不干胶 is a noun meaning 'adhesive sticker' or 'self-adhesive label' — literally 'not-dry glue'. It refers to the backing paper with adhesive that allows stickers and labels to be peeled and stuck onto surfaces. In everyday life, 不干胶 appears in contexts like 不干胶标签 (sticky labels) and 不干胶贴纸 (self-adhesive stickers). There is no grammatical splitting or separable-verb pattern to worry about; it is a straightforward compound noun.