DHT-4A

DHT-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.

Applications

The interesting characteristics of DHT-4A opens doors to an wide range of applications. Compared to alternatives, such as Calcium Stearate, DHT-4A is three times more effective. This high efficiency, combined with the high purity and well defined small particle size of DHT-4A, results in a minor impact on the polymer properties. The unique mechanism by which DHT-4A renders anions inert results in a much smaller chance in side effects, such as those caused by Stearic Acid. 

Some examples of applications in which DHT-4A has successfully been implemented:

• Deactivation of catalytic residues
• Deactivation of halogen ions from radicals in halogenated flame retardants (e.g. bromide)
• Acid acceptor in halogenated rubber, where low water adsorption is important.
• Acid scavenger in glass fiber filled compounds
• IR adsorber in agricultural films, to increase heat retention and protect HALS. 
• Partial replacement of Calcium Stearate, to deactive stearic acid. 

Support Documents

Additional (technical) information about this and other products can be found on our homepage. Up-to-date support documents including Technical Datasheets (TDS), Material Safety Datasheets (MSDS) and brochures can be downloaded in multiple languages: https://kisuma.com/products/downloads