Emissivity Tables for Infrared Thermometers
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www.clarksol.com CLARK SOLUTIONS Infrared Thermometers Technical bulletin: Emmissivity Understanding an object's emissivity, or its characteristic "radiance" is a critical component in the proper handling of infrared measurements. Concisely, emissivity is the ratio of radiation emitted by a surface or blackbody and its theoretical radiation predicted from Planck's law. [W(L,T)=C1/(LA5*(exp(C2/LT)-1)] A material's surface emissivity is measured by the amount of energy emitted when the surface is directly observed. There are many variables that affect a specific object's emissivity, such as the wavelength of inter-est, field of view, the geometric shape of the blackbody, and temperature. However, for the purposes and applications of the infrared thermometer user, a comprehensive table showing the emissivity at correspon-ding temperatures of various surfaces and objects is displayed. Materia (Non- Metals) 199 ( 93) 100-700 (38-371) Asphalt, pavement Asphalt, tar paper 70 (21) 2500-5000 (1371-2760) Fire Clay 2500 (1371) Light Buff 1000 (538) Lime Clay Fire Brick 1 832 (1000) Magnesite, Refractory 1 832 (1000) Grey Brick 2012 (1 ) 093 ) 093 ) Sandlime 371 -2760) 800-2000 (427-1093) Alumina on Inconel Earthenware, Glazed Earthenware, Matte 70 (21) Greens No. 5210-2C 200-750 (93-399) 158(70) Shale 68 (20) Tiles, Light Red 2500-5000 (1371-2760) Ties, Red 2500-5000 (1371-2760) 2500-5000 (1371-2760) 0.78 lutions 10 Brent Drive Օ Hudson, MA 01749 Tel. 978 / 568 3400 Օ Fax 978 / 568 0060

White, AI2O3 White, Y203 White, R>CO3 Yellow, PbO , Aluminium 26% Al Paints, Bronze Low .34-.80 ii Gum Varnish (2 coats) 70 (21) 0.53 Gum Varnish (3 coats) 70 (21) 0.5 Cellulose Binder (2 coats) 70 (21) 0.34 Black Gloss Camouflage Lamp Black 209 (98) Red 200 (93) _ White Quar tz, Rough, Fused Glass, 1.98 mm _ Glass, 1.98 mm _ Glass, 6.88 mm Glass, 6.88 mm 1540 (838) Opaque 570 (299) _ Opaque 1540 (838) 74 (23) Sand Sands Saw dust Shale Silica,Glazed Silica, Unglazed Silicon Carb Silk Cloth Slate Snow, Fine Parti , Granular 100 ( 100 ( 1832 (1000) 300-1200 (149-649) 68 (20) 8 (-8)

Surface Black Loam Plowed Field Stonew ork Waterglass srialf metal) T (degC) E emp degF -CR, 55-FE, Ox i-Ni, 12-CR, 28-FE, Ox -Ni, 12-CR, 28-FE, Ox !0-Ni, 20-CR, Oxidised 212 (100) 30-Ni, 20-CR, Oxidisec 80-Ni, 20-CR, Oxidised 1112 (600)

176 (80) 73% Cu, 27% Zn, Polished 674 (357) 494 (257) 62% Cu, 37% Zn, Polished 62% Cu, 37% Zn, Polish 83% Cu, 17% Zn, Polish Matte Burnished to Brow n Col Cu-Zn, Brass Oxidised Cu-Zn, Brass Oxidised Cu-Zn, Brass Oxidi Unoxidised 77 (25) Unoxidised 212 ( 100) 572 (300) 32 (500) ium, Polishe Cobalt, Unoxidised Cobalt, Unoxidis Columbium, Un Columbium, Unoxidise e (.0001) Plate on .0005 Silv Plate on .0005 Nickel -750 (93-399) -750 (93-399) -500 (38-260)

1964.qxp table.main {} tr.row {} td.cell {} div.block {} div.paragraph {} .font0 { font:4.00pt "Arial", sans-serif; } .font1 { font:8.00pt "Arial", sans-serif; } .font2 { font:10.00pt "Arial", sans-serif; } Haynes Alloy X, ■ ■ Oxidised 600-2000 (316-1093) Inconel Sheet 1000(538) Inconel Sheet 1200 (649) Inconel Sheet Inconel X, Polished Inconel B, Polished Iron Oxidised 2190 (1199) Unoxidised 212 (100) Red Rust Rusted Liquid Cast Iron Oxidised Unoxidised 212 (100) Strong Oxidation 40 (104) _ Strong Oxidation 482 (250) Liquid 100-500 (38-260) 1880-3140 (1027-1727) Mercury 32 (0) Mercury...

Tantalum, Unoxidised 1340 (727) Tantalum, Unoxidised 2000 (1093) Tantalum, Unoxidised Tantalum, Unoxidised 5306 (2930) Tin, Unoxidised 77 (25) Tin, Unoxidised Tinned Iron, Bright Tinned Iron, Bright Titanium ■■ Alloy C110M,Rolish ed 300-1200 (149-649) ■■ Oxidised at 538de gC(1000degF) 200-800 (93-427) ■■ Alloy Ti-95A,Oxidis ed at 538degC( 200-800 (93-427) ^| Anodized onto SS 200-600 (93-316) Unoxidised 77 (25) Unoxidised 212 (100) Unoxidised Unoxidised 1832 (1000) Unoxidised 2732 (1500) Filament (Aged) 100 (38) Filament (Aged) 1000 (538) Filament (Aged) 5000 (2760) Bright, Galvanised...