quality = grade (degree of excellence )
property (distinctive caracter)
strength
hardness qualities
ductility are properties of metals
electrical conducitivity characteristics
resistance to corrosion
High resistance qualities
dielectric strength are properties of insulators
heat dissipation capacity characteristics
resistance to chemical factors
viscosity
volatility qualities
specific heat are properties of insulating oils
Thermal conductivity characteristics
density
copper is a high - conductive material
insulating materials of a commercial quality offer less resistance to wear
magnetic materials of a suitable grade are essential in the construction of
electromagnetic devices
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