When playing on a server with polymer, it is hard to know all the available items and their recipes. I saw it is compatible with JEI, but none of the modded item show up in the items list when in the inventory.

Is any compatibility possible from polymer side?

You need to install polymer on the client. Through myself I recommend using EMI

That's the issue : the mod is also installed client side :

i'll give a try to EMI

Edit : EMI is fine