Home / Standards / GB/T 2999-2025 GB/T 2999-2025 Active Refractory materials—Determination of bulk density of granular materials 耐火材料 颗粒体积密度试验方法 Standard Type GBT ICS 81.080 CCS Q40 Status 现行 Issue Date 2025-08-01 Implementation 2026-02-01 Responsible Dept 国家标准委 Drafting Unit N/A