SCR Exhaust Treatment Fluid (DEF 32.5%)(SCR尾气净化液)— manufactured by Shandong Huanqiu Lubricant Oil Co., Ltd. High-purity urea solution meeting ISO 22241, produced and bottled in-house.
Specification sheet (as published by the manufacturer):

SCR Emission Control
Base oilSINOPEC · GROUP II–III
Packing1L · 4L · 18L · 200L · IBC
CertificationISO 9001 · 14001 · 45001
TraceabilityBATCH-LEVEL