astra77Company Aster-77, History, 2025 EMC increases to 90% stake in Astra-77, 2022 EMC buys Astra-77, Notesastra®-mt77-pcb-fabrication. Astra® MT77 PCB Fabrication. Astra® MT77 materials are a breakthrough, very low-loss dielectric constant (Dk) product for millimeter wave