In the international standard classification, g+ urea involves: .
BE-NBN, g+ urea
NBN T 04-305-1983 Urea for industrial use - Measurement of the pH of a solution of urea of conventional concentration (100 g/1) - Potentiometric method
TR-TSE, g+ urea
TS 1932-1975 UREA FOR INDUSTRIAL USE - MEASUREMENT OF THE pH OF A SOLUTION OF UREA OF CONVENTIONAL CONCENTRATION (100 g/l) — POTENTIOMETRIC METHOD
International Organization for Standardization (ISO), g+ urea
ISO 2749:1973 Urea for industrial use; Measurement of the pH of a solution of urea of conventional concentration (100 g/l); Potentiometric method