ES1C

5

Emissivities

Note: Operation will be easily affected by the ambient temperature if the emissivity of the measurement object is lower than 0.9. Glossy metal surfaces generally have

an extremely low emissivity, and it is difficult to measure the temperature of the measurement object. Use Black spray or Black tape.

Item

Emissivity

Item

Emissivity

Metals

Aluminum

Iron oxide

0.78 to 0.82

Pure aluminum, high-gloss alumi-

num

0.04 to 0.06

Red rusted iron

0.69

Aluminum oxide

0.76

Gray oxidized lead

0.28

Commercially available aluminum

sheets

0.09

Mercury

0.09 to 0.12

Brass

Molybdenum filament

0.10 to 0.20

High-gloss sheets of pure brass

0.10

Nickel

Brass oxide

0.56 to 0.64

Glossy

0.07

Glossy chrome

0.08 to 0.36

Nickel oxide

0.90

Chrome oxide

0.81

Platinum

Copper

Glossy platinum sheets

0.05 to 0.10

Glossy

0.05

Platinum wire rods

0.07 to 0.18

Copper oxide

0.78

Glossy pure silver

0.03 to 0.28

Bronze with uneven surface

0.55

Stainless steel

Glossy pure gold

0.02 to 0.03

Glossy

0.07

Iron and steel (except stainless)

Rolled stainless steel

0.45

Glossy iron

0.14 to 0.38

Glossy tin

0.06

Glossy cast iron

0.21

Etched tungsten filament

0.03 to 0.35

Glossy wrought iron

0.28

Zinc

Oxidized dull-colored wrought iron

0.94

Commercially available glossy pure zinc

0.05

Rusty iron sheet

0.69

Galvanized sheets

0.21

Glossy steel

0.07

Zinc oxide

0.11 to 0.28

Thin rolled steel sheets

0.66

Titanium oxide

0.40 to 0.60

Unpolished steel sheets

0.94 to 0.97

Item

Emissivity

Item

Emissivity

Non-

metals

Asbestos

0.93 to 0.94

Water

0.92 to 0.96

Bricks

Ice

0.96 to 0.98

Red, unpolished

0.93

Snow

0.83

Fireclay

0.75

Glass

0.85 to 0.95

Carbon

Ceramics

0.90 to 0.94

Filament

0.53

Marble

0.94

Soot film

0.84 to 0.95

Fluorite

0.30 to 0.40

Paint, lacquer, varnish

Gypsum

0.80 to 0.90

Coated lacquer

0.80 to 0.95

Plaster

0.89 to 0.91

White enamel

0.91

Brick (red)

0.93 to 0.95

Black lacquer

0.96 to 0.98

Fibers

0.90

Aluminum paint

0.27 to 0.67

Cloth (black)

0.98

16-color oil-based paint

0.92 to 0.96

Skin (human)

0.98

Glazed porcelain

0.92

Leather

0.75 to 0.80

Opaque crystals (quartz)

0.68 to 0.92

Charcoal (powder)

0.96

Asphalt

0.90 to 0.98

Rubber (black)

0.94

Concrete

0.94

Plastic

0.85 to 0.95

Cement

0.96

Lumber

0.90

Sand

0.90

Paper

0.70 to 0.94

Dirt

0.92 to 0.96