What is acid value

In the determination of the lacquer-based acid value for paints and varnishes, the acid value of potassium hydroxide (KOH) milligrams (mg) required to neutralize the free acid in 1 gram of the product can be expressed. Successfully write mgKOH/g, mg KOH/g, the larger the value, the larger the acid value, and the more free acid it contains.

The acid value is an important chemical indicator used to evaluate the quality and stability of organic substances. The acid value of oils and fats is often used to evaluate their freshness and degree of oxidation, as they undergo oxidation reactions over time and temperature to produce acidic substances. The acid value of resins and coatings is often used to evaluate their quality and usability, as they undergo polymerization or decomposition reactions over time and environment to produce acidic substances.

The measurement of the acid number is usually done by reacting the sample with a certain amount of acidic solution, then using an alkaline solution for a neutralization reaction, and using an indicator to detect the end point of the reaction. The acid number is then calculated by calculating the desired amount of acidic solution to determine the amount of acid in the sample.

To sum up, acid value is an important quality indicator used to assess the quality and stability of various organic substances and is important for many industries and applications, such as food processing, pharmaceuticals, cosmetics, coatings and resins, etc.