How many letters does the top answer for “a substance added to plastics or other materials to make them more pliable” have?

The most common answer is plasticiser (11 letters).

Crossword clue: a substance added to plastics or other materials to make them more pliable

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

plasticiser 11 letters wn-def

a substance added to plastics or other materials to make them more pliable

plasticizer 11 letters wn-def

a substance added to plastics or other materials to make them more pliable