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Blue Bullet EMISSIVITY TABLE

Emissivity is a measure of a material’s radiating efficiency.  An emissivity of 1.00 implies that the material is 100% efficient at radiating energy.  An emissivity of 0.20 implies that the material radiates only 20% of that which it is capable of radiating.

 

Tables of emissivity values are only approximated values for real materials.  A range of emissivity values is usually given for many materials whose emissivity can be affected by surface roughness or finish.  Additionally, thin sheets of material such as plastics may be semi-transparent in the infrared and therefore have reduced emissivity.

 

To optimize the surface temperature measurement of a material:

  • Avoid reflections by shielding the material from surrounding high temperature objects.

  • For semi-transparent materials such as plastic film, assure that the background is uniform and lower in temperature than the material.

  • Conduct the measurement perpendicular to the material’s surface whenever the emissivity is less than approximately 0.90.  In all cases, do not exceed angles greater than 30 degrees from perpendicular.

Note: Applicable for material temperatures from 0 to 250°C

 

Alumel

Unoxidized

0.10 – 0.25

Oxidized

0.60

 

Aluminum

Polished

0.10 – 0.05

 

Oxidized

0.10 – 0.40

 

Rough

0.10 – 0.30

 

Anodized

0.60 – 0.95

 

Aluminum Oxide

0.40

 

Asbestos

0.95

 

Asphalt

0.90 – 1.00

 

Basalt

0.70

 

Bismuth

0.50

 

Brass

Polished

0.05

 

Oxidized

0.50 - 0.60

 

Burnished

0.30

 

Carbon

Unoxidized

0.40 – 0.90

 

Filament

0.50

 

Soot

0.50 - 0.95

 

Coke

0.95 – 1.00

 

Graphite

0.70 – 0.80

 

Carborundum

0.80 – 0.90

 

Ceramic

0.90 – 0.95

 

Clay

Fired

0.95

 

Concrete

0.95

 

Chromel

Oxidized

0.60 – 0.85

 

Chromium

0.10

 

Cobalt

0.20

 

Columbium

Polished

0.20

Oxidized

0.70

 

Copper

Polished

0.10

 

Oxidized

0.20 - 0.80

Electrical terminal blocks

0.60

 

Enamel

0.90

 

Foods

0.85 – 1.00

 

Formica

0.95

 

Mullite

0.80 – 0.85

 

Glass

Convex D

0.80

 

Nonex

0.80

 

Plate

0.90 – 0.95

 

Fused quartz

0.75

 

Pyrex, lead and soda

0.95

 

Gold

0.05

 

Granite

Polished

0.85

 

Rough

0.90

 

Natural

0.95

 

Gravel

0.90 – 0.95

 

Gypsum

0.85 – 0.95

 

Haynes Alloy

0.30 – 0.80

 

Human Skin

0.99

 

Inconel

Polished

0.15

 

Oxidized

0.70 – 0.95

 

Sandblasted

0.30 – 0.66

 

Iron

Polished

0.20

 

Oxidized

0.50 - 0.95

 

Rusted

0.50 – 0.70

 

Wrought, dull

0.90

 

Iron Oxide

0.85

 

Lacquer

Colored on Al

0.75 – 0.90

 

Colored

0.95

 

Clear on Al

0.10

 

Clear on Cu

0.65

 

Lead

Polished

0.05 – 0.10

 

Oxidized

0.30 – 0.65

Rough

0.40

 

Limestone

0.95 – 1.00

 

Magnesium Oxide

0.55

 

Molybdenum

Polished

0.05

Oxidized

0.20 - 0.80

 

Monel

Oxidized

0.45 – 0.85

 

Nichrome

Clean

0.65

Oxidized

0.60 – 0.85

 

Nickel

Polished

0.10

Oxidized

0.20 – 0.95

 

Nickel Oxide

0.60

 

Oil

Animal/vegetable

0.95 – 1.00

 

Mineral

0.90 – 1.00

 

0.001” thick

0.25

 

0.002” thick

0.46

 

0.005” thick

0.70

 

Paint

Aluminum paint

0.50

 

Bronze paint

0.80

 

Paint on metal

0.60 – 0.90

 

Paint on plastic or wood

0.80 – 0.95

 

Gold enamel

0.40

Clear silicone

0.65 – 0.80

 

Paper

0.85 – 1.00

 

Plaster

0.90

 

Plastic

0.95 – 1.00

 

Platinum

0.05

 

Polyester

0.75 – 0.85

 

Polyethylene

0.10

 

Quartz

0.90

 

Roofing Paper

0.90

 

Rubber

Hard glossy

0.95

Soft rough

0.85

 

Sand

0.80 – 0.90

 

Sandstone

0.70

 

Shale

0.70

 

Silica

Powder

0.35 – 0.60

 

Glazed

0.85

Unglazed

0.75

 

Silicone Carbide

0.80 – 0.95

 

Silver

0.05

 

Soil

Dry

0.90 – 0.95

Wet

0.95 – 1.00

 

Slate

0.70 – 0.80

 

Stainless Steel

Polished

0.10 – 0.15

Oxidized

0.45 - 0.95

 

Steel

Unoxidized

0.10

 

Oxidized

0.70 - 0.95

 

Cold Rolled

0.70 – 0.90

 

Ground sheet

0.40 – 0.60

 

Rough surface

0.95

 

Tantalum

Unoxidized

0.20

Oxidized

0.60

 

Textiles

Carpet

0.85 – 1.00

 

Close weave

0.70 – 0.95

 

Cotton

0.80

 

Leather

0.95 – 1.00

 

Silk

0.80

 

Died black

0.98

 

Tin

Unoxidized

0.05 – 0.10

 

Tungsten

Unoxidized

0.05

Filament

0.30

 

Water

Liquid

0.90 – 0.95

 

Ice

0.95 – 1.00

Snow

0.80 – 1.00

 

Wood

Planed

0.80 – 0.95

Sawdust

0.75

 

Zinc

Polished

0.05

 

Oxidized

0.10

Galvanized

0.20 – 0.30

Source Credit: OptoTherm, http://www.optotherm.com/emiss-table.htm

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