugar, oil, and chemical liquid treatment.
Do not select by one number only
A high iodine value does not automatically mean the carbon is correct for every application. Particle size, hardness, ash, moisture, pH, raw material, contact time, and process condition also affect performance.
Best practice
Use iodine value and methylene blue as screening indicators, then confirm with sample testing or application-specific testing before bulk purchase.