This International Standard specifies a method for the determination of the styrene content of all types of
styrene-butadiene rubber (SBR), including oil-extended types.
The method is applicable to styrene-butadiene rubbers reinforced with styrene homopolymer, to give the total
styrene content. The method is also applicable for determining the styrene in block copolymers containing up
to 50 % (by mass) of styrene.
It is applicable to vulcanizates of mixtures of SBR with other polymers (NR, BR, IR and CR) and is considered
a method for estimating the SBR content of mixtures, if the styrene content of the SBR is known and provided
that no other styrene-containing materials are present.
Any other non-extractable aromatic material which absorbs in the specified spectral region will interfere with
The procedure may give low results when the content of mineral fillers insoluble in nitric acid exceeds 5 % (by mass).