Emissivities

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

The emissivities shown in the emissivity table are approximations. Surface quality, geometry or other parameters may influence the emissivity of the object being measured.

Metals


Material

Emissivity

bei T / °C

Aluminium, sheet, bright

0,10
100

Aluminium, anodised

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

Chrome, non-oxidised

0,08100

Chrome, polished

0,10
50

Chrome, polished

0,06150

Stainless steel, brightly polished

0,36200

Iron, sheet, sanded

0,2425

Iron, sheet, tin-plated

0,0625

Iron, flash rust

0,7025

Iron, sanded, polished

0,2840-250

Iron, brightly polished, etched

0,16150

Iron, hot-rolled

0,60130

Iron, non-oxidised

0,05100

Iron, oxidised

0,74100

Iron, rusty

0,6525

Iron, hot-rolled

0,7720

Gold, lacquer

0,37100

Gold, polished

0,0250-250

Cast iron, oxidised

0,64100

Cast iron, polished

0,2140-200

Cast iron, highly oxidised

0,9550-250

Copper, sheet, bright

0,57200-600

Copper, etched

0,0940

Copper, rolled

0,6440

Copper, commercial-grade, brightly polished
0,0720

Copper, oxidised

0,73100-200

Copper, polished

0,0340

Copper, rough

0,7440

Copper, black oxidised

0,8850

Magnesium, alloy

0,25200

Magnesium, polished

0,0720

Brass, matt

0,0720

Brass, oxidised

0,61200

Brass, polished

0,0520

Brass, polished

0,03250

Nickel, on iron

0,11-0,4020

Nickel, on cast iron

0,0550

Nickel, oxidised

0,37200

Nickel, pure, polished

0,05100

Nickel, pure, polished

0,09400
Platin, rein, poliert
0,05200

Mercury, pure

0,090

Mercury, pure

0,1025

Mercury, pure

0,12100

Silver, polished

0,0140

Steel, freshly rolled

0,24
20

Steel, oxidised

0,80100-700

Steel, polished

0,07100

Steel, rough surface

0,9650

Steel, highly oxidised

0,8850

Titanium, oxidised

0,40200

Bismuth, polished

0,3780

Zinc, sheet

0,2050

Zinc, galvanised

0,2830

Tin, sheet coating

0,07100

Tin, polished

0,04200-300

Tin, polished

0,0550-100

Tin oxide

0,3220


Non-metals


Material Emissivity at T / °C
Graphite, filings 0,98 20
Rubber, hard 0,93 25
Rubber, soft 0,86 25
Ceramic, porcelain, glazed 0,75-0,92 20
Ceramic, porcelain, unglazed 0,9 20
Ceramic, earthenware, glazed 0,9 20
Ceramic, earthenware, matt  0,93 20
Linoleum, russet 0,92 20
Emery 0,86 80
Building materials


Material

Emissivity

at T / °C

Asbestos fabric

0,90
93

Asbestos paper

0,94
40 - 350

Asbestos sheet

0,96
40

Asphalt

0,97
4

Asphalt

0,93
20
Basalt
0,72
20

Roofing felt

0,93
20

Plaster, boards

0,90
20

Gypsum, plaster, rough

0,91
20

Gypsum, bulk

0,80
20

Granite

0,45
20

Granite, polished

0,85
20

Granite, rough

0,88
20

Gravel

0,2840

Marble, grey, polished

0,7540

Marble, white, smooth

0,5640

Marble, white, rough

0,9540

Brickwork

0,93 - 0,94
40

Plaster, brickwork, rendered

0,94
20

Sandstone, polished

0,91
20

Sandstone, rough

0,9320

Bricks, porous, refractory

0,8520

Stucco, lime, rough

0,9120

Clay bricks, air-dried

0,90
20

Clay bricks, red, rough

0,93
20

Clay bricks, fireclay

0,85
20


Paints


Material

Emissivity

at T / °C

Aluminium paint, lacquered rough surface

0,40
20

Enamel

0,85 - 0,95
20

Paint, radiator paint

0,91 - 0,93
70

Paint, radiator paint, aluminium-based

0,78
70

Paint, clear lacquer, on copper

0,65
90


Natural materials


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, rough 0,85 25
Wood, moist, light 0,70-0,80 20
Wood, planed 0,9 20
Wood, pine 0,81-0,89 20
Carbon brushes 0,75-0,80 100-600
Carbon, fibres 0,95 260
Carbon, lamp black 0,95 20
Carbon, cleaned 0,8 100-600
Carbon, graphite 0,76 100
Carbon, non-oxidised 0,81 25-100
Carbon, non-oxidised 0,79 500
Cork 0,8 20
Leather, butt 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