What's the plural form of macroplastic? Here's the word you're looking for.
Answer
The noun macroplastic can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be macroplastic.
However, in more specific contexts, the plural form can also be macroplastics e.g. in reference to various types of macroplastics
or a collection of macroplastics.