Home / Standards / GB/T 18242-2025 GB/T 18242-2025 Active Styrene butadiene styrene/Atactic polypropylene modified bituminous waterproofing sheets 弹性体/塑性体改性沥青防水卷材 Standard Type GBT ICS 91.120.30 CCS Q17 Status 现行 Issue Date 2025-10-31 Implementation 2026-05-01 Responsible Dept 中国建筑材料联合会 Drafting Unit N/A