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In the plastics industry, precipitated barium sulfate is not simply a low-cost filler, also a functional auxiliary agent that optimizes performance and enables functions. Its core roles revolve around the three dimensions of “enhancing mechanical properties, improving appearance, and optimizing process adapt” of plastic products, which can be further subdivided into the following categories:

A. Core functions: Enhance the mechanical properties and durability of plastics
Precip barium sulfate can significantly enhance the structural stability of plastics, addressing issues such as “insufficient rigidity, easy wear, and poor heat resistance” in ordinary plastics,:

1. Enhance rigidity and hardness
When added to general-purpose plastics such as PP (polypropylene), PE (polyethylene), and ABS, it can improve the flexural modulus (ability to resist deformation) and surface hardness of products. For example, after adding to household appliance shells (such as washing machine and air panels), they are less likely to deform due to collisions or long-term use; the surface scratch resistance of mobile phone cases and children’s toys is enhanced, reducing scratches wear during use.
2. Improve heat resistance and dimensional stability
Its high-temperature resistance (decomposition temperature >1600℃) can improve the heat deflection of plastics and reduce the shrinkage rate in high-temperature environments. For example, when added to PVC pipes and profiles production, it can avoid the deformation of pipes due to exposure the sun or hot water transportation in summer; car plastic parts (such as engine surrounding plastic parts) can withstand higher working temperatures, extending the service life.
3. Improve impact and toughness (specific scenarios)
When used with “elastomer modifiers”, ultra-fine precipitated barium sulfate can disperse internal stresses in plastics avoiding the fracture of products due to excessive brittleness. For example, after adding to plastic pallets and boxes made of HDPE (high-density polyethylene) they maintain rigidity and are less likely to crack due to falling or collisions.

B. Key functions: Optimize the appearance and processability of plastics
With its higheness and easy dispersion characteristics, precipitated barium sulfate can solve problems such as “rough appearance, insufficient whiteness, and easy agglomeration during processing” of plastic:

1. Brightening and color adjustment auxiliary
With a whiteness of more than 95%, it can be used as an “auxiliary brightening agent for plastics, partially replacing the more expensive titanium dioxide (TiO₂). For example, when added to white PPR pipes and food-grade plastic containers, it can not reduce formula costs but also avoid the brittleness of plastics caused by excessive titanium dioxide, while maintaining a uniform white appearance of the products without yellowing or color difference.2. Improve surface smoothness and dispersion
Ultra-fine precipitated barium sulfate with a particle size of 1-5μm can be evenly dispersed in molten plastic, reducing the “agglomeration” of particles and making the surface of the product more delicate and smooth. For example, after adding to ABS plastic interior parts household appliances and cosmetic packaging bottles, the surface has no graininess and enhances the texture; a small amount added to transparent or translucent plastics (such as PS, PC) also reduce haze and improve light transmission.
3. Optimize processing fluidity
Its flaky or spherical crystal structure can reduce the friction resistance of molten plastic in the, improve “fluidity”, and facilitate the injection molding of complex structure parts (such as plastic gears with fine textures, precision electronic component shells), reducing processing defects such “missing material” and “bubbles”.