PYREX® Micro-Electro™ Glass is a semicon-grade borosilicate material for MEMS and sensor packaging made by CORNING®. Its thermal expansion closely matches silicon, allowing reliable anodic bonding, while low thickness variation, minimal warp, and a pristine, optical-grade surface eliminate additional polishing requirements for many applications. Präzisions Glas & Optik GmbH supplies windows, substrates, and wafers in standard thicknesses of 0.5, 0.7, and 1.1 mm for MEMS devices, pressure sensors, and optical sensors.