C9 Hydrocarbon hars SHM-299 Series is C9 fraksje as in byprodukt fan petroleum cracking en in thermoplastic hars produsearre troch distillation, polymerization en oare processes.It is oligomer molekulêre gewicht tusken 300-3000 en is gjin polymer.This is ljocht giel oant donkerbrún granule of flak fêst.