Conductivity

Here's a longer list of  the conductivity of various materials. All of them are measured at a specific temperature, because conductivity changes when materials are hotter or colder. The W/mk is the unit for thermal conductivity which is watts per meter per Kelvin. Don't worry too much about the units.

Thermal conductivity @20° C in W/mK

Diamond          1000

Silver    406

Copper            390

Gold     314

Aluminium        237

Brass    109

Iron      79.5

Steel     50.2

Lead    34.7

Aluminium Oxide          30

Stainless Steel   16

Mercury           8.3

Quartz  3

Marble 3

Sand (saturated)           2.7

Ice       2.1

Pyrex 7740      1.005

Glass,ordinary  0.8

Concrete          0.8

Water   0.6

Brick, red         0.6

Wood  0.4

Sand (dry)        0.35

Nylon 6            0.25

Methanol          0.21

Hydrogen         0.172

Olive oil            0.17

Alcohol            0.17

PVC    0.16

Gasoline           0.15

Brick,insulating 0.15

Leather 0.14

Wood  0.12

Snow (dry)       0.104

Silicone oil        0.1

Asbestos          0.08

Cork    0.07

Foam glass       0.045

Wool felt          0.04

Fiberglass         0.04

Polystyrene (styrofoam)            0.033

Plastic insulation materials         0.03

Cotton  0.03

Air       0.025

Oxygen            0.0238

Nitrogen           0.0234

Polyurethane     0.02