Fire efficiency isn't just the core; brace alloys, screw qualities, and coating systems all impact ratings

https://www.scribd.com/document/1042029003/The-Heritage-of-Hand-Fabricated-Metal-Customized-Leader-Boxes-Designed-to-Endure-a-Century-198695

Fire efficiency isn't just the core; bracket alloys, screw qualities, and coating systems all impact scores, so assemblies are tested together for real-world compliance.