Iranian firms are interested in cooperating with the Russian petrochemicals firm Sibur, TASS quoted participants of RosIranNeftekhim-2015 international conference as saying. A representative of Tabriz Petrochemical Company said that it plans to offer Sibur a partnership in rubber and polymer sales. Head of Solar firm said that Sibur used to cooperate with Iranian companies but it was forced to scale down cooperation because of anti-Iran sanctions.