The maximum operating temperature for an ORMOCER®-coated DTG® is about 200°C. During high temperature exposure, the reflectivity of the DTG® will be slightly reduced but also stabilized. Depending on the type of measurement, FBGS recommends a pre-annealing process to increase the stability of the grating wavelength. For applications at >200°C, please contact us at info@fbgs.com for more information.