... 3. Ash conten : 0.02 Wt% 4.Color: 17# or 18# Dark Color Hydrocarbon Resin C91;Purity: 100%2.Softening Point: 97-1153 ... . Ash conten : 0.02 Wt%4.Color: 17# or ... , antioxidant, waterproof, thermal stability, acid and alkali chemical stability.Deep color resin is commonly used as rubber softener, rubber additive, and is ...