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10
Emissivity
Most.(90%.of.typical.applications).organic.materials.and.painted.or.
oxidized.surfaces.have.an.emissivity.of.0.95.(pre-set.in.the.instrument)..
Inaccurate.readings.will.result.from.measuring.shiny.or.polished.metal.
surfaces..To.compensate,.cover.the.surface.to.be.measured.with.mask-
ing.tape.or.flat.black.paint..Allow.time.for.the.tape.to.reach.the.same.
temperature.as.the.material.underneath.it..Measure.the.temperature.of.the.
tape.or.painted.surface.
Emissivity Values
Substance
Thermal..
Emissivity
Substance
Thermal..
Emissivity
Asphalt.
0.90.to.0.98
Cloth.(black)
0.98
Concrete.
0.94
Human.skin
.0.98
Cement.
0.96
Leather.
0.75.to.0.80
Sand.
0.90
Charcoal.(powder)
0.96
Earth.
0.92.to.0.96
Lacquer.
0.80.to.0.95
Water.
0.92.to.0.96
Lacquer.(matt)
0.97
Ice.
0.96.to.0.98
Rubber.(black)
0.94
Snow.
0.83
Plastic.
0.85.to.0.95
Glass.
0.90.to.0.95
Timber.
0.90
Ceramic.
0.90.to.0.94
Paper.
0.70.to.0.94
Marble.
0.94
Chromium.oxides
0.81
Plaster.
0.80.to.0.90
Copper.oxides.
0.78
Mortar.
0.89.to.0.91
Lron.oxides.
0.78.to.0.82
Brick.
0.93.to.0.96
Textiles.
0.90
