Any epoxy resin would (theocratically) work (with a suitable hardener i.e., amine/anhydride type) either at ambient temperature at an elevated temperature according to your choice.
I agree with the above answer and the most important and critical thing is the manufacturing of the coconut shell reinforced epoxy composite. In which, you have to make the composite by attaching the layer of epoxy on the coconut shell. Please carefully prepare setup and manufacturing and keep in mind that no air is trapped between matrix and the reinforced because this will directly affect the mechanical and all the other properties of coconut shell epoxy composite. For more information you can refer to my article added in m,y profile.
Yes, Epoxy resin matrix is used as a polymeric base matrix material. Coconut shell powder is reinforced in the epoxy matrix. You can mix the powder in the matrix itself. Pour the mixture in a wood mold.