Emissivity Table for Non-Metals
In the table below, please use the 8-14 micron column if you have an MT, ST, or MX. Please check your user manual if you own a 3i to determine the correct column to use.
Note: These emissivities values are "approximate" and may vary depending on the actual material and conditions.
Note: These emissivities values are "approximate" and may vary depending on the actual material and conditions.
Material | Emmisivity |
||||
10. pm |
5.0 pm |
7.9 pm |
8-14 pm |
||
Asbestos | 0.9 |
0.9 |
0.95 |
0.95 |
|
Assphalt | n.r |
0.9 |
0.95 |
0.95 |
|
Basalt | n.r |
0.7 |
0.7 |
0.7 |
|
Carbon | |||||
Unoxidized | 0.8-0.95 |
.08-0.9 |
0.8-0.9 |
0.8-0.9 |
|
Graphite | 0.8-0.9 |
0.7-0.9 |
0.7-0.8 |
0.7-0.8 |
|
Carborundrum | n.r |
0.9 |
0.9 |
0.9 |
|
Ceramic | 0.4 |
0.85-0.95 |
0.95 |
0.95 |
|
Clay | n.r |
0.85-0.95 |
0.95 |
0.95 |
|
Concrete | 0.65 |
0.9 |
0.95 |
0.95 |
|
Cloth | n.r |
0.95 |
0.95 |
0.95 |
|
Glass | |||||
Plate | n.r |
0.98 |
0.85 |
0.85 |
|
Gob | n.r |
0.95 |
0.95 |
0.95 |
|
Gravel | n.r |
0.95 |
0.95 |
0.95 |
|
Gypsum | n.r |
0.4-0.97 |
0.8-0.95 |
0.8-0.95 |
|
Ice | n.r |
0.4-0.98 |
0.98 |
0.98 |
|
Paint (non-Al.) | 0.9-0.98 |
0.9-0.95 |
|||
Paper (any color) | n.r |
0.95 |
0.95 |
0.95 |
|
Plastic | |||||
Qpaque | n.r |
0.95 |
0.95 |
0.95 |
|
Over 20 mils | n.r |
||||
Rubber | n.r |
0.9 |
0.95 |
0.95 |
|
Sand | n.r |
0.9 |
0.9 |
0.9 |
|
Snow | n.r |
0.9 |
0.9 |
||
Soil | n.r |
<> |
0.9-0.98 |
0.9-0.98 |
|
Water | n.r |
0.93 |
0.93 |
||
Wood (natural) | n.r |
0.9-0.95 |
0.9-0.95 |
0.9-0.95 |
n.r. = not recommended
To optimize surface temperature measurement accuracy:
- Determine the object emissivity for the spectral range of the instrument to be used for the measurement.
- Avoid reflections by shielding object from surrounding high temperature sources.
- For higher temperature objects use shorter wavelength instruments, whenever possible.
- For semi-transparent materials such as plastic film and glass, assure that the background is uniform and lower in temperature than the object.
- Hold instrument perpendicular to surface whenever emissivity is less than 0.9. In all cases, do not exceed angles more than 30 degrees from incidence.
- For 1M and 2M models, avoid measurements in high ambient light conditions.
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