How to Say "binding" in Spanish
The Spanish word for “binding” is “pasta” — B2 level.
English → SpanishB2
nounB2
the material used to bind a book

Examples
Este diccionario tiene una pasta muy dura y resistente.
This dictionary has a very hard and resistant cover.
El libro de texto está disponible en pasta blanda o dura.
The textbook is available in softcover or hardcover.
Regional Preference
Mistake: “Using 'pasta' for 'cover' outside of Spain.”
Correction: In most of Latin America, use 'tapa' or 'cubierta' instead of 'pasta' for a book cover.
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