Polypropylene (PP) is one of the most extensively produced polymers, especially widely used as automotive parts due to its good impact resistance as well as processability.
The addition of fillers into PP matrix has been an accepted route to achieve enhancement in material properties or/and cost saving possibilities.
Talc is the softest mineral filler used in the plastics industry.
It has high resistivity, low gas permeability, low abrasiveness, and high lubricity. All of these qualities are attributed to talc's platey structure. The aspect ratio of talc fillers is as high as 20:1.
Talc with a high aspect ratio has shown reinforcement ability in high-density polyethylene, polypropylene, and other thermoplastics, especially when they are treated with coupling agents to promote better bonding with these polymers.
The platy shape of talc particles can increase the stiffness of products such as polypropylene, vinyl, polyethylene, nylon, and polyester. It can also increase the heat resistance of these products and reduce shrinkage. Where the plastic is extruded in the manufacturing process, talc's very low hardness produces less abrasion on equipment than harder mineral fillers.