A thermosettable epoxy resin composition comprising a residual oligomeric product; wherein the residual oligomeric product comprises a polyfunctional aliphatic or cycloaliphatic epoxy resin which has been isolated from an epoxy resin product formed as a result of an epoxidation process comprising the reaction of (i) an aliphatic or cycloaliphatic hydroxyl-containing material; (ii) an epihalohydrin; (iii) a basic-acting substance; (iv) a non-Lewis acid catalyst; and (v) optionally, one or more solvents; wherein the polyfunctional aliphatic or cycloaliphatic epoxy resin comprises multiple geometrical isomers of: 2-propanol, 1-(oxiranylmethoxy)-3-[[3(or 4)-[(oxiranylmethoxy)methyl]cyclohexyl]methoxy]-; oxirane, 2-[[2-chloro-1-[[[3(or 4)-[(oxiranylmethoxy)methyl]cyclohexyl]methoxy]methyl]ethoxy]methyl]-; oxirane, 2-[[[3(or 4)-[[2,3-bis(oxiranylmethoxy)propoxy]methyl]cyclohexyl]methoxy]methyl]-; cyclohexanemethanol, 3(or 4)-[[2-hydroxy-3-[[3(or 4)-[(oxiranyl-methoxy)methyl]cyclohexyl]methoxy]propoxy]methyl]-; 2-propanol, 1,3-bis[[3(or 4)-[(oxiranylmethoxy)methyl]cyclohexyl]methoxy]-; oxirane, 2-[[2-[[3(or 4)-[(oxiranylmethoxy)methyl]cyclohexyl]methoxy]-1-[[[3(or 4)-[(oxiranylmethoxy)methyl]cyclohexyl]methoxy]methyl]ethoxy]methyl]-; and less than 20 % by weight diglycidyl ethers of cis-, trans-1,3- and 1,4-cyclohexanedimethanols; an epoxy curing material comprising (i) an epoxy resin curing agent; (ii) an epoxy resin curing catalyst; or (iii) both (i) and (ii); and optionally, an epoxy resin compound other than the polyfunctional aliphatic or cycloaliphatic epoxy resin. a residual oligomeric product; wherein the residual oligomeric product comprises a polyfunctional aliphatic or cycloaliphatic epoxy resin which has been isolated from an epoxy resin product formed as a result of an epoxidation process comprising the reaction of (i) an aliphatic or cycloaliphatic hydroxyl-containing material; (ii) an epihalohydrin; (iii) a basic-acting substance; (iv) a non-Lewis acid catalyst; and (v) optionally, one or more solvents; wherein the polyfunctional aliphatic or cycloaliphatic epoxy resin comprises multiple geometrical isomers of: 2-propanol, 1-(oxiranylmethoxy)-3-[[3(or 4)-[(oxiranylmethoxy)methyl]cyclohexyl]methoxy]-; oxirane, 2-[[2-chloro-1-[[[3(or 4)-[(oxiranylmethoxy)methyl]cyclohexyl]methoxy]methyl]ethoxy]methyl]-; oxirane, 2-[[[3(or 4)-[[2,3-bis(oxiranylmethoxy)propoxy]methyl]cyclohexyl]methoxy]methyl]-; cyclohexanemethanol, 3(or 4)-[[2-hydroxy-3-[[3(or 4)-[(oxiranyl-methoxy)methyl]cyclohexyl]methoxy]propoxy]methyl]-; 2-propanol, 1,3-bis[[3(or 4)-[(oxiranylmethoxy)methyl]cyclohexyl]methoxy]-; oxirane, 2-[[2-[[3(or 4)-[(oxiranylmethoxy)methyl]cyclohexyl]methoxy]-1-[[[3(or 4)-[(oxiranylmethoxy)methyl]cyclohexyl]methoxy]methyl]ethoxy]methyl]-; and less than 20 % by weight diglycidyl ethers of cis-, trans-1,3- and 1,4-cyclohexanedimethanols; (i) an aliphatic or cycloaliphatic hydroxyl-containing material; (ii) an epihalohydrin; (iii) a basic-acting substance; (iv) a non-Lewis acid catalyst; and (v) optionally, one or more solvents; 2-propanol, 1-(oxiranylmethoxy)-3-[[3(or 4)-[(oxiranylmethoxy)methyl]cyclohexyl]methoxy]-; oxirane, 2-[[2-chloro-1-[[[3(or 4)-[(oxiranylmethoxy)methyl]cyclohexyl]methoxy]methyl]ethoxy]methyl]-; oxirane, 2-[[[3(or 4)-[[2,3-bis(oxiranylmethoxy)propoxy]methyl]cyclohexyl]methoxy]methyl]-; cyclohexanemethanol, 3(or 4)-[[2-hydroxy-3-[[3(or 4)-[(oxiranyl-methoxy)methyl]cyclohexyl]methoxy]propoxy]methyl]-; 2-propanol, 1,3-bis[[3(or 4)-[(oxiranylmethoxy)methyl]cyclohexyl]methoxy]-; oxirane, 2-[[2-[[3(or 4)-[(oxiranylmethoxy)methyl]cyclohexyl]methoxy]-1-[[[3(or 4)-[(oxiranylmethoxy)methyl]cyclohexyl]methoxy]methyl]ethoxy]methyl]-; and less than 20 % by weight diglycidyl ethers of cis-, trans-1,3- and 1,4-cyclohexanedimethanols; an epoxy curing material comprising (i) an epoxy resin curing agent; (ii) an epoxy resin curing catalyst; or (iii) both (i) and (ii); and (i) an epoxy resin curing agent; (ii) an epoxy resin curing catalyst; or (iii) both (i) and (ii); and optionally, an epoxy resin compound other than the polyfunctional aliphatic or cycloaliphatic epoxy resin.