emissivities

Emissivities for metals, non-metals, building materials, paints and natural materials.

The emissivities listed in the emissivity table are approximations. Surface quality, geometry, or other parameters can affect the emissivity of the detection object.

Metals

Material	Emissivity	at T / °C
Aluminium, bare sheet	0.10	100
Anodised aluminium	0.55	100
Aluminium, oxidised	0.11	200
Lead, oxidised	0.43	40
Lead, oxidised	0.63	200
Lead, rough	0.43	40
Bronze, oxidised	0.09	300
Bronze, polished	0.10	50
Bronze, porous, rough	0.55	100
Chromium, unoxidised	0.08	100
Chromium, polished	0.10	50
Chromium, polished	0.06	150
Stainless steel, polished	0.36	200
Iron, sheet metal, sanded	0.24	25
Iron, sheet metal, tinned	0.06	25
Iron, rust film	0.70	25
Forged iron, polished	0.28	40-250
Iron, shiny, etched	0.16	150
Hot-rolled iron	0.60	130
Iron, non-oxidised	0.05	100
Iron, oxidised	0.74	100
Rusty iron	0.65	25
Hot-rolled iron	0.77	20
Gold, varnish	0.37	100
Gold, polished	0.02	50-250
Cast iron, oxidised	0.64	100
Cast iron, polished	0.21	40-200
Cast iron, heavily oxidised	0.95	50-250
Copper, sheet, bare	0.57	200-600
Copper, etched	0.09	40
rolled copper	0.64	40
copper, standard commercial quality, bright	0.07	20
Copper, oxidised	0.73	100-200
Copper, polished	0.03	40
Copper, raw	0.74	40
Copper, black oxidised	0.88	50
Magnesium alloy	0.25	200
Magnesium, polished	0.07	20
Brass, matt	0.07	20
Brass, oxidised	0.61	200
Brass, polished	0.05	20
Brass, polished	0.03	250
Nickel, on iron	0.11-0.40	20
Nickel, on cast iron	0.05	50
Nickel, oxidised	0.37	200
Nickel, pure, polished	0.05	100
Nickel,pure, polished	0.09	400
Platinum, pure, polished	0.05	200
Mercury, pure	0.09	0
Mercury, pure	0.10	25
Mercury, pure	0.12	100
Silver, polished	0.01	40
Steel, freshly rolled	0.24	20
Steel, oxidised	0.80	100-700
Steel, polished	0.07	100
Steel, rough surface	0.96	50
Steel, heavily oxidised	0.88	50
Titanium, oxidised	0.40	200
Bismuth, polished	0.37	80
Zinc, sheet metal	0.20	50
Zinc, galvanised	0.28	30
Tin, sheet metal coating	0.07	100
Tin, polished	0.04	200-300
Tin, polished	0.05	50-100
Tin oxide	0.32	20

Non-metals

Material	Emissivity	at T / °C
Graphite, filings	0.98	20
Hard rubber	0.93	25
Soft rubber	0.86	25
Ceramics, porcelain, glazed	0.75-0.92	20
Ceramics, porcelain, unglazed	0.90	20
Ceramics, stoneware, glazed	0.90	20
Ceramic, stoneware, matt	0.93	20
Linoleum, red-brown	0.92	20
Emery paper	0.86	80

Building materials

Material	Emissivity	at T / °C
Asbestos fabric	0.90	93
Asbestos paper	0.94	40 - 350
Asbestos board	0.96	40
Asphalt	0.97	4
Asphalt	0.93	20
Basalt	0.72	20
Roofing felt	0.93	20
Plasterboard, panels	0.90	20
Plaster, roughcast	0.91	20
Plaster, bulk material	0.80	20
Granite	0.45	20
Granite, polished	0.85	20
Granite, rough	0.88	20
Gravel	0.28	40
Marble, grey, polished	0.75	40
Marble, white, smooth	0.56	40
Marble, white, rough	0.95	40
Masonry	0.93 - 0.94	40
Plaster, masonry, rendered	0.94	20
Sandstone, polished	0.91	20
Sandstone, rough	0.93	20
Porous stone, fireproof	0.85	20
Roughcast, lime, rough	0.91	20
Brick, air-dried	0.90	20
Brick, red, rough-faced	0.93	20
Brick, fireclay	0.85	20

Colours

Material	Emissivity	at T / °C
Aluminium colour, painted rough surface	0.40	20
Enamel paint	0.85 - 0.95	20
Paint, radiator colour	0.91 - 0.93	70
Colour, radiator colour, Al-based	0.78	70
Paint, clear coat, on copper	0.65

Natural products

Material	Emissivity	at T / °C
Cotton, fabric	0.98	20
Ice, crystals	0.98	-10
Varnish, matt	0.93	20
Wood	0.80-0.90	20
Wood, fibreboard, untreated	0.85	25
Wood, damp, light-coloured	0.70-0.80	20
Wood, planed	0.90	20
Pinewood	0.81-0.89	20
Carbon brushes	0.75-0.80	100-600
Carbon, fibres	0.95	260
Carbon, lampblack	0.95	20
Carbon, purified	0.80	100-600
Carbon, graphite	0.76	100
Carbon, not oxidised	0.81	25-100
Carbon, not oxidised	0.79	500
Cork	0.80	20
Leather, core leather, rough	0.86	20
Clay	0.39	20
Clay, dark	0.66	20
Clay, burnt	0.91	70
Clay, slate	0.69	20
Sand	0.60-0.90	20
Silk	0.78	20