There will be a film, with an adhesive.
Film: The film should be something that is biodegradable. Here is some general information:
(1) Aromatic polyesters are almost totally resistant to microbial attack; most aliphatic polyesters are biodegradable due to their potentially hydrolyzable ester bonds
Naturally-produced products include polyhydroxyalkanoates (PHAs) like poly-3-hydroxybutyrate (PHB), polyhydroxyvalerate (PHV), and polyhydroxyhexanoate (PHH).
Renewable resource: polylactic[收起]