BS ISO 2322:2023

Styrene-butadiene rubber (SBR). Emulsion- and solution-polymerized types. Evaluation procedures. | Status: Current

1 Scope This document specifies:

1. — physical and chemical tests on raw rubbers;
2. — standard materials, standard test formulations, equipment, and processing methods for evaluating the vulcanization characteristics of emulsion- and solution-polymerized styrene-butadiene rubbers (SBRs), including oil-extended rubbers.

It applies to those rubbers listed in Table 1 which are normally used in vulcanized form. Table 1 — Types of raw styrene-butadiene rubber Rubber (oil-extended ornon-oil-extended) Styrene Type of copolymer Total content % mass fraction Block content % mass fraction Series A Emulsion SBR Solution SBR Solution SBR Random Random Partial block ≤50 ≤50 ≤50 0 0 ≤30 Series B Emulsion SBR Solution SBR Solution SBR Random Random Partial block >50 >50 ≤50 0 0 >30