Heading 3911
Petroleum resins, coumarone-indene resins, polyterpenes, polysulphides, polysulphones and similar products of chemical synthesis n.e.c. in chapter 39, in primary forms
391110
Petroleum resins, coumarone, indene or coumarone-indene resins and polyterpenes; in primary forms
391120
Petroleum resins, poly(1,3-phenylene methylphosphonate), in primary forms
391190
Polysulphides, polysulphones and similar products of chemical synthesis n.e.c. in chapter 39; in primary forms