Strict regulations apply to urns used for sea burials. They must be completely biodegradable and must not release any harmful substances into the sea.
Legal Requirements
Sea urns must meet the following requirements:
- Completely water-soluble: The urn must dissolve in water.
- Biodegradable: All materials must be naturally decomposable.
- No harmful substances: No substances may be released into the water that burden the environment.
Approved Materials
The following materials are approved for sea urns:
- Compressed sandstone: Natural sandstone that slowly dissolves in water.
- Natural salts: Salt urns dissolve relatively quickly.
- Clay and ceramics (untreated): Unglazed, unfired clay dissolves in water. Handmade clay urns are common.
- Cellulose: Plant fiber materials that biodegrade.
- Bio-composites: Special materials developed specifically for sea burials.
Prohibited Materials
The following materials are not permitted for sea urns:
- Metal
- Plastic
- Lacquer and paint
- Glaze
- Treated or lacquered wood
Dissolution Process
After the burial, the urn sinks to the seabed. There, the natural dissolution process begins:
- Duration: Depending on material, between about 20 minutes and several days.
- Salt urns: Dissolve fastest (approx. 20–60 minutes).
- Clay urns: Require several hours to days.
- Sandstone urns: Dissolve completely over several days.
After dissolution, the ash remains are completely absorbed by the water and returned to the natural cycle.
Urn Design
Despite the material requirements, sea urns come in various shapes and designs:
- Classic round urn shapes
- Shell-shaped urns
- Individually designed handmade urns
- Urns with incorporated natural motifs (e.g., waves, seagulls)
The design can be personalized within the permitted materials. Funeral companies typically offer a selection of urns.
Further Information
- Environmental Aspects – Ecological benefits of sea burial
- Sea Burial Process – The day of the ceremony
- Legal Requirements – Documents and permits