What materials and features are commonly used in clean room ceiling grids?

Cleanroom ceiling grids are often constructed from extruded aluminum for corrosion resistance and non-magnetic properties, or steel for added durability. Key features include integral gaskets (such as closed-cell PVC foam) to prevent air leakage, suspension via threaded rods, turnbuckles, or wires for precise adjustment, and compatibility with HEPA filters and vinyl-faced tiles. Some systems, like walkable grids, allow easy access to overhead systems, and they meet standards like Federal Standard 209E and ISO classifications for classes ranging from 10 to 100,000.