万能胶，又称AA胶、快干胶、三秒胶、瞬间胶、502胶，所含作为组合剂的成分为氰基丙烯酸酯（Cyanoacrylate）。氰基丙烯酸酯是一系列物质的合称，譬如 2-氰基丙烯酸甲酯（Methyl-2-cyanoacrylate，CH₂=C(CN)COOCH₃）。其中常见品牌有AA超能胶（Aron Alpha）、强力胶（Superglue）、疯狂快干胶（Crazy glue）等。医用胶如多抹棒（Dermabond）及Traumaseal则含有2-氰基丙烯酸辛酯（2-octyl cyanoacrylate）。氰基丙烯酸酯胶黏剂也称为"立即胶黏剂"。

Cyanoacrylates are a family of strong fast-acting adhesives with industrial, medical, and household uses. Cyanoacrylate adhesives have a short shelf life if not used, about one year from manufacture if unopened, one month once opened. They have some minor toxicity.