Different between rubber stopper

What is a different between grey bromo butyl rubber stopper and grey butyl rubber stopper?

Bromo butyl rubbers typically have lower levels of extractables compared to butyl rubbers, and excellent resistance to permeation by water and oxygen. Bromo butyl is used as base, Other additives are fillers, vulcanizing agents, antioxidants, pigments, etc.Having the right base rubber, but not having the right additives for the full formulation, will result in poor performance. Having the right formulation, and understanding the needs of the drug product, such as compatibility and long-term stability with the formulation, will help to achieve high performance.

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