4100NS is a high solids superior performance elastomeric latex caulk. It is used in most common firestop applications from 1, 2, 3 and 4-hour rated assemblies but is predominately used in construction joints where it provides ease of installation and cures to a flexible finish. 4100NS gives superior adhesion to similar and dissimilar substrates in vertical, horizontal and top of wall construction joints. This coulk will also provide a tight bond when used on most construction materials such as, metallic pipe, conduit, electrical wires and cables (jacketed and bare), cable trays, plastics, metal ducts, gypsum wallboard, wood and concrete.