Causes Of Expansion Of Epoxy Resin Sleeve Due To Long-term Contact With Medium

In industrial piping systems, epoxy resin cast bushing is used as a protective layer and may exhibit dimensional changes when in long-term contact with the transported medium. Polymer materials such as epoxy resins absorb medium molecules and undergo volume changes upon contact with certain liquids or chemicals. Cured epoxy resins absorb molecules in hygroscopic or solvent-rich environments, causing internal structural expansion and a slight increase in volume.

Pipe media may contain components of varying polarity or solvents. When these components penetrate the molecular network of epoxy bushing manufacturer, the polymer chain spacing increases, resulting in an expansion effect. The absorption capacity of a material is closely related to the resin's chemical composition, degree of curing, crosslinking density, and medium properties. Highly polar or small molecule media can penetrate resin networks more easily, and epoxy bushing for transformer will cause significant volume changes.