Simple determination of hydroxyl value

Determination of hydroxyl number doesn’t have to be difficult. Fed up with long winded methods with nasty chemicals? Take a look at how Metrohm tackle the hydroxyl number using NIR and potentiometric titration. 

Quality control of polyols – Fast results with NIR pre-calibrations 

Metrohm offers a turnkey solution for the determination of the hydroxyl value in polyols according to ASTM D6342-12 and ISO 15603:2011. The measurement device consists of a DS2500 Near-infrared Analyser with a pre-calibration model based on a large collection of real product spectra. This solution enables polyol producers and polyol processors, such as polyurethane manufacturers, to save time and reduce the cost of their analyses while improving the quality of their product.

Chemical-free determination of Hydroxyl Number according to ASTM D6342-12

Toxic and corrosive chemicals such as p-toluenesulfonyl isocyanate (TSI) and tetrabutylammonium hydroxide are used for the Hydroxyl Number analysis of polyols by titration according to ASTM D4274-16. This application note demonstrates how the XDS RapidLiquid Analyser provides a cost-efficient and fast solution for the determination of the hydroxyl (OH) number of polyols. With no sample preparation or chemicals needed, Vis-NIR spectroscopy allows for the analysis of polyols in less than a minute.

Fully automated potentiometric determination of the hydroxyl number (HN) according to ASTM E1899 and DIN EN ISO 4629-2

The presented titration system can be used for the fully automated determination of the hydroxyl number (HN) according to ASTM E1899 and EN ISO 4629-2. The method allows, the determination of polyols and oxooils without boiling under reflux or other sample preparation and is therefore a big benefit for laboratories that have to cope with a high sample throughput.

The main benefits are;

• Approved ASTM and DIN methodology
• No refluxing of sample needed
• Time saving
• Can be fully automated
• Reduction in nasty, dangerous chemicals such as pyridine
• As a consequence less hazardous waste