Example properties for a 2 nanosilicate-filled polyamide

For a very similar density, the nanocomposite has significantly better thermomechanical properties than the neat polyamide. 

Impact modifiers enhance impact strength at ambient temperature and reduce embrittlement at sub-zero temperatures. The principle is to distribute and dampen the energy of an impact by adding an elastomer or a rubbery polymer, which also reduces rigidity and some other properties. 

Impact enhancers modify the balance of properties, notably stiffness, hardness, HDT (see Table 3.9), as well as, possibly, weatherability and thermal stability. 

Some inorganic impact modifiers are also marketed, such as amorphous silicon dioxide. 

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Table 3.8 Example properties for a 2% nanosilicate-filled polyamide...

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