Black fiberglass tissue, which is a type of composite material made from glass fibers and a resin matrix, typically exhibits good chemical stability. It is resistant to many chemicals, including alkalis, acids, and salts, making it suitable for various industrial applications. However, it may not be as stable against strong acids or bases over extended periods. The stability can also be influenced by the specific type of resin used in the fiberglass, with some resins offering better resistance to certain chemicals than others. It's important to consult the material data sheet for specific information on chemical resistance for the black fiberglass tissue in question.