The HT25 from Dutch Microwave Absorber Solutions (DMAS) is an EMC Closed-Cell, Carbon-Loaded Polystyrene Absorber for use in semi-anechoic chambers. It operates in a frequency range from 10 MHz to 40 GHz and provides superior electromagnetic absorption when combined with matching ferrite tiles. This absorber has a modular design consisting of 128 pyramid tapers of a total height of 250 mm on a 1200 mm × 600 mm × 50 mm baseplate. It allows for easy installation and replacement, using plastic mounting strips and screws without the need for adhesives. The HT25 complies with international standards, including REACH, RoHS, ISO 9001, and ISO 14001, ensuring both environmental safety and high-quality manufacturing.  

The HT25 is ideal for validating EMC chambers and is suited for radiated immunity testing and complies with ISO 11925-2 class E, ISO 4589-2, UL94-HBF standards. It is designed to work in combination with ferrite floor absorbers, enhancing performance for full compliance testing. This absorber has a closed-cell structure that prevents carbon particle leakage, maintaining a clean testing environment. White end caps are available to protect the absorber tips and improve light reflection inside the chamber.