What is SBR no. or OTC in sss form?
You'll find more information about SSS online registration on this link. Download the PDF file and read the SBR section.
I got 1043 kg/m3 for pure SBR from: http://www.tpl.fpv.ukf.sk/engl_vers/thermophys/2004/Boh-Vre.pdf If I am not mistaken, the density of SBR would vary. It is made up of styrene and butadiene, and depending on the percentage of SBR that they make up the density of SBR would be different. You might want to take this into consideration.