The addition of talc in polypropylene (PP) serves to enhance its mechanical and thermal properties. Talc, a plate-like mineral, acts as a reinforcing filler that improves the stiffness, heat resistance, and dimensional stability of PP. The incorporation of talc leads to an increase in the tensile strength and modulus of elasticity, making the material more rigid and less prone to deformation under stress. Additionally, talc-filled PP exhibits improved thermal properties, with higher heat deflection temperatures allowing for its use in applications needing higher temperature resistance. However, it's worth noting that adding talc can also make the PP matrix more brittle, which might reduce its impact strength. The overall effect of talc on polypropylene significantly depends on the filler's concentration, particle size, and distribution within the polymer matrix. Optimizing these factors can lead to a material that is suitably tailored for specific applications, balancing improved mechanical and thermal performance with the desired level of toughness.

Polypropylene (PP) shrinkage refers to the reduction in size experienced by polypropylene products during its cooling phase post-molding. This polymer is known for its versatility, durability, and is widely used in various applications ranging from packaging to automotive components. Shrinkage is an essential factor to consider during the product design and molding process to ensure dimensional accuracy and fit of the final product. Polypropylene typically exhibits a shrinkage rate between 1% to 2.5%, though this can vary based on factors such as the addition of fillers, the part design, and processing conditions. To manage shrinkage effectively, adjustments in the tool design, careful selection of material formulations, and precise control of molding parameters are crucial. Understanding and controlling the shrinkage of polypropylene are essential for achieving high-quality, dimensionally accurate components in manufacturing.

It usually forms square crystals rutile and plagioclase or rhombohedral crystals anatase.