Greater molecular bodyweight diglycidyl ethers (n ≥ 1) are fashioned by the reaction on the bisphenol A diglycidyl ether formed with further bisphenol A, this known as prepolymerization: An aromatic epoxy also includes a “ring” in just its chemical composition which is a product of BPA and epichlorohydrin reacting together. https://www.propanraya.com/id/produk/epoxy-fast-dry