What Is an Iodine Value?

Iodine value (iodine number) is an indicator of the degree of unsaturation in organic compounds. Refers to the grams of iodine that can be absorbed (added) in 100g of material. Mainly used for the determination of oils, fatty acids, waxes and polyesters. The greater the degree of unsaturation, the higher the iodine value. The iodine value of the dry oil is greater than the iodine value of the non-drying oil.

Iodine number

Express

Mainly used for oils, fatty acids,

First prepare Wijs reagent,

Iodine value> 130 is a dry oil: dry oil is highly unsaturated and easily oxidized to form macromolecular substances, forming a hard film on the surface. Linseed oil and tung oil are dry oils, which are not suitable for soap making.

Iodine value 130 100 is semi-dry oil: semi-dry oil can be used in soap making, such as cottonseed oil, bran oil, rapeseed oil, etc., but the amount should not be too much. Generally, the amount of cottonseed oil cannot exceed 3% 5%.

Iodine value <100 is non-drying oil: coconut oil, palm oil, peanut oil in vegetable fats, tallow, sheep oil, and lard in animal fats are all non-drying oils, suitable for soap making.