Home / Standards / GB/T 8658-2025 GB/T 8658-2025 Active Rubber, raw styrene-butadiene, emulsion-polymerized—Determination of bound styrene content—Refractive index method 乳液聚合型苯乙烯-丁二烯橡胶生胶 结合苯乙烯含量的测定 折光指数法 Standard Type GBT ICS 83.040.10 CCS G35 Status 现行 Issue Date 2025-08-29 Implementation 2026-03-01 Responsible Dept 中国石油和化学工业联合会 Drafting Unit N/A