From Longman Dictionary of Contemporary Englishscrap paperˈscrap ˌpaper noun [uncountable] DHpaper, often paper that has already been used on one side, that you use for making notes, lists etc
Examples from the Corpus
scrap paper• Staff have been told to use stocks of old stationery as scrap paper.• Her official stationery is now being used as scrap paper in the royal mail.• Everything -; right down to scrap paper from the waste baskets. 