It is mandatory to opt for a biodegradable material if the urn is to be placed in the ground or in the open sea: clay, peat, natural fibers, sand, wood, these materials of natural origin allow decomposition that respects the environment. and perpetuate the ecological spirit of the missing person.
If the urn is kept in a dedicated space (cave or columbarium niche, burial in a funeral monument), other materials can be considered: granite, alabaster, brass, porcelain, but also glass, which are materials resistant to water. humidity and durable over time.
Urns intended to be sealed on a funeral monument must be very strong and resistant to frost.