Hydroxyl Value of Polyol by Titration: DIN 53240-2:2007 or ASTM-D2474
Employing the Titration Applications for Quality Control in Polyol Products
DIN 53240-2
The titrimetric method based on DIN 53240-2, November, utilizes a catalyst to determine the hydroxyl value of resins, raw materials for paints and varnishes, primary alcohols, glycols, and fats.
This application note describes the process of determining the hydroxyl value of polyols using acetylation and back-titration methods catalyzed by 4-dimethylaminopyridine.
ASTM D4274
The method based on ASTM D4274 involves measuring the hydroxyl groups in polyester and polyether polyols containing primary and secondary hydroxyl groups. It is also applicable to hydroxyl-containing substances.
This application note details the process of determining the hydroxyl value of polyols standard in polyurethane foams using ethanol: toluene mixture.
By downloading this application package, you will receive a PDF of the application note as well as the required data for the LabX™ titration software method.
What Is Hyroxyl Value?
Hydroxyl value measures the amount of hydroxyl groups in a substance. It helps determine reactivity and functionality for consistent product quality. The hydroxyl value is expressed in milligrams of potassium hydroxide (KOH) required to neutralize the hydroxyl groups in one gram of the tested substance.
What Is the Significance of the ASTM D4274 Standard in This Study?
The ASTM D4274 standard provides a trusted and standardized method for determining the hydroxyl value of polyols in polyurethane-based products, making it an essential component of this study.
What Is the Significance of the DIN 53240-2 Standard in This Study?
DIN 53240-2 is a German Industrial Standard (Deutsche Industrie Norm) that specifies a method for determining the hydroxyl value of polyols. It provides guidelines and recommendations for the acetylation of hydroxyl groups in polyols, hydrolysis of unreacted acetic anhydride with water, and back titration with potassium hydroxide solution.
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