materialmatrix

		Material Types
	common units	Wood	Metal	Polymer	Ceramic
Physical Properties
Density	kg/m**3	low	high	low	medium
Electrical Resistivity	½ m	high	very low	high	very high
Thermal Conductivity	W / m K	low	very high	low	very low
Thermal Expansivity	1 / K	low	high	low to very high	very low
Hardness	relative units	medium	medium to very high	low to medium	very high
Mechanical Properties
Tensile Strength	Pa	medium	high	low to medium	low
Stiffness	Pa / kg m**3	medium	high	low to medium	very high
Toughness	J/ / m**2	high	very high	medium	very low
Resistance to deterioratin in damp environments	relative units	medium	medium to high	very high	very high