Epoxy reactive diluents is a type of low-viscosity epoxy resin that is used to reduce the viscosity of high-viscosity epoxy resins. It is a reactive diluent, which means that it is able to react chemically with the epoxy resin to form a cross-linked network. Reactive diluent is commonly used to improve the handling and processing characteristics of high-viscosity epoxy resins, making them easier to mix, pour, and apply. It is also able to improve the mechanical and chemical properties of the cured epoxy resin, such as its flexibility, impact resistance, and adhesion. It is commonly used in a variety of applications, such as coatings, adhesives, and composites. A non-reactive diluent would be a solvent or plasticizer.