The total emissivity for metals non metals and common building materials are given.
Emissivity of plastic sheet.
The emissivity coefficient ε indicates the radiation of heat from a grey body according the stefan boltzmann law compared with the radiation of heat from a ideal black body with the emissivity coefficient ε 1.
Note that the emissivity coefficients for some products varies with the temperature.
For example a plastic material with emissivity 0 92 has reflectivity 0 08.
Emitted energy indicates the temperature of the object.
A polished aluminum surface with emissivity 0 12 has reflectivity 0 88.
Emissivity can have a value from 0 shiny mirror to 1 0 blackbody.
If reflectivity increases emissivity must decrease.
For example if an object had the potential to emit 100 units of energy but only emits 90 units in the real world then that object would have an emissivity.
Black plastic 0 95 enamel 0 90 formica 0 93 frozen soil 0 93 glass 0 92 glass frosted 0 96 gold polished 0 02 ice 0 97 iron hot rolled 0 77 iron oxidized 0 74 iron sheet galvanized burnished 0 23 iron sheet galvanized oxidized 0 28 iron shiny.
Additionally thin sheets of material such as plastics may be semi transparent in the infrared and therefore have reduced emissivity.
The emissive and reflective behavior of most materials is similar in the visible and infrared regions of the electromagnetic spectrum.
To optimize the surface temperature measurement of a material.
A range of emissivity values is usually given for many materials whose emissivity can be affected by surface roughness or finish.
Emissivity values of common materials material emissivity aluminum polished 0 05.
Surface contamination such as dust oil films or other agents will affect the actual emissivity of your material.
A black body is a material that is a perfect emitter of heat energy and has an emissivity value of 1.
The emissivity information was determined under ideal conditions.
Additionally thin sheets of material such as plastics may be semi transparent in the infrared and therefore have reduced emissivity.
A diversity of applications from electrical inspections thermal environmental studies to building roof thermography ir refractory evaluations to inspecting mechanical systems process monitoring and control to equine thermography horse thermography infrared condition monitoring to non destructive testing to research and development from security and surveillance to building diagnostics.
A material with an emissivity value of 0 would be considered a perfect thermal mirror.
A range of emissivity values is usually given for many materials whose emissivity can be affected by surface roughness or finish.
Need the emissivity of different and specific materials.
Emissivity is the measure of an object s ability to emit infrared energy.
To optimize the surface temperature measurement of a material.
Most organic painted or oxidized surfaces have emissivity values close to 0 95.
