Standard No.:	GB/T 8658-2025
English Name:	Rubber, raw styrene-butadiene, emulsion-polymerized—Determination of bound styrene content—Refractive index method
Chinese Name:	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
Chinese Classification:	G35    Synthetic rubber
Professional Classification:	GB    National Standard
ICS Classification:	83.040.10 83.040.10    Latex and raw rubber 83.040.10
Source Content Issued by:	SAMR; SAC
Issued on:	2025-8-29
Implemented on:	2026-3-1
Status:	to be valid
Superseding:	GB/T 8658-1998 Rubber, raw styrene-butadiene, emulsion - Polymerized - Determination of bound styrene content-Refractive index method
Target Language:	English
File Format:	PDF
Word Count:	9000 words
Translation Price(USD):	270.0
Delivery:	via email in 1~3 business day

本文件描述了一种测定苯乙烯-丁二烯橡胶(SBR)中结合苯乙烯含量的方法。
本文件适用于测定乳液聚合型SBR中结合苯乙烯含量。若能制得适合折光指数仪测定的薄片，也适用于经抽提过的乳液聚合型充油SBR。
本文件不适用于溶液聚合型SBR。