In the international standard classification, Crotonyl involves: Fertilizers.
German Institute for Standardization, Crotonyl
DIN EN 17864:2022-08 Inorganic fertilizers - Determination of nitrogen content in IBDU (isobutylidenediurea) and CDU (crotonylidenediurea); German and English version prEN 17864:2022 / Note: Date of issue 2022-07-01*Intended as replacement for DIN EN 15705 (2010-07).
British Standards Institution (BSI), Crotonyl
22/30453271 DC BS EN 17864. Inorganic fertilizers. Determination of nitrogen content in IBDU (isobutylidenediurea) and CDU (crotonylidenediurea)
14/30313913 DC BS ISO 25705. Fertilizers. Determination of urea condensates using high-performance liquid chromatography (HPLC). Isobutylidenediurea and crotonylidenediurea (method A) and methylen-urea oligomers (method B)