Screen Shot of Webpage

Santa Cruz CA, USA — As part of the IR Education section, the Raytek Corporation website contains some useful and well-presented information on Spectral Emissivity, one of the few instrument makers who do so.

Although they just call it plain “emissivity” they then present values for three or four different wavebands, according to the table viewed, “A Rose by any other name…”. There are two pages with disclaimers.

Here’s a summary of the opening statements and links to the actual data pages.

Emissivity of Most Common Materials

“Emissivity is the measure of an object’s ability to emit infrared energy. Emitted energy indicates the temperature of the object. Emissivity can have a value from 0 (shiny mirror) to 1.0 (blackbody). Most organic, painted, or oxidized surfaces have emissivity values close to 0.95. Majority of Raytek sensors have adjustable emissivity feature to ensure accuracy when measuring other materials such as shiny metals.


Raytek, founded in 1963, designs, manufactures, markets and services a complete line of infrared, noncontact temperature measurement instruments for industrial, process control and maintenance applications. In addition to their worldwide headquarters in Santa Cruz, California USA, European headquarters in Berlin, Germany and their China headquarters in Beijing, China, Raytek has regional offices around the globe and is represented by a worldwide network of authorized distributors. Raytek is a Fluke Company.

In 2007, Ircon ( joined Raytek to offer a complete IR solution to their customers.

Raytek Corporation
1201 Shaffer Road
Santa Cruz, CA
95061 USA

Tel: 800 227 8074 (US & Canada) or +1 831 458 3900
Fax: +1 831 425 4561

Raytek GmbH
Blankenburger Straße 135
D-13127 Berlin

Tel: +49 30 4780080
Fax: +49 30 4710251

Raytek China Company
SCITE Tower, Room 1901
22 Jianguomen Wai Dajie
Beijing 100004

Tel: +86 10 6438 4691
Fax: +86 10 6512 3437

Fluke Japan Office
Shinagawa Intercity Building B 6th Floor
2-15-2 Konan, Minato-ku
Tokyo 108-6106

Tel: +81 3 6714 3114
Fax: +81 3 6714 3115