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Epoxy resins and epoxy adhesives are non-toxic in themselves, but due to the addition of solvents and other toxic substances during their production, many epoxy resins become \"toxic\" as a result. In recent years, the epoxy resin industry in China has been working to maintain the non-toxic nature of these materials by using water-based formulations and avoiding the use of such toxic substances. https://t10.baidu.com/it/u=3545820951,870468663&fm=170&s=543686752F0D6F7016941D6E0300E070&w=220&h=144&img.JPEG At present, the vast majority of epoxy resin coatings are solvent-based coatings that contain large amounts of volatile organic compounds (VOCs); they are toxic and flammable, thus posing hazards to the environment and human health. Epoxy resins are generally used together with additives to achieve practical value. Additives can be selected according to different uses; the common types of additives include the following: (1) Curing agents ； (2) Modifiers ； (3) Filler ； (4) Diluent ； (5) Others. Among them, a curing agent is an essential additive; it is required in adhesives, coatings, and castables alike, as without it the epoxy resin cannot cure. Due to the varying performance requirements for different applications, there are also different demands for epoxy resins as well as additives such as curing agents, modifiers, fillers, and diluents. The methods for selecting them are briefly described as follows: (1) Selection of epoxy resins 1. For use as adhesives, it is best to choose resins with a moderate epoxy value (0.25–0.45), such as 6101 and 634 ； When used as a casting material, it is best to choose resins with a high epoxy value (>0.40), such as 618 and 6101 ； For use as a coating, those with a low epoxy value are generally preferred