When sealant adheres to the bottom of the crack as well as the two sidewalls, the material has no room to stretch or compress. As the concrete expands with heat or contracts with cold, the sealant tears apart. Devfoam acts as a bond breaker. By filling the lower portion of the crack or joint, Devfoam ensures the sealant only adheres to the two vertical sidewalls, allowing it to flex in an hourglass shape to accommodate movement.
I used Devfoam for crack filling in a concrete wall. Application was straightforward with the included nozzle. The foam expanded as expected and adhered well to dry, clean surfaces. devfoam crack work
Devfoam is primarily used in CNC machining. While the material machines beautifully, improper tooling or feed rates can generate excessive friction heat. Although thermosetting, the coefficient of thermal expansion for polyurethane is significant. If a cutting tool heats a localized area too quickly, that area expands. When it cools, it contracts. This rapid expansion and contraction cycle creates shear stresses between the machined surface and the cooler core, leading to surface checks and deeper fissures. When sealant adheres to the bottom of the