https://phys.org/news/2018-07-nasa-developed-coating-smithsonian-specimens.html

Made of zeolite, a mineral widely used in water purification, and a colloidal silica that acts as a glue, MAC is highly permeable and porous—attributes that allow it to trap contaminants that outgas in a process similar to what creates the new car smell in vehicles. Because it doesn't contain volatile organics, the coating itself doesn't cause additional outgassing. Easy to use, the coating can be applied directly to the hardware itself or on varying-sized panels that are inserted inside instrument cavities and test chambers.

Target Contamination: Mercury Vapor