Noun
any of various synthetic elastic materials whose properties resemble natural rubber
Source: WordNetBoth Streaker and Dream Chaser use hybrid rocket motors that burn nitrous oxide and the synthetic rubber HTPB. Source: Internet
Chlorides Aluminium chloride (AlCl 3 ) is used in petroleum refining and in the production of synthetic rubber and polymers. Source: Internet
The remainder is synthetic rubber derived from petrochemical sources. Source: Internet