I was not expecting Sellotape to make me ponder the definition of “plastic” today. But my departmental stationary cupboard has “zero plastic sellotape” (similar to Scotch tape, if you’re from the USA).
Plant-based things can be made non-biodegradable, bamboo fabric being the obvious eg - it’s rayon, which contribute to plastic marine waste & doesn’t decompose. And this “zero-plastic” tape will only compost in an industrial composter.
If it looks like plastic and quacks like plastic…
#plastic