Material:	Density (g/ml)

Copper 	8.9
Brass:	8.0
Pyrex (Glass)	2.23
Rubber (Hard/Commercial)	1.2 / 1.1 
Acrylic	1.16-1.19
Aluminum	2.7
Nylon/Derlin Plastic	1.13/1.420
PVC	1.39-1.42
Teflon (PTFE)	2.2
Tecaform	1.403
Oak	0.6-0.9
Poplar	0.3-0.5