What's the plural form of retardance? Here's the word you're looking for.
Answer
The noun retardance can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be retardance.
However, in more specific contexts, the plural form can also be retardances e.g. in reference to various types of retardances
or a collection of retardances.
Examples
Levagard and Disflamoil ranges use impregnation and a transparent multi-layer coating system to ensure halogen-free flame retardance.