Thermophysical Properties Research Laboratory, Inc.
Phone : 765-463-1581
The emissivity of a material is the relative ability of its surface to emit energy by radiation.
It is the ratio of energy radiated by a particular material to energy radiated by a black body at
the same temperature. A true black body would have an emissivity of 1 while any real object would
have an emissivity less than 1. Emissivity is a dimensionless quantity.
TPRL, Inc. has two methods of measuring emissivity: the
(ASTM C835-06) multi-property apparatus and the
table top emissivity apparatus.
The multi-property apparatus is used for conducting
solids at high temperatures (up to the melting point of the material).
The table top emissivity apparatus is used at
lower temperatures (40°C to 200°C).
Still not sure what is the best testing method for your material? Use our
Testing Method Selector Tool to help you decide.
Copyright 2011 TPRL, Inc.
3080 Kent Avenue
West Lafayette, IN 47906
Last updated 1/5/2012