Micronized sodium chloride, also known as microfine sodium chloride or micronized salt, is a finely powdered form of sodium chloride (NaCl). In polymer applications, micronized sodium chloride can serve several purposes:


Micronized sodium chloride can be used as a filler in polymer composites to enhance mechanical properties such as tensile strength, modulus, and impact resistance. The fine particle size and high surface area of micronized salt facilitate its dispersion within the polymer matrix, leading to improved reinforcement.

Density Modification

Incorporating micronized sodium chloride allows for the adjustment of the density of polymer formulations. This can be advantageous in applications where specific density requirements need to be met or where weight reduction is desired without compromising other properties.

Viscosity Control

Sodium chloride can influence the viscosity of polymer solutions or melts when added in appropriate amounts. This property can be utilized to control the flow behavior of polymer melts during processing, improving processability and enhancing the final product’s characteristics.

Thermal Conductivity Enhancement

In certain polymer systems, the addition of micronized sodium chloride can increase thermal conductivity. This is particularly relevant in applications where heat dissipation or thermal management is crucial, such as in electronic encapsulation materials or heat-resistant coatings.

Flame Retardancy

Sodium chloride itself is not a flame retardant, but in some cases, it can contribute to flame retardancy when incorporated into polymer formulations. The presence of salt particles can act as a physical barrier, inhibiting the spread of flames and reducing the release of flammable gases.

Anti-blocking Agent

Micronized sodium chloride can be used as an anti-blocking agent in polymer films and coatings to prevent them from sticking together during storage or processing. Its fine particle size helps to create a uniform surface texture, reducing the tendency of films to adhere to each other.

Hygroscopicity Control

Sodium chloride is hygroscopic, meaning it has the ability to absorb moisture from the surrounding environment. In polymer formulations, micronized salt can help to control the moisture content, which is important for maintaining product stability and performance, especially in applications sensitive to moisture.