Optically obvious. No wires or tints. Comprised of 2 tempered lites Using the cavity full of a clear fire retardant.
Fire rated partitions are analyzed to ASTM E119 / UL 263 / CAN/ULC S101, the stringent fire resistive https://saadkxuv371182.bloggazza.com/29307874/rumored-buzz-on-fire-resistant-glass