3815909088
- Reaction initiators, reaction accelerators and catalytic preparations, not elsewhere specified or included
- Other
- Other
- Catalyst, consisting of titanium tetrachloride and magnesium chloride, containing by weight on an oil- and hexane-free basis: - 4 % or more but not more than 10 % of titanium and - 10 % or more but not more than 20 % magnesium