The MT45-JT from Comtest is a polystyrene microwave absorber that operates from 500 MHz to 40 GHz. This absorber has superior rigidity and tensile strength and is compliant with all necessary fire retardant standards without the use of hazardous materials and is highly resilient to humidity and changes in ambient temperature. It is 40% lighter than foam and is certified for use in clean rooms (class 10.000 / ISO14644-1 class 4). This absorber has a lifetime of more than 40 years and comes with a 25 year warranty.