ÖNORM EN 821-2

This Part of EN 821 specifies a method for the determination of thermal diffusivity of advanced monolithic technical ceramics, to an acairacy of approximately i 5 % . It is suitable for the measurement of thermal diffusivity values in the range 0,l mm2/s to 1000 mm2/s at temperatures greater than - 180 "C. Annex A gives the mathematical derivation of the calculations, and Annex B contains instniction on actions necessary when the calculations cannot be made in the usual way. NOTE 1 : It is not advisable to exceed the temperature at which the test piece was manufactured. NOTE 2 : This method involves the use of a high powered pulsed laser System or high energy photoflash equipment as well as high vacuum and high temperature furnace capability. Such equipment therefore should be operated within established safety procedures. See EN 60825.