Talc and calcium carbonate are used for filling, the main purpose are as below:
Increase the dimensional stability ( reduce shrinkage )
Increase the stiffness of the material
Increase the heat resistance of materials
Reduce the cost of material and other aspects
It is also has drawback:
Increase the density
Easy to decrease the impact toughness
Shiny material decline
The granularity of Talc and calcium carbonate has distinction, generally 300 mesh, 600 mesh, 800 mesh, 1250 mesh and 2500 mesh, of course, there are finer fineness, we can select the 800 mesh and 1250 mesh in the general use of plastic. This allows the performance (price ratio) highest.
The price of talc powder has fluctuations, generally, according to the mesh to set prices will not be a big problem.
Talc is a sheet shape, so it has a higher stiffness, dimensional stability and heat-resistance temperature. Calcium carbonate are generally granular, calcium carbonate can generally be divided into light calcium carbonate and heavy calcium carbonate.
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