Styrene-Butadiene : rubber Old-style synthetic foam rubber; it burns rapidly with dense smoke. Though no longer manufactured in North America, it is still in use
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}