Cyanate ester is a thermoset material with a very low glass-transition temperature due in part to its low moisture uptake.
The result is a thermoset material with a very high glass-transition temperature (Tg) of up to 400 C, and a very low dielectric constant, providing excellent long term thermal stability at elevated end use temperatures, very good fire, smoke and toxicity performance and specific suitability for printed circuit boards installed in critical electrical devices. 
