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Material Emissivity
1.0µm 1.6µm 8-14µm
Oxidized 0.5-0.9 0.4-0.9 0.2-0.6
Unoxidized 0.25-0.35 0.1-0.35 0.1
Monel (Ni-Cu) 0.3 0.2-0.6 0.1-0.14
Nickel
Oxidized 0.8-0.9 0.4-0.7 0.2-0.5
Electrolytic 0.2-0.4 0.1-0.3 n.r.
Platinum
Black n.r. 0.95 0.9
Silver n.r. 0.02 n.r.
Steel
Cold-Rolled 0.8-0.9 0.8-0.9 0.7-0.9
Ground Sheet n.r. n.r. 0.4-0.6
Polished Sheet 0.35 0.25 0.1
Molten 0.35 0.25-0.4 n.r.
Oxidized 0.8-0.9 0.8-0.9 0.7-0.9
Stainless 0.35 0.2-0.9 0.1-0.8
Tin (Unoxidized) 0.25 0.1-0.3 n.r.
Titanium
Polished 0.5-0.75 0.3-0.5 n.r.
Oxidized n.r. 0.6-0.8 0.5-0.6
Tungsten n.r. 0.1-0.6 n.r.
Polished 0.35-0.4 0.1-0.3 n.r.
Zinc
Oxidized 0.6 0.15 0.1
Polished 0.5 0.05 n.r.
Table 2. Emissivity Values for Non-Metals
Material Emissivity
1.0µm 1.6µm 8-14µm
Asbestos 0.9 0.9 0.95
Asphalt n.r. 0.95 0.95
Basalt n.r. 0.7 0.7
Carbon
Unoxidized 0.8-0.95 0.8-0.9 0.8-0.9
Graphite 0.8-0.9 0.7-0.9 0.7-0.8
Carborundum n.r. 0.9 0.9
Ceramic 0.4 0.85-0.95 0.95
Clay n.r. 0.85-0.95 0.95
Concrete 0.65 0.9 0.95
Cloth n.r. 0.95 0.95
Glass
Plate n.r. 0.98 0.85
July 1, 2003 - 69 - Version 1.0
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Tel: (01943) 602001- WWW.ISSLTD.CO.UK - Fax: (01943) 816796