| |
EMISSIVITY FOR VARIOUS
MATERIALS
| MATERIAL |
EMISSIVITY RANGE
|
IRtec
SELECTION
|
| Aluminum
pure, highly polished plate
oxidized at 600oC
common use plate
|
0,04 – 0,06
0,11 – 0,19
0,09
|
LoE
LoE
LoE
|
| Brass
pure, highly polished plate
oxidized at 600oC
|
0,1
0,61 – 0,59
|
LoE
LoE
|
| Chromium, highly
polished |
0,08 – 0,36
|
LoE
|
| Copper
polished
heated to 600°C
|
0,05
0,57
|
LoE
LoE
|
| Gold, pure, highly
polished |
0,02 – 0,03
|
LoE
|
| Iron and steel (stainless
steel not included)
iron, polished
cast iron, polished
cast iron, oxidized at 600oC
iron, forged, polished
iron, forged, oxidized, matted
iron, rusted plate
steel, polished
steel, oxidized at 600oC
steel, rolled plate
steel, rough plate
|
0,14 – 0,38
0,21
0,64 – 0,78
0,28
0,94
0,69
0,07
0,79
0,66
0,94 – 0,97
|
LoE
LoE
LoE
LoE
HiE
LoE
LoE
LoE
LoE
HiE
|
| Lead, gray oxidized |
0,28
|
LoE
|
| Mercury |
0,09 – 0,12
|
LoE
|
| Molybdenum, filament |
0,10 – 0,20
|
LoE
|
| Nickel
polished
plate, oxidized at 600°C
|
0,07
0,37 – 0,48
|
LoE
LoE
|
| Platinum
pure, polished plate
wire
|
0,05 – 0,10
0,07 – 0,18
|
LoE
LoE
|
| Silver, pure, polished |
0,02 – 0,03
|
LoE
|
| Stainless steel
polished
type 310, furnace oxidized
|
0,07
0,90 – 0,97
|
LoE
HiE
|
| Tin, bright |
0,06
|
LoE
|
| Tungsten, aged filament |
0,03 – 0,35
|
LoE
|
| Zinc
pure, commercial, polished
galvanized plate
|
0,05
0,21
|
LoE
LoE
|
| Asbestos |
0,93 – 0,94
|
HiE
|
| Brick
red, rough
fire clay
|
0,93
0,75
|
HiE
HiE
|
| Carbon
filament
carbon black, rough deposit
|
0,53
0,78 – 0,84
|
HiE
HiE
|
| Glass (Pyrex, lead,
carbonate - containing) |
0,85 – 0,95
|
HiE
|
| Marble, bright grey,
polished |
0,93
|
HiE
|
| Paints, lacquers
white enamel
black lacquer
aluminum-based
oil-based, 16 colours
|
0,91
0,96 – 0,98
0,27 – 0,67
0,92 – 0,96
|
HiE
HiE
LoE
HiE
|
| Porcelain, glazed |
0,92
|
HiE
|
| Quartz, opaque |
0,68 – 0,92
|
HiE
|
| Water |
0,95 – 0,96
|
HiE
|
| Oak wood, smooth |
0,90
|
HiE
|
NOTE: Lower emissivity surfaces
require more stable conditions than those with high emissivity, for an
accurate temperature control.
This table contains approximate
values which can significantly vary depending on the surface status. For
best results, IRtec testing is necessary upon installation.
LoE = reduced emissivity
HiE = high emissivity
|
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