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DHT-4A & DHT-4V - Kisuma Chemicals


DHT-4A and DHT-4V DHT-4A halogen scavenger for polymersDHT-4A® is the flagship product of Kisuma Chemicals' branded range of hydrotalcite-like materials that have been developed specifically for irreversible acid scavenging in polymer production and processing systems. Already for more than 30 years, DHT-4A® is considered to be the industry standard for deactivation of catalyst residues in polyolefins. The product is environmentally harmless and is generally acknowledged to be the best of its kind. This is reflected by the fact that DHT-4A® is on the approval list of practically all polyolefin technology providers globally. Designed for Performance The superiority of DHT-4A® as compared to other products results from its particular mechanism of adsorbing acids based on anion exchange. In the presence of acidic substances such as chloride ions, DHT-4A® will exchange the carbonate ions from the interlayer of its crystal structure and replace them with the chloride ions, which are rendered harmless. Advantages of DHT-4A® Compared to alternative additives, such as Calcium Stearate (Ca-St), DHT-4A® superior for the following reasons: DHT-4A® can adsorb anions equivalent to about 10% of its own weight. The significantly higher capacity compared to alternatives minimizes the loss of physical properties of polymers. With DHT-4A®, superior haze, gloss and transparancy properties can be achieved. By using DHT-4A®, stearic acid vapors can be eliminated.

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