A Continuous Seal Cannot Be Formed Between The Epoxy Resin Sleeve And The Pipe Wall.

Before construction, the cleanliness of the base surface directly affects the adhesion quality between epoxy bushing and the steel pipe wall. If residual oxide scale, impurities, or moisture remain inside, the resin cannot form a tight interface with the metal during the curing process, causing localized delamination or even delamination of epoxy resin bushing. Such delamination issues illustrate that material-substrate incompatibility can cause resin separation from the wall surface, resulting in subsequent leakage or peeling.

In addition, the resin curing conditions are also a factor affecting the epoxy resin cast bushing seal. Resin systems have specific flow properties and curing kinetics; thermal expansion or contraction during the curing stage generates internal stress. If there is a significant difference in the coefficients of thermal expansion between the wall material and the epoxy resin, these stresses will accumulate along the interface, causing microcrack propagation and interface weakening.