Home / Standards / GB/T 6540-2025 GB/T 6540-2025 Active Determination for colour of petroleum products 石油产品颜色的测定 Standard Type GBT ICS 75.080 CCS E30 Status 现行 Issue Date 2025-10-05 Implementation 2026-05-01 Responsible Dept 国家标准委 Drafting Unit N/A