Trotec BP21 - Page 5

EN 5
pyrometer BP21
Emissivity table
The table below may be used as reference for setting the
emissivity. It supplies reference values for the emissivity of
common materials.
Material Emissivity
Aluminium, roughened 0.1 to 0.3
Aluminium, alloy A3003,
oxidized
0.3
Aluminium, oxidized 0.2 to 0.4
Asbestos 0.92 to 0.95
Tarmac 0.92 to 0.95
Basalt 0.7
Concrete 0.92 to 0.95
Bitumen 0.98 to 1.00
Lead, oxidized 0.2 to 0.6
Lead, rough 0.4
Roofing felt 0.95
Ice 0.98
Iron (forged), blunt 0.9
Iron, oxidized 0.5 to 0.9
Iron, rusted 0.5 to 0.7
Enamel varnish, black 0.95
Earth 0.92 to 0.96
Paint (not alkaline) 0.90 to 0.95
Paint (non-metal) 0.95
gypsum 0.60 to 0.95
Glass, pane 0.85 to 0.95
Rubber 0.92 to 0.95
Cast iron, molten 0.2 to 0.3
Cast iron, not oxidized 0.2
Skin 0.98
Haynes alloy 0.3 to 0.8
Radiator enamel 0.95
Timber (natural) 0.90 to 0.95
Inconel, electro-polished 0.15
Inconel, oxidized 0.70 to 0.95
Inconel, sand-blasted 0.3 to 0.6
Limestone 0.95 to 0.98
Carborundum 0.9
Ceramics 0.88 to 0.95
Gravel 0.95
Carbon, graphite 0.70 to 0.85
Carbon, not oxidized 0.8 to 0.9
Material Emissivity
Plastic, non-transparent 0.95
Copper, oxidized 0.4 to 0.8
Varnish 0.80 to 0.95
Marble 0.90 to 0.95
Brass, highly polished 0.3
Brass, oxidized 0.5
Molybdenum, oxidized 0.2 to 0.6
Nickel, oxidized 0.2 to 0.5
Paper (any colour) 0.9
Plastic 0.85 to 0.95
Plaster 0.90 to 0.95
Sand 0.9
Snow 0.9
Steel, heavy plate 0.4 to 0.6
Steel, cold-rolled 0.7 to 0.9
Steel, oxidized 0.7 to 0.9
Steel, polished sheet metal 0.1
Steel, stainless 0.1 to 0.8
Cloth 0.95
Wallpaper (non-metal) 0.95
Textiles (non-metal) 0.95
Titanium, oxidized 0.5 to 0.6
Clay 0.90 to 0.95
Water 0.93
Cement 0.90 to 0.96
Brick (rough) 0.90 to 0.95
Zinc, oxidized 0.1