RayTek MI3 User Manual

Appendix
MI3 Rev. G Nov/2015 131
NON-METALS
Material
Emissivity
3.9 µm
5 µm
8 – 14 µm
Asbestos
0.9
0.95
Asphalt
0.95
0.95
Basalt
0.7
0.7
Carbon
Unoxidized
0.8-0.9
0.8-0.9
Graphite
0.7-0.9
0.7-0.8
Carborundum
0.9
0.9
Ceramic
0.8-0.95
0.95
Clay
0.85-0.95
0.95
Concrete
0.9
0.95
Cloth
0.95
0.95
Glass
Plate
0.98
0.85
“Gob”
0.9
—
Gravel
0.95
0.95
Gypsum
0.4-0.97
0.8-0.95
Ice
—
0.98
Limestone
0.4-0.98
0.98
Paint (non-al.)
—
0.9-0.95
Paper (any color)
0.95
0.95
Plastic, greater than
500 µm (0.02 in) thickness
0.95
0.95
Rubber
0.9
0.95
Sand
0.9
0.9
Snow
—
0.9
Soil
—
0.9-0.98
Water
—
0.93
Wood, Natural
0.9-0.95
0.9-0.95
Tab. 20: Typical Emissivity Values for Non-Metals

RayTek MI3 Specifications

General

Spectral Response	8 to 14 µm
Response Time	500 ms
Display Resolution	0.1 °C
Accuracy	±1% or 1°C (2°F), whichever is greater
Emissivity	Adjustable 0.10 to 1.00