What Factors Should Be Considered When Selecting Fillers for TPE Materials?

In the formulation design process for TPE materials, the selection of fillers is critical. It not only affects costs but also directly impacts the material’s processability, appearance, and physical and mechanical properties. With such a wide variety of fillers available on the market, how exactly should one select the right TPE filler? Zhongsuwang Raw Material Processing Plant shares some insights.

First, select the type of filler based on performance requirements. For general-purpose products seeking high cost-effectiveness—such as floor mats and handles—heavy calcium carbonate is an ideal choice. It is inexpensive and widely available, primarily serving to increase material volume and reduce costs. Although its contribution to strength enhancement is limited, it meets basic filling requirements.

If the product requires high strength and high elongation—typically found in mid-to-high-end applications—lightweight calcium carbonate or active calcium carbonate is more suitable. These fillers have smaller particle sizes and larger specific surface areas, which can enhance the tensile strength and tear resistance of TPE materials.

For products requiring improved heat resistance, dimensional stability, and rigidity—such as automotive interior components—talc is the ideal choice. It forms a layered barrier within the material, enhancing these properties. For products requiring high surface gloss, high filler loading, and good physical properties, barium sulfate performs exceptionally well.

Secondly, the particle size and distribution of the filler must not be overlooked. Generally, the smaller the particle size, the better the reinforcing effect; however, this also increases the likelihood of agglomeration, which can adversely affect processing and performance. In conventional TPE modification, a particle size range of 800 to 1250 mesh is commonly used.

Furthermore, attention must be paid to the surface treatment of the filler and its compatibility with the matrix. Fillers that have undergone surface activation treatment can significantly improve dispersion within the TPE matrix, thereby enhancing material performance.

Additionally, the impact of the filler’s oil absorption value on processing performance must be considered. In applications requiring high filler loading or superior flow properties, fillers with low oil absorption values should be prioritized.

In summary, selecting the appropriate TPE filler hinges on balancing cost, performance, and processing requirements. Choosing fillers based on specific product needs is essential for developing TPE materials that are competitive in the market.