A solid epoxy composition comprising: a high heat epoxy compound of one or more of formulas (I) to (IX): and wherein R 1 and R 2 at each occurrence are each independently an epoxide-containing functional group; R a and R b at each occurrence are each independently halogen, C 1 -C 12 alkyl, C 2 -C 12 alkenyl, C 3 -C 8 cycloalkyl, or C 1 -C 12 alkoxy; p and q at each occurrence are each independently 0 to 4; R 13 at each occurrence is independently a halogen or a C 1 -C 6 alkyl group; c at each occurrence is independently 0 to 4; R 14 at each occurrence is independently a C 1 -C 6 alkyl, phenyl, or phenyl substituted with up to five halogens or C 1 -C 6 alkyl groups; R g at each occurrence is independently C 1 -C 12 alkyl or halogen, or two R g groups together with the carbon atoms to which they are attached form a four-, five-, or six-membered cycloalkyl group; t is 0 to 10; and the high heat epoxy compound has a melting point greater than 100°C; and an amorphous epoxy compound, wherein the solid epoxy composition has a single glass transition temperature from 35 to 100°C, preferably from 40 to 95°C, measured as per ASTM D3418, and wherein the solid epoxy composition exhibits no other glass transition temperature or crystalline melting point from -20 to 200°C. a high heat epoxy compound of one or more of formulas (I) to (IX): and wherein R 1 and R 2 at each occurrence are each independently an epoxide-containing functional group; R a and R b at each occurrence are each independently halogen, C 1 -C 12 alkyl, C 2 -C 12 alkenyl, C 3 -C 8 cycloalkyl, or C 1 -C 12 alkoxy; p and q at each occurrence are each independently 0 to 4; R 13 at each occurrence is independently a halogen or a C 1 -C 6 alkyl group; c at each occurrence is independently 0 to 4; R 14 at each occurrence is independently a C 1 -C 6 alkyl, phenyl, or phenyl substituted with up to five halogens or C 1 -C 6 alkyl groups; R g at each occurrence is independently C 1 -C 12 alkyl or halogen, or two R g groups together with the carbon atoms to which they are attached form a four-, five-, or six-membered cycloalkyl group; t is 0 to 10; and the high heat epoxy compound has a melting point greater than 100°C; and R 1 and R 2 at each occurrence are each independently an epoxide-containing functional group; R a and R b at each occurrence are each independently halogen, C 1 -C 12 alkyl, C 2 -C 12 alkenyl, C 3 -C 8 cycloalkyl, or C 1 -C 12 alkoxy; p and q at each occurrence are each independently 0 to 4; R 13 at each occurrence is independently a halogen or a C 1 -C 6 alkyl group; c at each occurrence is independently 0 to 4; R 14 at each occurrence is independently a C 1 -C 6 alkyl, phenyl, or phenyl substituted with up to five halogens or C 1 -C 6 alkyl groups; R g at each occurrence is independently C 1 -C 12 alkyl or halogen, or two R g groups together with the carbon atoms to which they are attached form a four-, five-, or six-membered cycloalkyl group; t is 0 to 10; and the high heat epoxy compound has a melting point greater than 100°C; and an amorphous epoxy compound, wherein the solid epoxy composition has a single glass transition temperature from 35 to 100°C, preferably from 40 to 95°C, measured as per ASTM D3418, and wherein the solid epoxy composition exhibits no other glass transition temperature or crystalline melting point from -20 to 200°C. <EOS>